Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2148891.

This converts a small microswitch into a slide switch. It's designed to suit a 20mm wide microswitch (20mm x 10mm x 7mm / 0.78" x 0.4" x 0.3") with 2.5mm diameter mounting holes.

The overall size of the printed switch body is 40mm x 30mm x 15mm, and it has two 4mm mounting holes, which would be suitable to mount directly to 2020 extrusion. The top can be secured with M3 screws and nuts, and there's also a 4mm hole in one side for cable access.