Honeycomb shaped shoerack that is expandable to your needs. Honeycombs can slide and lock in each other to make one structure. Can be stacked from the ground or screw mounted to the wall. The hexagon has a inner diameter of 150mm (5,9 inch) and fits most low to mid height shoes. Depth of the rack is 250mm. Grabbing the shoes out is easy. Prints in 7-8 hours and under 260 grams.

EDIT: added a shorter version (125mm), as suggested in the comments. Removed the wall mounts as the shoes will be sticking out on each side.