Update 12-27-2021: I need to redesign this for a new apartment. The V2 models are slightly different and I hope it makes them more universal. The threaded stem is now 20mm longer and the cap is now more of a Nut. The stem should now poke through the back of your peephole by a few millimeters and you basically clamp the adapter to the door with the nut. Should enable you to use this in doors that have some kind of knocker as well (mine does). The stem is also more properly secured to the base with proper fitting joints and chamfers.

Designed to give the Nest Hello the same ability as the Ring Peephole camera, so that I can use it in my apartment without drilling holes and breaking rules.

The stem is about 42.5mm long and the cap stem is about 20mm tall. Designed to mimic the peephole in my actual peephole, the backplate stem is long enough that it nearly reaches the end of the hole, but not all the way there, so the cap fits in and screws down the stem, leading to a very snug fit. There is one thru hole for cables for an AC adapter to fit into to power it.

This is the adapter that I bought to use. https://www.amazon.com/gp/product/B07DJ7RHS5/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

The thread tolerances were modified to fit my printer, so you may need to adjust them for yours.

The lip/clip that is flush with the edging goes on the bottom of the camera, otherwise it's a very "easily-disconnected" grip and could pop off very easy.

Printed in any color, but I used white to match my door as best as I could :).

I'm not sure how licenses work, but you are free to modify the design as needed to fit your door or anything other update you can think of, just so long as you don't sell it for a profit without my approval is all.

Update 5/16/20 - Added protrusions on the top and bottom to give it support when pressed so it reduces any likelihood of snapping

Prusa

Doesn't Matter

.2