A thin layer of glue stick kept petg from bonding to glass for me, but a nice thick layer of G10 is better as long as you heat soak it before printing. I roughed mine up with some sandpaper and haven’t had any issues. Just remember good ppe when working with fiberglass.

In USA I usually get Printed solid’s Jesse and 3D Printing Canada’s Budget PLA. I also pick up a couple rolls of Inland any time I’m by my local Microcenter

Filament sourcing is pretty region specific. Where are you buying from?

I also always have a sharpie on me and often use it to fix the missing labels on these pumps.

Hextraction seems pretty cool.