There's two main models, base and standoff. Base model has configurations (see model states in Solidworks) for each position if you care about not seeing unused features. If you don't care then the base_default.stl can be used in any position.
Rack is able to have two layers, but will also work as one layer - just print “top” .stls.
Short side of the standoff inserts into the base piece.
Solidworks files for both the base and standoff are also available, have fun :)
Printing recommendations:
happy printing
The author marked this model as their own original creation.