blackbeans

Rotary encoder

You can try to clean its internals to remove oxidation

To me it looks like a lot of manual labor is needed to assemble one, which increases the chance of risks due to human error. There are way better socket designs out there. And for European use I wouldn’t pick any socket that’s not rated for the full 16A.

You must be an American. Stone or concrete walls are normal in many countries.

Youn can indeed use a hammer drill to drill holes. You can buy them for as little as 30 dollars these days. And you can use an angle grinder to make cutouts for cables/tubes, and apply plaster afterwards.

Many houses in the colder regions already have cavity walls with insulation in between the walls regardless of the building method, so I don’t think this method is very wasteful in amount of material.

However, I agree that 3D printing houses had various downsides, such as the weird corners, inflexibility to modify/expand/repair after the initial build and potentiality worse insulation characteristics. I am more of a believer in prefabricated houses, where building houses becomes an industry instead of a project.

69 MOhm is not very likely in a larger housing. Resistors can shift in value but they rarely break without any visual damage.

I would first check for broken solder joints on parts that get warm and check if the relay is performing as intended.