Ball-Bearing Ratchet Screwdriver

This 3d-printable ratchet screwdriver is very strong, as it uses metal 4.5mm airgun BB's instead of plastic catches. The mechanism turns freely forward, locks solid backwards, see the video. It has a 1/4" hex in the axle for screwdriver bits. You could also use it as an overrunning clutch.

 Name                           Last modified      Size  Description
 Parent Directory                                    -   
 spragg5-hub.stl                2016-02-23 09:21  485K  4-ball Hub Only
 spragg5.scad                   2016-02-23 09:21  2.1K  Source code, needs util.scad
 spragg5-fixed.stl              2016-02-23 09:21  840K  Complete Parts, 4-ball Version
 spragg5-hub-nospring.stl       2016-02-23 09:21  428K  
 spragg6-hub.stl                2016-02-23 09:21  668K  6-ball Hub Only
 spragg6.scad                   2016-02-23 09:21  2.1K  Source code, needs util.scad
 spragg6.stl                    2016-02-23 09:21  1.1M  Complete Parts, 6-ball Version
 images/                        2017-01-10 19:04    -   Image Pile
 util.scad                      2017-09-12 19:53  8.8K  

Instructions

It prints in 3 pieces - the axle and two halves of the case. Fit the six BB's into the axle as you slide it into the casing, then glue on the lid.