M42 Rear Lenscap

by profhankd, published

M42 Rear Lenscap by profhankd Aug 13, 2013
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M42 Rear Lenscap by profhankd is licensed under the Creative Commons - Attribution license.

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This is a simple, but elegant, rear lenscap for M42 "universal thread-mount" lenses. The M42 lens mount was created by Zeiss in 1938 and saw common use in Pentax, Practica, Zenit, and other SLRs until around 1980, but has become popular again because M42 lenses are easily adapted to most digital cameras. The inside of this cap is an easily-printable thread compatible with standard metric M42x1. The outside is a grip pattern similar to that used on the focus ring of many M42 lenses.


Print it; I used PLA. Despite the 1mm-pitch thread, no tweaking should be needed even with extrusions as coarse as 0.3mm diameter! As you can see, it looks cool in clear, too.....

Aside from being a useful part, this was done as a test of my not-yet-released easy-printing metric-compatible thread library....

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99% scaling needed when printing in PLA on properly calibrated printer, 100% works ok with ABS

The trick for making the thread printable does make the thread a tad loose, but it is designed for 100% with a tolerance of 0.35mm (typical nozzle width)... so your shrinking by 0.4mm should make it a tight fit. BTW, I typically print these things between 120mm/s and 200mm/s with 0.25mm layers on my MakerGear M2, so if I don't leave a tolerance, parts often have enough surface roughness to be too tight a fit.

This is the way I'd design it for printing in ABS, and since I print mostly in ABS that's more then cool, but I had only one printer idle with PLA in it when I needed the cap so I did it with that one and it's so loose it just "drops off".. scaled 99% and it threads flawlessly. I already have bunch of them now, will see once I print it in ABS how it works but should be perfect with ABS as it's the amount of "oversize" I'd design in for ABS too :)

btw I recently started a small "foto" project on onshape .. you can find m42 cap there (body cover) :)

Thanks for designing this. The screw threads work really well!

I am trying to find the opposite a bodycap for the Old Pentax SPotmatic