can you send a link to this glass bed so I can see what it is exactly? Also, when you say Stretchy filament are you talking about some kind of TPU or something?
The glass bed is something like this. Mine has been sitting around forever so it does not have the corners cut. Its Borosilicate. https://www.amazon.com/Borosilicate-130x160x3mm-Polished-Monoprice-Printers/dp/B07FRK6TZX
I had to modify things but this is a basic tutorial for my printer. However, I removed the original printing surface since it was warping under heat and also had to spend a lot of time removing the glue. https://www.instructables.com/Adding-a-Glass-Bed-to-a-Monoprice-Maker-Select-Plu/
The filament I am working with is a flexible TPU. This is the specific one I bought. I did do the mod to fix the printer tonight but I am printing a benchy to make sure I don't need to re-calibrate before trying to print the TPU again. Its currently printing now and will take a while. https://www.amazon.com/dp/B0CP213ZMG
Okay, now I'm with ya. That term Glass Bed was throwing me off. It's a glass build plate. I did not know that such an animal existed, I will have to look into that.
As far as I know all TPU is flexible, that is the draw to it. I use it quite a bit for making gaskets and shit that I want to have "grip". Also, it's tough as balls so you can make really durable shit with it. So far I have not had any trouble printing with it unless it gets any moisture, then it sucks. I dry the shit out of it and I have had real good luck. Also I spray my build plate down with my wifes fancy hairspray and that helps.
Yeah, I know the tricks but its about the feeding system. Ill post some more info sometime this weekend (even if it doesn't work). My entire point is to print a gasket and my printer was not working for it. I have modded the damn thing so much I kind of refuse to let it NOT do something if I want it to.
The "glass bed" has been around since the early days. I do use "Aqua Net" hair spray to make things adhere better (after a proper wipe down with rubbing alcohol). I don't even remember when I bought this printer it is probably around 10 years+ ago at this point. I have modded so much of it that I don't know if you can even consider it the same printer anymore.