Complements for stevenson screen for DHT11

I needed a support to fix this stevenson screen so I designed one using freecad. You just have to bolt the support to a box (using M3 screws), then put the stevenson screeen on it.
I also designed a washer (named "cale", which means washer in french ;): because I first printed the 6mm version of the screen, then decided to use the 11mm version instead. So, instead of printed again the elements I already printed, I designed this little spacer to adapt the 6mm screens to the 11mm screens.
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