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PETG - Textured Sheet Adhesion Problem  

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JoeinCal
(@joeincal)
Active Member
PETG - Textured Sheet Adhesion Problem

My printer has been in use for six months and I ran into an adhesion problem with the textured metal sheet and PETG Prusament.  My prior prints were all with PLA and the smooth metal sheet.  My printer firmware and drivers were all updated today.  This whole thing started when a friend asked me to print several small parts in PETG.  I used a brand new Prusa textured steel sheet and a factory sealed spool of black PETG Prusament.  The problem I ran into was the PETG would not adhere to the textured steel sheet while running the first layer calibration. My Z height was set for -.600mm for PLA with the smooth sheet.  I started at 0  and went all the down to -.600mm for the textured steel sheet and PETG over maybe 20 runs.  I washed the sheet with alcohol on every run.  Acetone was also tried.  The first horizontal line seemed to be ok but the first vertical line got pulled to the left when the second horizontal line printed.  The square pattern at the end of the run would glob around the  nozzle.  I decided to punt and go back to the smooth sheet and used glue as a release agent.  The parts came out perfect.  

One thing I found interesting is that that nozzle temperature is set at 230C for the first layer calibration but is set at 240C by PrusaSlicer for the first layer. The bed temperature was set at 85C in both cases.  Does anybody have any ideas what to try next with the textured sheet/PETG?       

Posted : 24/01/2021 7:32 pm
JoeinCal
(@joeincal)
Active Member
Topic starter answered:
RE: PETG - Textured Sheet Adhesion Problem

With a little more reading, I figured out what is going on.  There is a substantial difference in the thickness of the smooth versus textured sheets.  I measured my smooth sheet to be around 1.22mm thick and the textured around .66mm.  I set the first layer to be -1.0 mm and the PETG stuck.

Posted : 24/01/2021 8:32 pm
Sam
 Sam
(@sam-2)
Active Member
RE: PETG - Textured Sheet Adhesion Problem

If solved, maybe you should change this topic into state "solved"... 😉

BR
Sam...
Posted : 30/01/2021 7:31 pm
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