Every year ECIA put a 3D-printable tool online for FIRST Robotics teams to be able to print and use. For the 2018 competition season I designed a 3D printable ratchet for them.
This is the final product pictured with some additional parts in the background.
Pictured is all of the printed parts contained in the ratchet assembly.
This is an early prototype made to test the geometry of the ratchet mechanism itself.