So I have actually been printing in pla+ it is more heat resistant than normal pla and I use uv resistant clear matte spray paint as my final coat. I dont need a hardening agent because I print thick walls and a decent amount of infill so it is already very hard. I have done a couple of drop tests and no brakes so far. My goal with this build was to use as little toxic material as possible (I have 3 kids that dont understand toxic fuems). The most toxic thing in my build is the glue and spray paint.