Backplate for Honeywell T4 Series Programmable Thermostat - for when your wires are surface mounted instead of poking out of the wall.

IGNORE MY WIRING MARKINGS - YOUR WIRE COLOURS AND NUMBERS MAY NOT MATCH MINE! If you're doing the wiring yourself, follow the instructions in the kit.

Our new Honeywell T4 Programmable Thermostat seems to assume there is a channelled wire in the wall, but ours isn't, our wiring is surface mounted. So I needed a backbox of some sort. I prototyped it in wood first with old scraps lying around, and then designed one for 3D printing.

I didn't quite get the corner radius right! I made the circle a bit too small, so the corners poke out a bit. It takes quite a while to print on my 60mm/s printer, about 3 hours at 0.28mm “extra fast” in Cura in PLA+ with 0.4mm nozzle, and I couldn't be bothered to reprint as the thermostat is tucked away and not very visible. The original radius was 13mm, I've increased this to 16mm for the STL published here, but I've also included the F3D Fusion file in case anyone wants to tweak it further, just edit the sketch and change the diameter of each circle. Also if you have existing screw holes in the wall you might want to draw holes to match rather than drill new holes from this template, up to you.

I used 0.28mm layers for speed, 4 tops and bottoms,  25% infill with grid, no support or adhesion, everything else normal PLA settings, you could use stronger material but this isn't structural or under any loads or heat so PLA is fine.

Please Like this model if you find it useful.

If you REALLY like it, https://www.buymeacoffee.com/gigabeast :o)