A Nema 17 stepper motor mount for 2020 aluminium extrusion. I had issues with belt tension on my self built CoreXY-based Laser Engraver and decided to solve it at the motor mount.
Feel free to download the attatched SCAD file and poke around in it. You can edit tolerances, thickness and hole diameters in there. A version for 3030 extrusion should be relatively easy to produce given the project.
Das Filament PLA
When printing in PLA, be sure to use at least 4 perimeters for the shell as I had problems with part strength at lower settings. If you have issues with tolerances, download and edit the SCAD file.