raspberry pi pico case (modified)

There were two design improvements that I felt were needed in the original.

1. the case_upper is supposed to hold the pico board, and the case_lower has no fixing points other than screws. As a result, the sides of the case_lower are very easily pressed and deformed.
2. The screws are sticking out of the case with their heads.

For the second problem, it is not possible to make the screw head flush with the case unless you adjust the height (thickness) of case_upper. So as a solution to the first problem, we changed the design so that the pico board is fixed to the case_lower instead of the case_upper. I think this makes the design more resistant to side pressure.

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