Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4362043.
This case is my design for the Keebio Levinson rev3. I don't have any older revision PCBs so I can't say if it'd work for older PCBs or any Let's Split boards. This design uses no screws so you just press the plate down into the case and to remove it you'll want to use a pen or chopstick to push up on the PCB to pop it out.
You'll need to mirror the files in your slicer for right halves as I've posted only left halves of the case and all plate variants. The different plates are: 2u thumb key with stabilizers, 2u thumb without stabilizers, and a plate that is 100% 1u keys.
Note: I had this posted before but then I realized I had accidentally uploaded my Nyquist files, so if anyone printed my Nyquist design when they were on the Levinson page I sincerely apologize.