Basic foot/endcap/plug for 2020 extrusion

After printing countless feet/end caps for 2020 aluminium/aluminum extrusion, and finding none of them want to fit the 2020 I have, I thought I'd make my own.

This foot locates on the centre hole and side slots.

If your centre hole is 5mm and side slots 6mm wide, give this one a try, it should fit.

There are two versions, the regular one has a chamfer on the side, the "flat" version does not. It also has a tighter corner radius, and is better if you are going to stick a 20x20mm rubber f