3DP Tip: PETG, PEI and Ethanol¶
Parts printed from PETG will stick to Prusa's PEI sheet a lot, enough to delaminate or crack the PEI below during removal.
Here is Prusa's material guide. In PETG's page it explicitly says:
Printing on smooth PEI surface might damage the sheet.
Ask me how I found out.
A simple solution is to spray 70% ethanol on the print before removing it. It will cool the parts and get between the PEI and PETG, helping them come apart without damage or brutality.
Here is a cracked PEI sheet for reference:
