Ratchet
grabcad
The instruction was initially given by a Solidworks instructor, however, I managed to create the same using FreeCAD.
Download Model from grabcad
With this file you will be able to print Ratchet with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Ratchet.