Summary

This is a cover handle for Elegoo Mars and Mars Pro that doubles as a hook for hanging the cover on the top plate of the Z axis. Mars Pro has a slightly wider Z-axis assembly, so there are two versions. Each version has two pieces, so both can be printed without support. Either glue them to the cover or use strong mounting tape (I used outdoor Gorilla two-sided tape). I printed both in PETG, use enough perimeters that you don't get infill inside thin parts. and enough top and bottom layers that you don't get infill inside flat parts (you'll get infill in the handle, that's ok). Make sure layer adhesion is good, some of the forces are along the printing direction, so raise the temperature if needed. Larger layer height also makes the print stronger.