LEGO Technic idle wheel

Title:
LEGO Technic idle wheel

Idle wheel for home-build LEGO Technic robot, with bearings.
Typically for robots with two wheels actuated by two motors.

Features a 3x3 platform.

Printing:
( Slicer software: Bambulab Studio)
(I printed on a Bambulab A1, nozzle 0.4, layer 0.2)
print all parts in the given position
Fill gyroid 30%

Supports:
platform: manual tree supports on the 3 protruding pegs
part1: no supports
part2: manual tree supports on 3 surelevated surfaces

Use a brim for all parts

Insert four 8mm (5/16'') dia steel balls (found on Amazon, ...)

Glue the three parts together

Hazard: not for small children, due to the steel balls.

UPDATE: **********************
Added a 4x3 platform for easier alignment (odd and even settings).