I have done a fair share of PETG printing (20-30 kg) and has given up on printing on glass, it just sticks to hard.
Have changed to printing on PEI instead and that does magic. No need to fiddle with glue or anything to get a good match.
Do yourself a favour and get the flexplate system from Build-Tak makes removal so much easier.
The PEI sheets have been good with most materials I have used (PETG, PETG+Carbon fibre, PLA, TPU)
Mixed results with Nylon+carbon fibre, some good some got loose. Failure might be due to getting lazy not cleaning the PEI after every print since the other materials dont require that.
They have a special sheet for nylon but I have not yet bought one.
Dont use their standard build sheet together with automatic levelling if you are printing on an Ultimaker. They heat the print cores during levelling and that makes the core dig in and destroy the build sheet. Learned that the hard way.
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gr5 2,224
1) When you say "the glass plate broke", did it just loose a tiny sliver of glass?
2) PLA doesn't have this issue where the glass easily breaks (95% of most formulations don't). Nylon doesn't have this problem. nGen doesn't seem to have this problem. It's mostly PETG, CPE.
3) Using a very thick layer of glue (to provide an area that is weaker bond between glass and part) is a good option but indeed the bottom is more ugly.
There are many options. I have been printing a lot of PETg and have just been lucky recently. There are many ways to reduce the strength of the bond. The best way in my opinion is to reduce the squish on the bottom layer just a little. I would just turn the 3 leveling screws the same amount (clockwise as seen from below to move the glass down - away from the nozzle). Maybe a quarter turn. But it takes a lot of practice looking at the skirt (or brim) being printed on the first layer and deciding if it's squished enough or squished too much.
If the first layer is coming out like rope then you are not squishing enough and the part won't stick very well. If it is squished so much it is transparent then it will stick very very well (which is good for some materials but not for petg/cpe). But there is a large range "in between" that is tricky to measure. I don't have a good answer for you.
Hopefully someone who prints a *lot* of PETG has a suggestion for something else on the glass. Personally I print hundreds of petg parts and occasionally lose a bit of glass.
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