Update: Added DXF for CNC or laser cutting in wood. I use the projection function in openscad.
I created this out of a need to modify the file and only having the STL. It's made using the effector code from Johann, I just snipped a little here and there. Most values are hard-coded so call it a work in progress. But I have printed and tested it and it's a nice snap fit. Also, it works with E3D and Makergear V3, but if you have a different hotend, you can modify as needed.
The STL has a 0.2mm layer for printing.
Look at the photos to see how this can be used either a flush mount or recessed. The nut holes may be tight if you don't have your printer dialed in, just bump their radius to compensate.