Rotating base for 16 (plus optional extra 2) precision screwdrivers, no bearings needed, since the contact point between the base and the spinner is a 3D printed conical tip.
The outer ring is for 8 (3mm diameter) screwdrivers, while the inner ring is for 8 (4mm diameter) screwdrivers.
The large center hole at top can be left as is for large items or can be replaced with the 3D cap, that will allow storage for 2 additional screwdrivers with 4mm and 5mm diameter.
The author marked this model as their own original creation.