This is a DIN Rail mount for an ESP 01(S) including the standard relay module for it.
Depending on how the print comes out, this will either tightly fit or the module can slide out itself. However, you will always be able to align it on the right side, so once mounted even a loose fit should not be a problem.
Supports from the print bed are required. The part is properly rotated for printing. Layer height should not make a huge difference, I used 0.3mm.
The author marked this model as their own original creation.