how to apply MK4 upgrade on Bear 2.1

[bgiot]

Hi, it's more a question: I have a bear 2.1 mk3s with bondtech extruder. Will the MK4 upgrade work outofthebox ? Or do I have to comeback to the original frame design and wait for bear 3.0 design ?

[Bob6y]

Hello, so my rails should not have a negative impact during the test, the total course is 225mm. When I run the test, the back side of the hot bed hit the motor holder several times. The he comes step y step to the front and stop. And I have a red cross for this step. The rails bearing do not touch the frame.

I redo the belt assembly with a modification for the front belt holder in order to be able to pass the 20mm bearing axis.

I really don't hunderstand why the "y" test doesn't pass.

[DesC21]

@Bob6y The complete length on the standard bear is 311mm from "end to end". The length of the end of the bearings is about ~95mm. So in total movement of about ~215mm.

And the display on the printer reads max. 215mm (after homeing). What values do you get on the display, 225mm? Maybe it's not about the length but it's the sensitivity of the forces needed to move the bed on the rails or when they hit the ends? I don't know maybe you have to look at the firmware to check what they are checking during the test.

Hello, so my rails should not have a negative impact during the test, the total course is 225mm. When I run the test, the back side of the hot bed hit the motor holder several times. The he comes step y step to the front and stop. And I have a red cross for this step. The rails bearing do not touch the frame.

I redo the belt assembly with a modification for the front belt holder in order to be able to pass the 20mm bearing axis.

I really don't hunderstand why the "y" test doesn't pass.

[PatB42]

I had prob with the X on 1st time but then i install the fmw 5.0 then all passed but there is the 5.1 alpha2 !! and try to loose the belt sometimes to tight then get problem.. if you have the same length as the bed touch the bear from both side then should be ok that why look at the lenght of the hiwin !! did u ask the chatlive !! they will not answer this question for sure..!! but trying still free good luck

[Bob6y]

Thank for your answers. I re initialiazed the printer with the 5.0.0 firmware. And the "y" test duration was longer but it failed at the end... 🤯

I also control the belt tension on the "y" axis.

For length it's OK also I think:

228mm it's the course of the bed and 329mm it's the total length of the rail.

It remains to me to ask prusa support but with a bear frame and rails... It will be difficult 😅

@PatB42 you say that I should loose a bit the belt tension ?

[PatB42]

ah better ;-) , try the last one https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v5.1.0-alpha2

then yes loose a little the belt tension it's work ok !!! as i had prob with my X the chatlive told me that too , but in fact i use the last fmw and then as said was ok ..now why not ask chatlive who care u just explain u set up rail and not the bear you'll see if they can help ..again, it's free hehe some are good some are so so i mean the chatlive ..

[jerem2st]

@DesC21 Could you confirm to me that on the Y axis there is only the new motor to replace, all the other parts on Y are kept ? I'm sorting out the parts I need to print because I only have one printer, so no room for error :)

[PatB42]

??? with the 4.0 kit yes, i kept all bear part , usually i through it away all prusa plastic part ...;-)

[jerem2st]

??? with the 4.0 kit yes, i kept all bear part , usually i through it away all prusa plastic part ...;-)

Ok perfect ;) Tks !

[DesC21]

@DesC21 Could you confirm to me that on the Y axis there is only the new motor to replace, all the other parts on Y are kept ? I'm sorting out the parts I need to print because I only have one printer, so no room for error :)

yep, printed parts stay all the same.

[PatB42]

Hi one more MK4 Bear is alive...

now with the fmw 5.0 or 5.1 the autotest pass perfecto ... Am still very happy about print , speed, quality , but the transfert from slicer to link is so slow compare to the bear with the rambo mk3s and my RPI0w...waou i did a test for fun !!! 80Mo is like 38'' yes 38 second with Rpiow and exactly 10 mn yes 10 minute with the mk4 sad really bad..

[PatB42]

@DesC21 Hi

Since i installed the 5.1 FMW the Y axis is dead !!! i mean test can't pass it !! w the 5.0.1 is ok did some of you have the same or ?

after talking talking w chat live prusa ..they always looking for a some video that bring me noting and try to move the problem where it's not , the 5.0 the whole test are green like above and now with the last fmw 5.1 the Y axis not , unfortunately there is lot of improvement with the 5.1 !!

any idea !! or did u test it or only me !! thx

[PatB42]

well, just do it w my mk4 and same shit ..3.9 and 4.0 both Y axis forget !! so far no idea i'll try to modify some piece !!

[akbiocca]

The new Prusa Slicer 2.7 has binary gcode as does the new printer firmware. The smaller file size helps with the slow wireless throughput. It doesn't completely solve it, but it helps.

On Mon, Dec 4, 2023 at 11:16 PM PatB42 @.***> wrote:

well, just do it w my mk4 and same shit ..3.9 and 4.0 both Y axis forget !! so far no idea i'll try to modify some piece !!

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[PatB42]

thx akbiocca , but that not abt the slicer this is abt the printer itself , install the 5.1

then go to control and try XY calibration test let me know

[DesC21]

@DesC21 Hi

Since i installed the 5.1 FMW the Y axis is dead !!! i mean test can't pass it !! w the 5.0.1 is ok did some of you have the same or ?

after talking talking w chat live prusa ..they always looking for a some video that bring me noting and try to move the problem where it's not , the 5.0 the whole test are green like above and now with the last fmw 5.1 the Y axis not , unfortunately there is lot of improvement with the 5.1 !!

any idea !! or did u test it or only me !! thx

@PatB42 Hey, yes I tested all alpha versions and I am running the final 5.1 for quite some time without any issues. So I would say it's not about the bear upgrade/parts. Prusa are still changing quite a lot in the SW about the homing stuff and it's really sensitive... double check that the y-bearings are still in the correct spot, belt tension, alignment of the rods, just a few ideas about what to check.

PS.: Do you have the printer in an enclosure? If so make sure that the heatbed cable is not hitting the back of the enclosure. I printed an angled cable holder.

[akbiocca]

The smaller file size helps with time taken to load files, not with other issues.

My bear is not running yet, and it isn't a MK4 based setup.

On Mon, Dec 4, 2023 at 11:35 PM PatB42 @.***> wrote:

thx akbiocca , but that not abt the slicer this is abt the printer itself , install the 5.1 Capture.d.ecran.2023-12-05.083323.png (view on web) https://github.com/gregsaun/prusa_i3_bear_upgrade/assets/46328416/d3d8a24d-8a6b-4316-a2a8-cb5e604e594a

then go to control and try XY calibration test let me know

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[akbiocca]

And I'm probably not going to run Marlin.

On Mon, Dec 4, 2023 at 11:42 PM Alan B @.***> wrote:

The smaller file size helps with time taken to load files, not with other issues.

My bear is not running yet, and it isn't a MK4 based setup.

On Mon, Dec 4, 2023 at 11:35 PM PatB42 @.***> wrote:

thx akbiocca , but that not abt the slicer this is abt the printer itself , install the 5.1 Capture.d.ecran.2023-12-05.083323.png (view on web) https://github.com/gregsaun/prusa_i3_bear_upgrade/assets/46328416/d3d8a24d-8a6b-4316-a2a8-cb5e604e594a

then go to control and try XY calibration test let me know

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[PatB42]

yes I tested all alpha versions and I am running the final 5.1 for quite some time without any issues. So I would say it's not about the bear upgrade/parts. Prusa are still changing quite a lot in the SW about the homing stuff and it's really sensitive... double check that the y-bearings are still in the correct spot, belt tension, alignment of the rods, just a few ideas about what to check.

PS.: Do you have the printer in an enclosure? If so make sure that the heatbed cable is not hitting the back of the enclosure. I printed an angled cable holder.

waou happy for you DesC21 at now none of the 2 printer , 1 mk 3.9 for customer run and my 4.0 same shit , i did tested wit the alpha and was ok , , yes they changing all and say to me too it's more sensitive and asking to tighten more the belt !! pff i tight and nothing happend also why with the 5.0 all is ok then another fmw Y axis not !! and now is worse the heating nozzle don't pass the test too !!!! i have the adaptor w a steel once but again all test were good before !! what u mean the SW and what do u say abt checking the y bearings !! correct spot belt tension !! so far the alignement was ok !! but honestly it's boring as u test all w 1 fmw and then upgrade then all is shit !! pff thx guys

[PatB42]

DSC21 but 1 question did u run the XY axis test with ur 5.1 fmw ? just to see !!

[PatB42]

Hello dear Bear mk4 owner..; i found the problem on testing the Y axis i modify the y_belt_holder then all auto test was ok ouff please do a full test on ur mk4 or 3.9 and let me know but normally with the 5.1 fmw only the Y will have issue, if you don't want you can install the 5.0.1 then do the whole test and then all are green and then install the last fmw 5.1 without testing then that ok too but some how if before a print it test the Y axe !! then forget print..

[Bob6y]

I am not sure when you say "forget the print." On my side the y axis test has never passed. But my print are OK and I have All IS features. Quality is very good !

Till now I don't understand the y axis test never pass.

When I ask the printer to go to the home position, it do the correct motion to go there.

I suppose it's optional.

[PatB42]

waou great then ..or maybe bad luck to me !! with prusa we never know .. the IS and other are ok , and u can print if Y didn't pass the test even my thermistor is ok but not perfect as the connection inside the little tube are moving then the T° test nozzle is not passed !! they increase the sensitivity of each test ..

the idea is if you have time is take out the y belt holder then cut 2.5mm from the side whhich came in touch the motor, lead the printer to the right side when you look at the part you should have the belt in front of you then u cut the left part or print a new one is better and you still have the hole for the screw then clean all and try the XY test...should be ok then

[DesC21]

DSC21 but 1 question did u run the XY axis test with ur 5.1 fmw ? just to see !!

Yes I run the XY axis test, re-did the full wizard, reset the printer and tried again. No problems, y-axis test is always passing. Does it also fail on the complete test/wizard? I am currently not home but I can post a picture when I am back at the printer.

[PatB42]

well great for u and bad for me can't say more i tried on both and not 1 passed all failed..even i do the XY alone i mean only this test or the wizard full test !! it's weird as why it's not same on all printer !! i have changed the support for the Y axe so maybe is that !! but in fact the y belt holder is slapping the motor so that should be the same !!!

[DesC21]

well great for u and bad for me can't say more i tried on both and not 1 passed all failed..even i do the XY alone i mean only this test or the wizard full test !! it's weird as why it's not same on all printer !! i have changed the support for the Y axe so maybe is that !! but in fact the y belt holder is slapping the motor so that should be the same !!!

Okay, good news (or bad news however you see it :-)). I can replicate the issue, it is now failing for me too! There is definitely something going on with the firmware, I guess they are still playing with the homeing and now it is so sensitive, that it is failing for the bear frame. I am not sure why i didn't have it until now. I was flashing different FW back and forth and now it happens. I will try if I can somehow replicate the behavior and check the code changes... For now I will put up a notice on the printables page, thanks for letting me know @PatB42.

For me it is hitting the motor side a couple of times, then goes straight to the front with only one bump and says failed. Is it the same for you?

[DesC21]

@PatB42 Prusa just released 5.1.2. and guess what Y-axis passes the test again for me. Please check with the latest FW.

PS.: There is no mention of any changes to the test in the changelog....

[PatB42]

For me it is hitting the motor side a couple of times, then goes straight to the front with only one bump and says failed. Is it the same for you? hi DesC21 yes exactl same hit hit hit then back to front and the X red killer bear test..

really weird why you didn't have before, sorry for now ..i just can say welcome to the club eheh.. but i did talk w chat and 1 told me that yes they increase the sensitivity !! pfff why all was so good on the 5.0 then after all shit !! i don't understand them sometimes .. thx for the 5.1.2 didn't check it !! i'll see and let u know too

[Bob6y]

We could create another thread for All Who has this Y axis failure. On my side I have this issue since the beginning, end of september with the 5.0 firmware.

With the 5.1 the test of the Y axis was longer with the same bad result. It's not a blocking issue but we always have this test to perform message.

I will test the last one but no hope.

[gregsaun]

You can create all the new issue you like, no problem. However, I have to say that best would be to fork my repo, like this we have a base to report all type of issues and @DesC21 is more free to manage his MK4 project as he would like. I would follow and interact there too. Unfortunately Printables and co are not good at that and yes Git can be scary to use, so do what you like @DesC21

[akbiocca]

I have an early stock factory built MK4. I have noticed a lot of Y homing retries during print start for some time. It always goes ahead and prints fine, but it clearly retries the Y homing a number of times and shows a Y homing retry error on the screen. I didn't find errors in the logs.

I decided to look closer at the situation today, thinking that perhaps the Y bearings needed to be moved to maximize Y travel. What I found out is that the MK4 bed belt mount hits the motor mount a few mm before the Y bearing hits the frame in the back, restricting the bed total travel.

In the front the Y bearing does hit the frame at the end of forward bed travel, and I moved it a couple mm to give longer carriage travel. I don't see a homing error now. I haven't tried making a print yet but I really wonder if that belt mount is supposed to hit the motor mount. All this may have an impact on their firmware setup and be related to the bear homing problems.

Regards, Alan

On Sun, Dec 17, 2023 at 9:15 PM Grégoire Saunier @.***> wrote:

You can create all the new issue you like, no problem. However, I have to say that best would be to fork my repo, like this we have a base to report all type of issues and @DesC21 https://github.com/DesC21 is more free to manage his MK4 project as he would like. I would follow and interact there too. Unfortunately Printables and co are not good at that and yes Git can be scary to use, so do what you like @DesC21 https://github.com/DesC21

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[PatB42]

I decided to look closer at the situation today, thinking that perhaps the Y bearings needed to be moved to maximize Y travel. What I found out is that the MK4 bed belt mount hits the motor mount a few mm before the Y bearing hits the frame in the back, restricting the bed total travel.

yes that what i explain previously modify the y belt holder then the Y don't failed anymore..i mean that works for me !!i just install the 5.1.2 but didn't tried the test....i scare ;-)

[gregsaun]

I decided to look closer at the situation today, thinking that perhaps the Y bearings needed to be moved to maximize Y travel. What I found out is that the MK4 bed belt mount hits the motor mount a few mm before the Y bearing hits the frame in the back, restricting the bed total travel.

yes that what i explain previously modify the y belt holder then the Y don't failed anymore..i mean that works for me !!i just install the 5.1.2 but didn't tried the test....i scare ;-)

This is on purpose and shouldn't be more than a few tens of mm of the closest bearing position (you can move a bit back and forth the bearings during assembly, it is not constrained).

I do this because when you hit the bearing it does create a rotation of the Y axis and reduce lifespan of bearing and rod. Didn't MK3S implemented this at some point?

Honestly if they want to be that precise this issue will also happen to the stock printer, it is all an issue of tolerances during assembly and part themself.

[PatB42]

This is on purpose and shouldn't be more than a few tens of mm of the closest bearing position (you can move a bit back and forth the bearings during assembly, it is not constrained).

I do this because when you hit the bearing it does create a rotation of the Y axis and reduce lifespan of bearing and rod. Didn't MK3S implemented this at some point?

Honestly if they want to be that precise this issue will also happen to the stock printer, it is all an issue of tolerances during assembly and part themself.

100% agree , and that was smart for me too that the y belt holder hit the Y holder motor instead of the bearing... when u see and heard how many time it slap !! oups they increase the sensitivity with the 5.1 !! chat live told me ...

[gregsaun]

That was an idea from Vecko if I recall correctly.

So they might have increased, then had customers reporting issues with stock printer and now deceased in 5.1.2

[DesC21]

You can create all the new issue you like, no problem. However, I have to say that best would be to fork my repo, like this we have a base to report all type of issues and @DesC21 is more free to manage his MK4 project as he would like. I would follow and interact there too. Unfortunately Printables and co are not good at that and yes Git can be scary to use, so do what you like @DesC21

totally agree, Greg. I will consider this, hopefully over the holidays I have some time to do it (also thinking about doing the instructions like we discussed before) but it is all a matter of time. Keeping this up, answering questions takes a lot more time than I first thought :-).

I decided to look closer at the situation today, thinking that perhaps the Y bearings needed to be moved to maximize Y travel. What I found out is that the MK4 bed belt mount hits the motor mount a few mm before the Y bearing hits the frame in the back, restricting the bed total travel. yes that what i explain previously modify the y belt holder then the Y don't failed anymore..i mean that works for me !!i just install the 5.1.2 but didn't tried the test....i scare ;-)

This is on purpose and shouldn't be more than a few tens of mm of the closest bearing position (you can move a bit back and forth the bearings during assembly, it is not constrained).

I do this because when you hit the bearing it does create a rotation of the Y axis and reduce lifespan of bearing and rod. Didn't MK3S implemented this at some point?

Honestly if they want to be that precise this issue will also happen to the stock printer, it is all an issue of tolerances during assembly and part themself.

I rebuild my old MK3 with the newest MK3S+ parts, I will compare how the y-axis looks at the moment. But I guess if it was a more widespread problem I would guess more people would comment on printables, so far none said anything about y-axis issues. Same as for me I had all FW version and was only able to get the issue on 5.1. but now on 5.1.2 it's fine again. So it must be very fine margins...

BTW I do get occasionaly recalibration of the x-axis when starting a print... this was especially bad on 5.0 pre release version, now it's mostly fine.

[gregsaun]

@DesC21 I know very well it takes time when you care about the community and your project. You do it very well. We can keep this open, no worry.

I am pretty sure Prusa went too sensitive and they had to rollback, I cross my fingers.

Would be curious for MK3S. If this is the case you could push them to do it on MK4 and so they will have to lower their precision :)

[jerem2st]

Hello everyone, I just transformed my MK3S Bear into the MK4 Bear with the kit. Unfortunately I have the same problem on the Y axis but also the Z axis (FMW 5.1.2) For those who upgraded, did you use PRUSA bearing clips?? I kept all the MK3S bear parts on the Y axis is this correct?

[jerem2st]

I would like to downgrade to 5.1 to test but I can't do it, which button should I press during the logo? the reset one or the roulette button?

[DesC21]

Hello everyone, I just transformed my MK3S Bear into the MK4 Bear with the kit. Unfortunately I have the same problem on the Y axis but also the Z axis (FMW 5.1.2) For those who upgraded, did you use PRUSA bearing clips?? I kept all the MK3S bear parts on the Y axis is this correct?

thanks for the feedback. Y-axis is still a bit hit and miss I am afraid. People on the Prusa Discord also report of homeing issues with the stock frame. MK3s bear parts for the y-axis should be fine (I am running the new y-axis holders For the Z-axis you are the first one I am afraid, you got the new z-rods and everything for the z-axis right (you got a MK4 upgrade kit right)? Do you also use the damper pads on the motors?

I would like to downgrade to 5.1 to test but I can't do it, which button should I press during the logo? the reset one or the roulette button?

This is how you can flash older versions (based on post from Jakub Dolezal).

1. Download the FW that you want to flash
2. Copy it to the USB drive (make sure it is FAT32)
3. Insert the drive into the printer (turned off or running)
4. Turn on or restart the printer, upon the boot double press the knob (roulette button)
5. Wait for a few seconds, screen informing you about flashing the firmware will appear Flash the FW.

Maybe also try FW 5.0, this is where we had the least problems with homeing, I think! 5.1 was the worst offender yet :-)

PS.: make sure there is only one FW on the stick, otherwise the newest will always show.

[jerem2st]

Thank you for your quick feedback. Yes I have the complete MK4 kit (the most expensive) with the 10mm rods and yes I use the shock absorber pads. "I'm using the new y axis supports" could you give me the link to this part so that I can test it? I will test FMW 5.0 and get back to you I'm continuing my research to figure out what's going on. Could you give me the dimension on top frame to top z-top? I currently have 5.7mm Would you share your complete F3D model, it would help me enormously?

[DesC21]

"I'm using the new y axis supports" could you give me the link to this part so that I can test it?

Sorry probably a misunderstanding, they are not new printed parts. I meant the standard bearing holders that come with the MK4 kit.

Could you give me the dimension on top frame to top z-top? I currently have 5.7mm Would you share your complete F3D model, it would help me enormously?

This is what the model gives me (I can't measure my frame right now but I can get back to you on that). Maybe your z-rods are not fully seated? I will upload the model and share a link here, but it will take a couple of days.

I should really setup the github page, that would make sharing a lot easier... Sadly I don't have the time but it will come.

[DesC21]

I do this because when you hit the bearing it does create a rotation of the Y axis and reduce lifespan of bearing and rod. Didn't MK3S implemented this at some point?

I just checked on my MK3S and the bearings are hitting the printed parts (used the newest parts from Prusa and switched to the standard bend sheet bearing holders).

[jerem2st]

@DesC21 I just upgraded to firmware 5.0 and all the tests are OK... So the problem comes from the sensitivity of the new firmware, what do you think ?

[jerem2st]

Maybe your z-rods are not fully seated ? -> Too bad there is no hole like on the original parts to see if the rods are pushed in as far as possible, perhaps an improvement to be made on the Z motor mount would be great :) I will check this point because the rods are very hard to fit ;) Thank you very much for the help

[DesC21]

@DesC21 I just upgraded to firmware 5.0 and all the tests are OK... So the problem comes from the sensitivity of the new firmware, what do you think ?

ok, this again confirms the problems with the sensitivity changes by Prusa... I hope they figure this out with the next releases because it is also happening on the stock frame. As a work around, now that all the test are passed, you can update back to 5.1.2 but don't re-run axis tests! Than you are good and no messages will show up. Maybe homeing errors are more frequent before starting a print, but I can't confirm this right now (didn't happen for me)

[jerem2st]

I explore the @PatB42 trail. I took the 3D model of the Y belt support with 2.5mm less on the Y motor side. I'm printing this and would like to know if the Y axis test works better on version 5.1.2. I'll let you know the result when I test it :)

Another point on the lcd_support_b part I had to file the return tab which holds the card because the model is too thick by around 2mm

[jerem2st]

@DesC21Je viens de passer au firmware 5.0 et tous les tests sont OK... Donc le problème vient de la sensibilité du nouveau firmware, qu'en pensez-vous ?

ok, cela confirme encore une fois les problèmes avec les changements de sensibilité par Prusa... J'espère qu'ils comprendront cela avec les prochaines versions car cela se produit également sur le châssis d'origine. Pour contourner le problème, maintenant que tous les tests sont réussis, vous pouvez revenir à la version 5.1.2 mais ne réexécutez pas les tests d'axe ! Alors vous êtes bon et aucun message n’apparaîtra. Peut-être que les erreurs de référencement sont plus fréquentes avant de démarrer une impression, mais je ne peux pas le confirmer pour le moment (cela ne s'est pas produit pour moi)

So I updated to version 5.1.2 and indeed before each print it recalibrates the axes, then announces that there is an obstruction on the Y axis and therefore a failure. Fortunately, it is possible to start printing but I must say that the recalibration procedure for each print followed by a failure is very painful.

[DesC21]

So I updated to version 5.1.2 and indeed before each print it recalibrates the axes, then announces that there is an obstruction on the Y axis and therefore a failure. Fortunately, it is possible to start printing but I must say that the recalibration procedure for each print followed by a failure is very painful.

Oh so this is a different behavior that I see on my printer. When the homing fails before the print, it simply says that it is re-calibrating which takes like 10s and then it continues without problem...

Right now I don't see the issue with the parts to be honest, It is still the same as the original y-axis on the stock frame. We are just using the belt holder instead of the bearing as "endstop". I will look into this in the new year though, when I run 5.1 I can replicate the issue on my printer.

[jerem2st]

So I updated to version 5.1.2 and indeed before each print it recalibrates the axes, then announces that there is an obstruction on the Y axis and therefore a failure. Fortunately, it is possible to start printing but I must say that the recalibration procedure for each print followed by a failure is very painful.

Oh so this is a different behavior that I see on my printer. When the homing fails before the print, it simply says that it is re-calibrating which takes like 10s and then it continues without problem...

Right now I don't see the issue with the parts to be honest, It is still the same as the original y-axis on the stock frame. We are just using the belt holder instead of the bearing as "endstop". I will look into this in the new year though, when I run 5.1 I can replicate the issue on my printer.

I am going to test the Y belt holder this afternoon with 2.5mm less on the Y motor side. I'll tell you what's going on in the hope that this fixes the problem. @PatB42 is right there remains approximately 1mm of clearance between the bearing and the end of the Y motor stop

[jerem2st]

So I updated to version 5.1.2 and indeed before each print it recalibrates the axes, then announces that there is an obstruction on the Y axis and therefore a failure. Fortunately, it is possible to start printing but I must say that the recalibration procedure for each print followed by a failure is very painful.

Oh so this is a different behavior that I see on my printer. When the homing fails before the print, it simply says that it is re-calibrating which takes like 10s and then it continues without problem...

Right now I don't see the issue with the parts to be honest, It is still the same as the original y-axis on the stock frame. We are just using the belt holder instead of the bearing as "endstop". I will look into this in the new year though, when I run 5.1 I can replicate the issue on my printer.

I tested the Y holder with 2.5mm less on the Y motor side, unfortunately the test still does not work. I am continuing my research while waiting for your complete file to check my dimensions. I have completely inserted my rods and I no longer have any problem on the Z axis