Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?  

RE: Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?

The answer you seek, was 5 threads down in this sub forum. https://forum.prusa3d.com/forum/prints-troubleshooting/z-offset-incorrect-textured-sheet

Add -0.03mm or -0.035mm (currently using) to the Z Offset on the printer profile. You can create a printer profile for the Textured Sheet and add the -0.035mm to the Z Offset. You'll need elephants foots compensation  of 0.4

Always Peform a live z test for your build plate. Also the Prusa PETG profile sucks.

I have used the galaxy black petg. See the Zip, Cal cube, Live Z and all my filament and print settings. Cal cube is just for the cube, my structual in the live z is for everything else. Hope this helps

Calibrate extrusion for the filament profile.

Measure diameter of the filamentMultplier, by using hollow cube, measure the wall thickness,  See Precise Method -->   https://help.prusa3d.com/article/extrusion-multiplier-calibration_2257

Print the Cube with 1 perimeter, 2 bottom, no top so you can measure wall thickness.

Live Z & Cal Cube

RE:

Also are you using the Actual textured or the Satin sheet that came with the printer? The z offset I provided was for the Textured sheet, haven't done a live Z for the Satin yet.

Also wash your plates in soap and water 1st, really really well, my 3 plates were very dirty from the factory, especially the Satin, then IPA.

RE: Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?

> Also wash your plates in soap and water 1st, really really well, my 3 plates were very dirty from the factory, especially the Satin, then IPA.
This. Get a normal dishwasher soap, use a warm water and scrub the plate very well so the water does not run with streaks/droplets but adheres to the print sheet over larger area.

I had exactly the same issue that PETG was absolutely not sticking to the brand new textured sheet.

RE: Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?

To _KaszpiR_ - Thanks for that tip: I will try that and report back!

To Ruebarb - Thanks also:
I will be sure to first give the sheet a good washing (as Kaszpir also noted).
It is indeed a textured sheet (ordered that as an extra item, by default you just get a satin sheet with the printer).
I had already seen your other post that you linked:
As per my photos, you can see the bottom does not look bad (not like your BEFORE example), so I was thinking that was not an issue for me.
Given that difference, I did not think it safe to make that Z adjustment. Do you still think I should do that Z adjustment (in addition to washing) despite the differing surface results?

RE: Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?

If you did a live Z test, you would see the same type of results. Printing an object is not a live Z test. The test is to print a single layer to verify layer adhesion. You do not want to make adjustments blindly, but to verify.

https://help.prusa3d.com/article/live-adjust-z_112427

Don't do anything drastic until you have made certain the sheet is clean and the print is sliced for the correct nozzle - but I wouldn't print a benchy as a first attempt.  The original benchy from https://www.3dbenchy.com/ is a useful torture test for diagnosing printing issues - but nowadays there are thousands of benchy variants and remixes that are not.

You have a brand new machine that has been shaken up in transit so it will be a while, perhaps a month, before it has settled down and run-in enough for printing an original benchy to be worthwhile.

I have never printed a benchy btw, I have never needed one.

So: clean the print-sheet(s) - dishwashing detergent (dawn/fairy) and rinse well with HOT water then start printing low profile, useful objects and build some experience, make your first mistakes and establish a routine then, after you have done your first monthly maintenance perhaps print a benchy to check your now stable machine is correctly dialled in.

Cheerio,

RE:

Before seeing the rest of the responses I tried two more times (with same results):

First retry: did this after thoroughly cleaning plate with warm water and Dawn dish soap using a new clean rag (Costco), followed by thorough alcohol cleaning and wipe down with a new microfiber cloth. Maybe I really did not clean it enough? I think I will retry with hotter water and perhaps a synthetic brush? (Don't have sponges handy.)

Second retry: tried with a new profile with z offset of -0.04mm (saw someone else recommending -0.05 elsewhere, so split the difference between that and what Ruebarb mentioned).

Not sure what to do next other than retry the cleaning. Re Ruebarb link for Live Adjust Z: if C1L even supports that (menus not as shown in linked article), it is really just doing the same kind of Z adjustment I did in the slicer: I can probably instead just pause printing after the first layer and examine/photo the result to see how it looks.

Any other ideas?

EDIT TO ADD: I used the Prusa 3D benchy from printables (since the bgcode version on the provided USB was for PLA). Link: https://www.printables.com/model/3161-3d-benchy

Three tries, same results

TWO MORE FAILURES -- RE: Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?

Weird problem editing prior post. Corrected title here.
Also had wanted to edit that my first retry also included correcting the nozzle type setting in slicer: first try was 0.4, but the C1L comes with 0.4HF nozzle.

RE: Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?

Thanks. Will definitely try something simpler next time: the included keychain is very simple, will try that after another/better plate cleaning. But will also see if anyone has any other ideas!

RE: Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?

I had the same problem with the textured sheet and PETG, it was all about the cleaning procedure, don’t use IPA at all, just clean with dishwashing soap and water, then for inbetween prints I use window cleaner and a clean cloth.

RE:

Use the Live Z file I gave you in this post (Bottom), https://forum.prusa3d.com/forum/postid/776776/ It also includes the filament profile this PETG, you'll need to adjust the extrusion based on your cal cube testing.

If you can print this simple file successfull, should come off the bed as one perfect piece, and all the layers are bonded together without gaps (Hold it up to a light) and the surface is also not too rough (too low). Like the Prusa article states. Then you should have solved your adhesion issue, assuming your plate is clean.

You can make adjustments while the print is going, do each corner square at a different setting, give you some idea which offset is correct or you can just print the entire file with different settings in the printer profile. Doing it live may be more than your skill level at this time.

Live Adjust Z (LoadCell)

The Prusa CORE One, and the Original Prusa MK4/S, MK3.9/S, and XL are equipped with a LoadCell, which will calibrate the first layer automatically.

In case you would still like to fine-tune it, you can long-press the LCD knob while the first layer is printed. The Live Adjust Z will not be saved for the next print in this case. 

You can also tune this value in PrusaSlicer, under >Printers >General >Z offset, where a negative value means a more squished first layer, and vice versa. This value is specific to the G-Code where this value is set. 

If you have constant issues with the first layer on a Prusa printer with the Loadcell, check the dedicated paragraphs from the general first layer issues article. 

RE: Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?

Thanks for all the suggestions so far.

Today I cleaned the sheet once more (dish soap and water only, per Anders).

Then based on Ruebarb's post I tried to print the Precision Method Cube STL (linked from this help article).At first, after bottom layer and starting on walls, I saw a couple blobs that I thought would be a problem, but it finished OK: see photos.

I will post full details later (only get access to a new micrometer tomorrow).

RE: Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?

I am doing some more testing of the Galaxy PETG, found for a tiny part with very little contact area, it would not stay on the textured sheet, but worked great on the satin sheet, very strong adhesion. Also thinking this prusa petg is very moisture sensative too, printed with sunlu petg for 6 years on a textured sheet on the MK3S, with zero issues, only ever had to dry it once.

RE: Failed First Print - Fix for PETG Benchy that shifted after a couple layers on textured sheet?

Interesting, thanks. My micrometer from Amazon got delayed, so no update yet.
But I can say I pulled the PETG direct from a dryer at UNDER 10% humidty just before every print (and it is winter here and cold and dry anways).
So moisture is not an issue.
Will have to consider trying on a satin sheet at some point!
But first, will check precision cube wall measurements to see if flow rate needs adjusting ... once that micrometer arrives.

Posted by: @ruebarb

I am doing some more testing of the Galaxy PETG, found for a tiny part with very little contact area, it would not stay on the textured sheet, but worked great on the satin sheet, very strong adhesion. Also thinking this prusa petg is very moisture sensative too, printed with sunlu petg for 6 years on a textured sheet on the MK3S, with zero issues, only ever had to dry it once.