Originally I printed it on a CR 10 S, i just cut it down to fit on a MK3s buildplate, should print fine if printed without outside line.
I added a positive model of the cut that you can use in PrusaSlicer to load it as a negative mesh and make your own cut in your box or other models… I don't know if it is a bug in my latest PrusaSlicer but whatever model format i try to import it is not scaled correctly… scale it to the provided size to make the correct cut… 213.94mm x 148.75mm x 30mm
The author marked this model as their own original creation.