After scaling the NASA ratchet driver from the original 10mm square drive up to a 1/2" square drive (and making a reversible version -- https://www.thingiverse.com/thing:3434855 ), it occurred to me that a plastic 1/2" drive would not likely get much use, since 1/2" drives are fairly heavy duty, requiring more strength than should be expected from 3D printed plastic parts. So here's a 3/8" drive size version, which of course, also shouldn't be used in high-torque applications where steel tools are meant to be used.
The drive is a tight fit to the handle. I used an arbor press, starting the drive into the handle from the print bed side, while supporting the handle part, but with the rotating ratchet part over air (unsupported). This will also break the internal ratchet from the handle, which is what needs to happen anyway. If the end of the driver shaft is slightly bulged you may want to trim or sand it a bit to get the driver part started through the handle part.
0.5mm nozzle
0.2mm layers
4mm wall thickness
40% fill
| NASAratchet-0.375HandleDrive.stl | 671.6KB |
