Aluminium extrusions are common on low-end mini CNC machines, particularly the 20mm square 2020 variety. In some cases, such as my cheap Chinese 1610 CNC machine, they’re used to create the whole framework for mounting stepper-motors, spindle motors, LASERs, controller boards, and all manner of other things. Yet, they’re often left open, basically as cut, at the ends. So, I decided I’d design some simple end caps in OpenSCAD to 3D print: you can see the result in the photo below.
The design is very simple but that makes it easy to print without any supports. Once printed simply push it into the end of the 2020 extrusion to seal and tidy the frame end. And, adding a little paint can make it blend in with the extruded aluminium finish, as in the photo below. So, as I found this design useful I thought I’d post about it so you can make your own: click here to head over to Thingiverse to download the files for 3D printing, as well as the OpenSCAD file for customisation.