Typos in the arm BOM and number of print pieces

[sl1pkn07]

Hi

i've found some typos in the BOM and in the numer of print pieces in the ARM

but in the instructions show 2

in the BOM sections, show need a 20t(eet) GT2 for 5mm bore

but in the instruction, show a 20t GT2 8mm bore

this is not expecified in the BOM, to avoid confusions (some kits sell 60t pulleys (8mm bore) + 280mm belts + 20t pulley but with 5mm bore instead of 8mm). i think this need be specified in the BOM

greetings

[sl1pkn07]

Hi

also found a missing belt. is the same size like the two others?

greetings

[madl3x]

Thanks for noticing the issue. I will verify the BOM and fix it right away.

also found a missing belt. is the same size like the two others?

Yes, they are 3 and all are 280mm belts.

[sl1pkn07]

Hi again. durning print, ive found sommeting issues.

the Arm_Shoulder_Connector, the screws to fix the bearing arm, seems so be a little more lengeith, 12mm instead of 10mm, because with 10mm the screw is hidde in the piece instead rebase to grip the bearing

and in the Arm_Base_ZHub_Top and Arm_Base_ZHub_Bottom, the holes for the screws not grip the screws. i'm not sure is is a tolerance problem or by design. ive fixing it driling deep the holes and use large screws

greetings

[madl3x]

the Arm_Shoulder_Connector, the screws to fix the bearing arm, seems so be a little more lengeith, 12mm instead of 10mm, because with 10mm the screw is hidde in te piece instead rebase to grip the bearing

I checked the design and indeed those are M3 x 12mm not M3 x 10 mm. The documentation for this part wrongly says all screws are M3 x 10. For holding the front bearing please use M3 x 12 mm screws.

and in the Arm_Base_ZHub_Top and Arm_Base_ZHub_Bottom, the holes for the screws not grip the screws. i'm not sure is is a tolerance problem or by design. ive fixing it driling deep the holes and use large screws

Are you talking about Z-nut screws that enter the Arm_Base_Zhub? Those have a 3.1 mm diameter in design and should hold M3 screws pretty well. If you are slicing with Cura, please check the Horizontal Expansion setting. It may help you get the part printed right.

[madl3x]

K -> C

XD

Yes, correct, please create a different issue for that, so we can easily track each problem.

[sl1pkn07]

the Arm_Shoulder_Connector, the screws to fix the bearing arm, seems so be a little more lengeith, 12mm instead of 10mm, because with 10mm the screw is hidde in te piece instead rebase to grip the bearing

I checked the design and indeed those are M3 x 12mm not M3 x 10 mm. The documentation for this part wrongly says all screws are M3 x 10. For holding the front bearing please use M3 x 12 mm screws.

yes. i see that and i fixed in my build

some other pieces need M3x8 instead of M3x10

• for join Arm_EMount_Fan to Arm_EMount_Base_Left+ Arm_EMount_Base_ABL
• for hold Z Nema17 to Frame_Z_MotorConnector (with washer)
• for hold the 8x60mm calibrated row to Arm_Elbow_RodHub (the screw not thread all, but better than M3x10

and M3x15

• for hold the Arm_Elbow_RodHub to Arm_Elbow_Plates

the Arm_Base_MotorPlate is now in print process

and in the Arm_Base_ZHub_Top and Arm_Base_ZHub_Bottom, the holes for the screws not grip the screws. i'm not sure is is a tolerance problem or by design. ive fixing it driling deep the holes and use large screws

Are you talking about Z-nut screws that enter the Arm_Base_Zhub? Those have a 3.1 mm diameter in design and should hold M3 screws pretty well. If you are slicing with Cura, please check the Horizontal Expansion setting. It may help you get the part printed right.

the holes should be small than the outter periferic thread of the screw. the drill (normalized, i think) for making M3 threads is 2.5 or 2.25mm/diameter (my thread driver kit have this drill) (https://fullerfasteners.com/tech/recommended-tapping-drill-size/ for example). yes, is possible fix it on the fly with the horizontal_expansion (i use superslicer, (from now (the ZHubs is the second set of piece i print) i set 0.1 that value in all pieces), but i think should be fixed in the STL

Yes, correct, please create a different issue for that, so we can easily track each problem.

ok

greetings

[sl1pkn07]

M3x8

M3x8 (center) and M3x15

[sl1pkn07]

First Arm_Base_MotorPlate printed

• the screws for grab the nema17 should be M3x8mm (and washer) instead of M3x10
• if the screws for grab the GT2 idlers is M3, the GT2 idlers should be with bore 3mm instead 5mm. or need make a caps?

greetings

[madl3x]

• the screws for grab the nema17 should be M3x8mm (and washer) instead of M3x10

I'll keep that in mind but mostly depends on the motor you have. Some NEMA17 motors have deeper threads for screws. The Arm_Base_MotorPlate part is 4 mm thick where it connects with the motor and therefore 6mm from the screw's thread will go into the motor itself. But some motors may not accommodate that.

• if the screws for grab the GT2 idlers is M3, the GT2 idlers should be with bore 3mm instead 5mm. or need make a caps?

That is another good remark. The GT2 idlers I used are 3mm ID, not 5mm inner bore like the BOM says. I will correct that and close this issue when I fix the BOM.