This is a screw-it-in wall mount for Fastcap measuring tape reels that have the belt clip in the back. It'll probably work with any measuring tape that has a belt clip though!
Put this together in about ten minutes in OpenSCAD... I've included the .scad if you want to customize it but honestly, it's as simple as it looks =)
The bigger the layer height the better. Thicker layers means stronger prints! Crank up the perimeters too.
The author hasn't provided the model origin yet.