This is for a puzzle for an escape room. Once 4 RFID tags are stuck to the 4 correct grid squares, it will unlock a magnetic lock.
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https://www.youtube.com/watch?v=WYrTtRpXuh8
Prototype of a friction clutch for a clock. The idea is that the power train is coupled to the motion works through this clutch. In normal operation it grips and the hands are turned by the clock, but when you go to change the time, the motion works can slip on the clutch so that you can move it without having to drive the whole against the escapement.
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https://www.youtube.com/watch?v=McyNvgNNA2A
FreeCAD has this frustrating thing where sometimes you try to select an internal corner and you just can not do it. The selection flicks between the two adjacent faces but you can't get the edge.
The solution is to change the display to wireframe mode, but seems like this could be improved.
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https://www.youtube.com/watch?v=5YMTtn51Vqc
I think this is related to the problem of the incorrect normals from Blender - where the normals are correct, the physics works a lot better.
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https://www.youtube.com/watch?v=LLnidRJkD7A