This is version 2 of this shelf to display 1:64 die-cast cars, including Hot Wheels, Matchbox, and many other cars of that scale. It mounts with 2 screws 130mm apart and the shelf angled 15° downward, giving it a nice look. The shelf can display up to 8 cars basing them off of being a maximum of 32mm wide and 80mm long.

Doesn't matter if supports are used due to the inside of the lip not being seen easily. If your printer doesn't do bridge gaps very well, you may want to consider enabling supports though.