Foot for clamping 3030 aluminium extrusion to a desk or surface

I had a bunch of 3030 extrusion lying around from a hypercube project that I was totally going to finish, some day... Figured they might make for a good shelf-extension on my desk instead.

I needed a way to clamp the extrusions down securely, so I made this. It's basically just a little foot that slides on with a gap at the base where a clamp can be clamped.

Screws and T-nuts can be used to attach it securely.

In order to allow for the gap, a minimum height of 50mm is added to the total length of your extrusion-leg. I decided to use this to my advantage and make this parametric, so that I could extend some of my shorter pieces. 

I've included a 50 and 100mm version, as well as step and fusion360 files. To adjust the height, just open it up in fusion and select modify > change parameters.

I first printed in PETG but I quickly switched to PLA in order to print faster. I realized that the design is already strong enough that I didn't have to worry too much about parts breaking. Though there's probably an upper limit to how much load they can take – I haven't reached it.

Mine are printed with 6 wall loops for strength. I used support cubic infill which works very well to save some material on the extended length ones. 10/10 would support cubic again.