This display was designed to hold up to (15) 1/64th scale diecast cars and was designed in Fusion360
I printed this on my HicTop Prusa i3 at a .25 resolution. Printing with 20-50% infill. Support is recommended just to hold up the slotted parts on the right side display piece.
There might be some slight bowing in the middle at the connection. It mostly depends on infill.
So print, glue together and mount on wall with some screws. Enjoy!