Ergonomic Pin Vise Drill Knurled handle

Note: The egg-shaped handle grip spins independent of the body. It is not a requirement for this model but makes for a more comfortable grip. One can resize the egg to one's own hand.

This was inspired by an old craftsman Ergonomic handle ratchet that I used to own. If you print it using “Fuzzy Skin” surface for the Egg-Shaped handle, you get a nice textured grip. The dimensions for the handle were taken from an egg I had in the refrigerator which seemed to be about the right size. 🥚 Note: The Egg-shaped handle is optional, the real work is done by the Knurled shaft.

• Use M3x6 or M3x8 Screws to fasten. I undersized the holes and recommend that you use a 2.25mm - 2.5mm bit to drill out the holes for cleaner grip. Self Tapping screws are ok.
• Use 6X wall thickness for the screws to have something to grip to. 
• Printing on a smooth plate will allow for gluing of the two halves for a permanent fit. 

Here are two examples on Amazon that I used but this is a ubiquitous device that can be found online anywhere under the search pin-vise.

https://a.co/d/isUO4Dm

https://a.co/d/hNf983G

For those who want to try out there own efforts in CAD, here is the ONSHAPE files with Parametric values to change the dimensions to fit other hand sizes.

https://cad.onshape.com/documents/76785058786cd0dfc3cbfabf/w/eabcefc6807676c4214f5b70/e/754b2ca8238ade1a42485bef

Note: Use the ONSHAPE export feature to export the modified model to either an STL or STEP file. STEP files are more accurate and print better.