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I'm finally getting around to messing with this stuff. Now I can balisong in the dark.
Step 2 is determining how badly all the particles of gumf in this filament negatively impact the mechanical strength.
Edit: I probably should have said this in the first place, but this is Overture green glow PLA.
The model is my Rockhopper balisong utility knife. Go check it out -- it's fully printable, even the hardware.
For strength there are some decent GID PETG options. Glow for all these is pretty good with regards to intensity but poor for duration. Be ready to replace your brass nozzle a little sooner than you thought. Using a oxbidian nozzle and it seems to take the beating well.
I have a diamond nozzle installed already.
PETG's issue in this particular application is layer strength, wherein it's difficult to top PLA except with some semi-exotic and rather hard to print materials like polycarbonate. Both the screws and the blade carrier in my design rely on layer adhesion not failing for durability. Otherwise honestly the parts are all pretty low stress other than I guess potentially the pocket clip.
I got really good results with CC3D GID PETG and a steel nozzle.