This model was inspired by a user on a discord server who was asking if anyone had an STL for a geometric panel they had seen online
This panel is 128mm x 128mm by 13.90mm, the corner connector is 128mm x 10mm x 10mm
The 2 panels with holes for magnets and the connector feature a hole for fitting a 3mm x 2mm sized magnet and the holes have a small tolerance of 0.3mm to account for 3D printing, the panels feature 2 holes along each side so you can connect these panels in any direction and the corner connecting piece features magnet holes along both sides and the top and the bottom to allow you to stack these vertically
This was modelled up in Fusion 360 and the .f3d is included if you want to edit the panels to your liking