Finger washer and shoulder nut holder--parameterized
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Openscad model with customized finger size for shouldered hex nut and washer for hard to reach places
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A fingertip nut and washer holder is what I needed to re-assemble an expresso machine that has two, very-hard-to-reach fasteners and each includes a shouldered hex nut and a washer.
My finger is large so I made an OpenSCAD model with parameters to be able to customize the following:
//Finger diameter near joint
//Finger diameter near tip
//Length of finger joint
The other parameters included are:
//Hex nut diameter--measured across the points, not the flats
//Hex nut thickness
//Hex nut shoulder diameter
//Hex nut shoulder thickness
//Washer diameter
//Washer thickness
//Wall thickness
I recommend making the diameters 0.1-0.3mm larger.
I haven't experimented much with the parameters but they should work for your application. The only known limitation of the parameterization is that if thicknesses of the nut and washer vary at all, their position needs to be adjusted manually in the translate commands.
I printed mine in PLA with a 0.6mm nozzle and 0.3mm layer height. It was printed with the fingertip end on the build plate and with supports only from the build plate.