This contraption solves a problem that i have, with lack of available space in my setup!
It holds the cover of the Mars at an angle that allows total access to the build plate.
You need to replace the gantry cap with the Base.stl, using the same screws. The adapter can be stored inside the printer, it "clicks" on top of the base.
I recommend that you install the handle from https://www.thingiverse.com/thing:3749185 as it makes handling the cover much easier.
Print the files as they are, with supports. Use at least 4 bottom and top layers and 3 perimeters.