Hot Wheels Tower

I designed a rotating display tower for Hot Wheels cars. Each car bay measures 100 X 50mm, the total unit footprint is 180 X 180mm, and each floor is 50mm high. The display rotates on a single 6201Z bearing. Print one each: top section, base, pivot block, and knob. Print as many floors as you need for your collection. Start by pressing a 6201Z bearing into the base, slide the pivot block into the bearing. Place a floor onto the pivot block, then add as many floors as you want. Finally place the knob on the top section, then add that assembly to the top of your highest floor.