Plinth clip
thingiverse
Here are 29mm legs, using a 4mm channel clip attached to a plinth. I've included a Fusion 360 file, allowing you to modify the dimensions as needed - just edit the sketch and watch the design adapt accordingly.
Download Model from thingiverse
With this file you will be able to print Plinth clip with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Plinth clip.