Simple Modular Sub rack (Raspberry pi, visionfive 2, etc)

I built this after wanting to mount a bunch of single board computers and mini PCs into my rack, but not finding any solutions. There are 2U modular rack carriers, but nothing in 3U, which was more suitable for the kind of stuff I'm mounting.

To build this you'll need two 450mm lengths of 1010 extrusion. I used Makerbeam for this, which comes in 300mm and 150mm lengths, I just used one of each and used a straight length to connect them. You can also just buy a single 1000mm length and cut your own, which is probably cheaper.

You'll also want 24 t-nuts, a bunch of M3 5mm screws and a variety of heat set inserts if you're using the included carriers (Everything is m3 except the pi, which is m2.5). I've noticed some inserts have different dimensions than others, I'm using the CNC Kitchen guide for spacing, though some cheaper ebay inserts seem to be a bit bigger. They'll still fit, but you might need to go a bit slower.

Note that the ears in the picture don't quite fit rack spaci