Handle with care... or don’t. The only thing this biohazard is spreading is a good spin.

This biohazard-themed fidget spinner combines a bold design with smooth performance. The spinner uses a standard 608 bearing in the center and features three 9mm bearing pockets positioned where the outer rings intersect.

The additional bearings add weight around the perimeter, increasing rotational inertia for longer, smoother spins and a more satisfying feel in the hand. The weighted outer bearings do more than improve spin performance. As the spinner loses speed, they can gently interact with the center bearing, creating a unique mechanical sound that’s almost as satisfying as the spin itself.

For added safety and durability, the three outer circles have been fully enclosed. This eliminates exposed spinning edges while maintaining the iconic biohazard shape.

Features:

Biohazard symbol inspired design
Standard 608 center bearing
Three 9mm outer bearing pockets Added perimeter weight for increased spin time and inertia
Enclosed outer rings for improved safety
Comfortable and balanced spinning action

608 Bearings Amazon

9mm Bearings Amazon

Print Notes:

Print with 3 to 4 walls/perimeters for good strength and durability
10-15% infill is sufficient
PETG is recommended for increased durability and extended use, though PLA works well for general use
Ensure bearing pockets are clean before installing bearings
A snug press fit provides the best performance.

stress relief

Neat Rottis-Bojo (2).stl