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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 a short time in total darkness it actually is pretty bright. Obviously my phone's camera automatically wound the exposure up quite I bit when I took that picture in the dark, though. That was without any special charge-up, just an hour or so of exposure to the largely LED based lighting in my office with it lying face up on my desk.
This is the Overture brand glow PLA.
I whacked it with my little Lumintop single AA flashlight last night and left it sitting on my bedstand, and found that it was still quite visibly (albeit dimly) glowing by dawn the next morning.
Very cool. I'll put some in my cart. My kids will get a kick out of it.