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