Credit to WhatAMess13 for the original design. I found that the screw locations for the bed mount model in their design did not line up with mine. In the course of playing around with this, I also realized that I didn't like messing around with separate nuts to make the attachment, so I decided to remix the platform to clamp onto the PEI sheet tab with thumbscrews. I designed it to take short M3 threaded inserts and then I used M3 socket cap screws and these knurled knobs.
Printing Parameters:
The author remixed this model.
Changed bed mount to clamp-on design.