Stplit strap adjuster, 20mm straps

thingiverse

Based on https://www.thingiverse.com/thing:2636310 (which I think is made for 1" straps). I shortened the mid section to fit 20mm straps. I found that the standing version in the original did not slice well for me (in Cura, one of the pin slots tore through the outer shell), so I only made the flat one. I also believe the flat one has better mechanical strength because of the way the plastic is aligned. Prints well on Ultimaker 2+, very snug fit for the pins.