Coldkennels
Barnack-toting Brit.
I just wanted to make a quick post to praise Simon Forster of simonforsterphotographic.co.uk. He 3D prints bespoke and custom lens caps (including a bunch for obscure/awkward lens mounts like the Contax RF one), so I contacted him on Twitter (@SimonFor) to see if he could knock me something up to protect the viewfinder of this Focoslide in my camera bag. After all, there's no filter thread to snap a modern lens cap onto, it falls right between most of the common push-fit sizes, and (correct me if I'm wrong) Leitz never made their own lens caps for these.
After confirming he could knock something together, I took a couple of measurements with some vernier callipers for him, paid £10, and within two days this turned up in my letterbox - an absolutely perfect fit.

If you're looking for (and struggling to find) any sort of lens cap, definitely give him a shout.
After confirming he could knock something together, I took a couple of measurements with some vernier callipers for him, paid £10, and within two days this turned up in my letterbox - an absolutely perfect fit.

If you're looking for (and struggling to find) any sort of lens cap, definitely give him a shout.