This is actually a print of waldamore's modified files but as he said, the design is by walter
Waldamore's reduced version: https://www.thingiverse.com/thing:2381858
I have been printing these as fast as I can, 3 at a time, for weeks now because my students have gone crazy for them. I charge them a couple bucks each to pay for the plastic and things are booming! Thanks for the great design!
MG Chemicals PLA
I'm pretty sure I'm using the .25/.25 version