Infilll and Solid Infill and Max speeds for 0.2 print profile (stock) is way too high for certain filaments

[NovaViper]

Hi there! I wanted to report an issue relating with the Infill/Solid Infill and Max speeds for the stock 0.2 print normal profile. For some odd reason, they're set REALLY high (80 for the infills and 90 for the max speed to be extact) while every other profile is set between 50-71. For certain filaments (PETG in my case) this is way too fast for the infill to handle and it will immediately get ripped off the model and make basically large gashes in the model (which inventibly causes print failures).

Currently, I've set those settings all to 56 and that seemed to have fix my troubles. I haven't tried out the high speed on PLA but it's definitely way too much for PETG to handle

[sn4k3]

Hello, Speeds are based on MVS, for 0.2mm profile the 80mm/s seens ok for normal PETG (80 x 0,2 x 0,45 = 7,2mm^3/s) While PETG is cap at 8mm^3/s on filament tab, so is under the PETG limit. Now it can depend on temperature and filament you using, can you post your filament brand/name and temperatures you using? Also the motor and gear can influence max MVS.

Instead of mess with speed which affect all other filaments, you can clone PETG filament and set "Max Volumetric Speed" to a lower value, and speed will ajust according. Example: 5mm^3/s MVS will give you a max speed of 56mm/s and slicer will respect that on that specific filament, if you switch to PLA for example it will boost for 7,2mm^3/s without the need of switch speed on profile tab

[NovaViper]

I tried with ColorMe3D Blacker Black and Haze Purple, and Amazon Basics Purple. All running at 235C for the hotend and 75C for the bed

[sn4k3]

That's strange, 56mm/s seens low for infills given that profile, i renember i had no problem with Prusa PET when i have stock, now i can't test anymore since no longet stock. I have volcano and i can print petg up to 24mm^3/s, volcano have 3x more capability so we divide by 3, 24/3 = 8mm^3/s which fit inside the limit set for stock. Do you have lastest master profile? Because i updated machine limits which were in crazy numbers

[NovaViper]

Oh! So it seems I do have an older version of the master profile. I'm updating my settings now :)

[sn4k3]

Oh! So it seems I do have an older version of the master profile. I'm updating my settings now :)

Update it and report back

[NovaViper]

I just got new profile settings added and I did decrease the volumetic speed to 7, though I still have some blobbing.. I'm going to go and switch out my nozzle (I have a 0.5 nozzle installed) and see if that's what is causing the issue

[sn4k3]

Wait you have 0.5mm nozzle in but using the 0.4 profiles?

[NovaViper]

Yeah, I had to restort to switching it because I kept having issues printing 0.32 layer heights with my 0.4 nozzle

[sn4k3]

You can't use 0.4mm profiles with a 0.5mm nozzle, there are change that must be done, including on printer tab... If you using stock profiles with that nozzle size you will have extrusion problems

but 0.4mm nozzle can do 0.32mm layers, the problem you have maybe related to other thing (If speed down doesnt help)

[NovaViper]

Iit started failing again once I went back to my 0.4 nozzle after the first layer. The filament settings was all stock (except for my temps) .-. This print was done at 0.32 layer height

[NovaViper]

[sn4k3]

Look likes more a height problem than speed. Does your extruder click? Try put 5 at volumetric speed under filament tab

[sn4k3]

Use 40x40 square tests to speed up tests

[NovaViper]

I didn't hear the extruder clicking, and whenever it prints perimeters and walls, it doesn't have the issue shown. Im currently releveling the bed just in case it's off from my last print in PLA

[NovaViper]

Ok.. so I got a 50x50x1.28 mm rectangle going.. and it seems to be much better at 5mm^3/s

[sn4k3]

IF better but not perfect try lower, like 4

[NovaViper]

Welp, it did this in the end

[NovaViper]

But all the other layers were fine (but I didn't catch the final or the one before it to thoroughly confirm it)

[NovaViper]

I can confirm that it did indeed do that in the very top layer

[NovaViper]

There was some issues in the layer right under it to.. it looks like at one particular spot it didn't stick properly

[NovaViper]

Sigh The 4mm^3/s top layer had issues, no layer had issues

[sn4k3]

Well set MVS to 1 (lower than TPU xD) if you still have problem is not related to speed. Make sure your e-steps are calibrated, and flow is at 100%

[NovaViper]

Should I turn off the cooling fan entirely? The cooling fan seems to kick on at the very last layer

[sn4k3]

Should I turn off the cooling fan entirely? The cooling fan seems to kick on at the very last layer

You can try, but i guess not the fan causing the problem Can you try with PLA instead?

[NovaViper]

I just started the print at 1VMS and no fan for the PETG. I'll try the PLA one afterward

[NovaViper]

This time at 1 MVS and the fan off,it came out perfect for the PETG

[sn4k3]

If MVS value is respected that mean +/- 7mm/s speed. Can you confirm that is that slow? Now you can reenable fan as it was

[NovaViper]

It came out really slow.. took an entire hour to finish the print instead of 15 minutes

[NovaViper]

That's when I had the MVS set to 1

[sn4k3]

Can you try now with PLA? Also make sure your spring have tension

[NovaViper]

Alrighty. im starting the PLA print now

[NovaViper]

The PLA one came out perfectly too, I'm using all the stock settings in the Generic PLA profile

[sn4k3]

With stock speeds right? Then something is wrong with filament, do you have other pet brand? Humidity can ruin a spool

[NovaViper]

I do have other brands, but they all have had the same issue

[sn4k3]

Well if problem presists on PET the best bet is test the max MVS your printer steup support. a good way to set that is print with stock profiles. At second layer when problem comes start slowing down the printer speed using the knob (FR) up you see a good line pattern. Then look at FR percentage, lets say it's 75%. Pick stock MVS and multiply by 0.75, eg: 8*0.75 = 6 Thats the way i pick the real max speeds, but again, max everything is not a general rule for everyone, a better extruder can extrude more, depend on each one setup

[NovaViper]

Ya think I should also use completely stock filament settings from the Generic PET profile?

[sn4k3]

To get your limit yes, and when found create or modify the profile with your value

[NovaViper]

I just noticed that the infills are really high with all stock settings

[NovaViper]

It's not ripping up layers but it still looks a bit rough

[sn4k3]

I just noticed that the infills are really high with all stock settings

All settings print at same MVS on infills, speed is a illusion, printing at 40mm/s can be slower than a 20mm/s on other setup, what matter is the Volumetric speed (MVS). So all profiles are boosting infill and solid infill to max. capability. Top and bottom infill are always slower to get a better finish.

Find your best infill speed and use that as reference

6 MVS on your preview seens nothing special, stock extruder can do 10 to 12 MVS on a well calibrated extruder. I already give the margin and set to 8 for PET. But if you having problem reduce it

[NovaViper]

Just finished the stock settings print and it got better when I slowed it down to 70%, but then for some reason the top infill got blobs in it

[NovaViper]

[sn4k3]

Just finished the stock settings print and it got better when I slowed it down to 70%, but then for some reason the top infill got blobs in it

Try 60%, then 50% keep testing up to get the perfect look

[sn4k3]

What mods you have on your printer? Complete setup? As i see is not stock stock

[NovaViper]

The bed is just a plain glass pane I got from Home Depot coated with sugar water, the hotend is actually still the same, except I have mounted my extruder to be directly ontop of the hotend (hence it's direct drive now) and the fan shroud is the Petsfang Bullseye

[sn4k3]

Ok then you should calibrate your extruder. Mark 20cm with a pen on filament, using terminal or LCD extrude 100mm. When it stop check if mark hit at 10cm on the ruller. If no you need calibrate your e-steps. Also as you have direct drive how much retraction you set on extruder?

[NovaViper]

I used to have 1.8mm and 70mm/s for the retraction; when doing the tests, I started using 0.8mm and 35mm/s

[NovaViper]

Also how do I calibrate e steps on a direct drive extruder?

[sn4k3]

I used to have 1.8mm and 70mm/s for the retraction; when doing the tests, I started using 0.8mm and 35mm/s

Thats seens ok as start point.

Also how do I calibrate e steps on a direct drive extruder?

With the method i said before, marking, extruding and verify extruded lenght

[NovaViper]

The e steps are fine, I marked 120 and told to extrude 100, and 100mm got extruded