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I spent a few late nights designing this as a fun project, trying my skills and just trying to get this as good as possible.

To make this, you need:

to print all parts (.3mf files supplied for orientation and settings I used).
you need some M3 screws, a few of them countersunk.
1 battery holder for 2x18650 batteries (~75mm x 40 mm dimension).
1 x arduino nano.
2 x 9g servos.
a few wires and tools to solder.
2 x toggle small switches.

Code:

All code at this point is based on the code found here, but with some modifications.
I do plan on doing more changes, like adding random actions, knocking etc.
after assembly, you may need to adjust the top and bottom positions to make the arm move correctly, and to make sure the lid get closed properly.

Assembly:

do not tap threads in the parts, some parts need the friction to keep the screws in place without tightening them too much.
The arduino has 4 pins in the \u201cbox\u201d to keep it in place, put it there and heat the pins to make the dev board stay in place.
both servos has mounting points in the \u201cbox\u201d, use the screws supplied with the servos.
both servo arm attachments has pins going trough the supplied \u201csingle arm\u201d attachment, these can also be melted to keep it in place. A slightly longer screw than supplies is also needed.
all parts can be mounted before the \u201cright wall\u201d is installed.
in my case, the toggle switch I had was to stiff for the servo to toggle, so i ended up taking it apart and shorten the spring in it to get it less stiff.

Questions?

Just ask me if you need support, want step models or whatever!

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Useless machine

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