After getting a thinkpad T14 as new laptop i needed a new stand.
I made a similar stand from scratch in onshape based on original stand i used previously

The source: https://cad.onshape.com/documents/b4603029fce80aa833ddb6b5/w/d31272c7850cc73db5b25754/e/527c16f221ea7328d2251756

this is my first attempt to use onshape so it may contain issues

The fit is very tight, so depending on the tolerances of your printer you might need to scale it a bit