I'm mounting some of the Gen2 rails and drawers under a table, but the front of it has a lip. That lip is 3.3mm taller that the short side of a 2x4. I made these shims so that the surface of the wood would line up with the bottom of the table for a smooth transition. There are two holes spaced 25mm from the center of the shim. This is to accomodate screws from the underside. They don't look like they show up in the model, but they show up when sliced.

I rounded the long length up to 89mm as the long side a 2x4 in mm 88.9mm.

PETG 15% infill cubic pattern