EZ Drill Chuck

This style of adjustable drill chuck (similar to the Dremel chuck) is much simpler than the Jacob's style chuck but it does have one quirk: the jaws move with the tightening ring instead of with the body, and hence, the torque seen by the drill bit makes the chuck self-tightening. But conversely, reversing the rotation (like when backing out screws with a driver bit or when using a left-handed drill bit) will cause the chuck to loosen. So this is really only for one-way drilling/driving/dremelling type applications.That out of the way, it prints and assembles easily. It adjusts from 1/4" (6.35mm) down to 0.045" (1.2mm) and can also be used with 1/4" hex-shank bits. The base has a 1/4" hex socket for connecting to something else, but I've included the STEP file so you can remix it for your own purposes.PrintingUse PLA because it is the strongest (yield strength), stiffest, hardest, and wears best of the common filaments. Print with 0.2mm layers. Note that the ring part prints nose-side