This is a 3D printable Ratchet and Pawl mechanism, designed to allow rotation in only one direction while preventing backward movement (anti-rollback).

• How it works: The spring-loaded pawl (pink part) drops into the teeth of the ratchet wheel (yellow part), locking it instantly if it tries to rotate in the opposite direction.
• Applications: Perfect for DIY winches, winding mechanisms, clockwork projects, or as an educational tool to demonstrate mechanical logic.
• Design: Features a sturdy mounting plate with pre-drilled holes for easy integration into your own projects.

Assembly

1.  First print all objects once.
2. Insert the M3 rod through the hole in the base, place the wheel on it, and secure it to the rod with glue.
3. connect the 2 other parts to the base with M3 bolts use for the purple part the hole furthest from the wheel.
4. Now connect the other hole of the purple object to the red object with a spring.
5. you can connect the base with 2 M3 bolts to something else.