Physics project redesign built for school STEM experiments — 7 measurable improvements over the Thingiverse baseline, including solid-spoke wheels, universal chassis cradles, and an axle string-release mechanism.

Printed holder mounts the Aqara Motion Sensor P1 to standard US 1" × ¼" peg board — quick to reposition wherever peg board is present.

Clip-on holder turns an Aqara Water Leak Sensor into a Christmas tree bowl water level monitor — no more dry trees.