This is a finger control mod for the ES120/ES121 electronic screwdriver, based on an original design by Blair Murphey with nods to a second design from Painless360.
If you need any mods done, or have any trouble, just let me know. It's a really simple design, not a big deal to make changes.
Fun fact: the OBJ comes up as having odd axes in Thingiverse but imports into my slicer in the proper orientation? Someday, long after the end of war and poverty, the world will agree that Z is up and it will be good.
It's pretty hard to screw this one up. Use the thickest walls you can just to keep things sturdy, and the holes will come out a little cleaner if you use support in them or a thinner layer height. That's why I used the 150 micron.
I tapped the holes with a drill-tap, but you can also just run the screw through. The screw goes through the big hole first, so it doesn't bind when you're tightening it! If you want a neater hole, and you don't have a tap, you can always cut a slot lengthwise in the first few threads of an M3 to make a self-tapping screw.
You can use any M3 screw from the other side on the lever, even though it's designed for a pan-head, but it might mar your button over time so maybe put a piece of tape over the button or use the lever from Painless360's design.
I cleaned up the gap between the rings with a razor saw because the support was too sticky and thin. You can use a hot razor blade to separate them, or anything else you've got on hand, just make sure your cut between them goes just a bit past where it transitions into the round part of the ring and you'll be fine.
I saw the work that Blair Murphey did for Chris at Armattan Quads on this type lever, and wanted one. There was a derivative here by Painless360 that I tried out, but it didn't fit all my needs and it's unremixable, so here's my version.
Versus both other designs, I used a split ring so that the tension on the lever and the clamping on the screwdriver can be independently controlled. The main issue I had with the designs was they'd wiggle around or the lever would be too tight, now the thing is never moving again and I can control the lever friction perfectly. I also adjusted the shape of the ring, so it doesn't run into the display - this lets you really torque it down.
I also preferred the screw adjust from Blair's design, so mine is designed for an M3 pan-head screw to adjust the button pressure. I have it set so that it just clicks the button when fully pressed against the ES121 and the spring in the button is enough to lift the lever back off.
Not sure if Blair included a flat on the bottom, but I definitely liked that feature from Painless360's ring and also the lever style with more of a dimple for the finger seemed nice.