This is largely inspired by https://www.thingiverse.com/thing:5028257 by kageii

This is a stand that achieves a steeper angle then the original feet, while allowing the thumb cluster to stay at any angle. It can also fold completely flat, even with the thumb cluster down, and the keyboard still fits inside the original carrying sleeve without needing to remove the stand.
I went through a few prototypes, and aimed to find a good balance between the amount of plastic required (keeping print time low), and the stability of the whole stand when in use. I'm pretty happy with how stable this is.


Regular stand (100mm) achieves angles between 40 and 50 degrees, while the small one goes from 27 to ~30, stability is much when the stand/feet is closest to the other half of the keyboard (less steep angle). In theory a smaller inclination can be achieved by angling the stand inward, but stability is terrible in that position.
Here are the settings I used, you can fit a full side on an MK3s bed (barely):
The hinge is design to accommodate a piece of 1.75 filament piece, line them up and insert the filament from the front of the hinge.
🛑The holes for the filament came out quite squished and required some drilling, printing slower, with smaller layer height would definitely help with that.
You will need 4 M3x14 (12 to 14 should work) screws, you can also use the original leg screws, and the stand behaves ok-ish with just one per half (at the top, leaving the bottom without screws), but definitely is more stable with one on each side. The M3 screws also make for a more compact look, but as a downside will now require you to have another hex key around if you want to remove them.

5 hours 5 minutes for the whole left side, did a few small changed since that print.
I re-designed from scratch in Fusion 360 all of the part make the stand, included the stl of the central arm between the two stand that I have not modified.
I tried to fix a few issues I had with the original after printing it:
The author remixed this model.