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Prusa Mini with PETG  

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Adam95
(@adam95)
Active Member
Prusa Mini with PETG

I have had the printer for a couple months and feel very comfortable with PLA and decided the try out PETG. I bought a spool of Prusament PETG and bought the textured powder coated bed and started doing the first layer calibration. It seems to be no matter what height when i give the corners the slightest of touches it moves very easily. Any help would be very much appreciated. 

Posted : 19/06/2021 4:51 pm
boB
 boB
(@bob-3)
Active Member
RE: Prusa Mini with PETG

Most of my printing is with PETG on the textured bed.  The height is quite a bit less than the smooth bed, I can't find my recent numbers.  If your PLA height is more than -1.5 you may not reach textured bed height, mine was -1.95 before I moved the PINDA.

Posted : 19/06/2021 6:51 pm
fuchsr
(@fuchsr)
Prominent Member
RE: Prusa Mini with PETG

The textured sheet is about 0.4 thinner than the smooth sheet. 

Posted : 19/06/2021 7:06 pm
boB
 boB
(@bob-3)
Active Member
RE: Prusa Mini with PETG

I measured the thickness of the two sheets (fuchsr is correct).  I thought the PINDA should sense the surface of the sheet and compensate for the difference but it does not.

Posted : 19/06/2021 7:58 pm
fuchsr
(@fuchsr)
Prominent Member
RE: Prusa Mini with PETG

Remember that you can save "sheet profiles" in the firmware, for different sheet types.

Posted : 19/06/2021 8:00 pm
Adam95
(@adam95)
Active Member
Topic starter answered:
RE: Prusa mini with PETG

Yeah my PLA setting is at -1.900 and it works perfectly so I can't really get much closer to the bed. So what do I do?. Thanks for the replies!

Posted : 19/06/2021 8:52 pm
Baklin
(@baklin)
Reputable Member
RE: Prusa Mini with PETG

The only thing you can do is raise the PINDA. And you will have to re do your Live Z for the smooth sheet after that.

Also make sure the textured sheet is very clean. When I first used my textured sheet I had to clean it a few times before it worked fine. Clean with dish soap and lots of hot water.

Posted : 19/06/2021 10:26 pm
Adam95
(@adam95)
Active Member
Topic starter answered:
RE: Prusa Mini with PETG

Okay thanks! will give both of them a try.  Appreciate all your help!

Posted : 19/06/2021 10:36 pm
fuchsr
(@fuchsr)
Prominent Member
RE: Prusa Mini with PETG

@adam95

If you're close to or above -2, I would reposition the PINDA higher.

Instructions for adjusting the PINDA are in Step 16 of https://help.prusa3d.com/en/guide/how-to-replace-superpinda-mini-mini_179912 (Mini) or
https://help.prusa3d.com/en/guide/how-to-replace-superpinda-mk3s-mk3s_179920 (Mk3S)

I put this little helper on Prusaprinters.org to help position the SPINDA: https://www.prusaprinters.org/prints/57192-spinda-height-adjustment-tool-mounts-into-3030-ext. Works better than zip ties or credit cards, which have less well-defined heights.

For an illustration of relationship of distance of PINDA to nozzle and sheet, see

Posted : 19/06/2021 11:20 pm
BogdanH
(@bogdanh)
Estimable Member
RE: Prusa Mini with PETG
Posted by: @bob-3

....I thought the PINDA should sense the surface of the sheet and compensate for the difference but it does not.

PINDA measures distance to metal part of the sheet and can't know how thick the coating layer is.

Mini+ with Bondtech upgrade & modified firmware...
Posted : 20/06/2021 8:39 am
boB liked
boB
 boB
(@bob-3)
Active Member
RE: Prusa Mini with PETG

@fuchsr

Looks good!  I was a little disappointed with Prusa and their "zip tie/credit card" method, I am an engineer and like real  repeatable numbers and dimensions.  😉

Posted : 20/06/2021 2:47 pm
Adam95
(@adam95)
Active Member
Topic starter answered:
RE: Prusa Mini with PETG

Thanks everyone i got the PETG to stick and print. Its a little rough round the edges but i know its more made to print practical things. If you have any tips to clean the print up i will appreciate it. Thanks for all your help.

 

This post was modified 1 month ago by Adam95
Posted : 20/06/2021 6:31 pm
Lupin
(@lupin)
Trusted Member
RE: Prusa Mini with PETG

Your Benchy's bottom shows filament strings to some extent. I just printed one with Prusament PETG Carmine red, and the bottom reflects the texture of the bed. Individual strings of filament cannot be seen. Perhaps your Z is still a tad high?

Posted : 30/06/2021 8:03 am
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