I just bought an Homematic IP BWTH floor heating theromostate just to find that they don't fit into my power socket row by Gira, which has outer frames for 70 x 70 mm - where this thermostate has 55 mm edge length. So I made this thing to fill that gap. And it looks nice if it matches your rooms main color (I have sky blue for the children's room and green walls in the kitchen). You can print without any support. The two small hooks in the middle make the thermostate pin the frame down so it does not move around.
Homematic_IP_BWTH_Frame_55_to_70.stl | 169.6KB |