A slightly over engineered mount for a TuYa TS0203 Zigbee door sensor - optimized to be mounted with screws (in my case, outdoors, on my fence gates). The top snaps onto the body, but is ultimately designed to work with screws. 

BOM

• A TuYa TS0203. TuYa whitelabels many of their products - a partial list can be found on the Zigbee2MQTT docs. Alternatively you can purchase many of TuYa's products via resellers on Aliexpress - don't pay more than $10 (including shipping).
• The screw holes were sized for #8 screws, I used “Power Pro #8 x 1-1/4-in Epoxy One Exterior Wood Screws”, which can be found at Lowe's (I like Torx way too much). I would guess most #8 screws would work - but I didn't design to a screw spec - just my screws.

Weatherproofing

Note that these Zigbee sensors aren't weatherproof to any degree - to make them mostly weatherproof (only time will tell), I did the following:

• Applied a conformal coating to the circuit board (removed from the case). I used “MG Chemicals 419D Acrylic Conformal Coating” from Amazon. Ensure the battery contacts have been masked with tape.
• Applied a thin (thin is important) layer of Electrical Contact Grease to the battery contacts + battery. I used “NO-OX-ID A-Special - Electrical Contact Grease” from Sanchem (Part# 10203) via Amazon.

In theory, that should be enough - but we shall see (I live in Texas where we get both freezing snow and ice and 100% humidity 110 degree weather).

Printing Notes

• I used HatchBox White PETG filament @ 230C. Only slight brushing at the seams were needed.
• I printed using a Prusa Mk.4 with 0.10mm layers (3 perimeters), 30% infill (I used grid, but it doesn't matter). Should be a rather easy print, nothing special is needed.
• The model has an assume tolerance of 0.2mm.