Thermostat Holder Replacement (HM-CC-RT-DN, HmIP-eTRV-2 and similar)
Description
This is a replacement for the coupler that connects the thermostat to the radiator. It is designed for the Homematic HM-CC-RT-DN but this part is apparently also used in the HM-IP-Version of the device and by some other brands. I did not test this with anything else but my Homematic-Thermostat. The original part becomes incredibly brittle over time and the retaining tabs break off. There is a replacement kit, but it is costly and includes a lot more parts than necessary. There already is a version of this part on Thingiverse, however: it has a misplaced stop-barrier (which might actually not be a problem) and the thread pitch and diameter seem to be wrong. It has to be a non-standard 1.75mm pitch. So I decided to remodel the whole part from scratch. You can print this part in the given orientation. But it is recommended to rotate it, so it sits on the (relatively) flat side, somewhat like shown in the images I provided. The reason is that the part is so much stronger then, and the tabs will not break when you put on the union nut. The downside is, that you will probably need to carefully clean up the thread in the middle so the cogwheel can turn easily. I did that with a hooked deburrer. If printed in the upright position, you should pe prepared that you might break off a tab when putting the union nut on. The thread should be perfect, though. As for the material I would say that PETG will do. Good PLA, PLA+ or filament with carbon fibres might be fine, too. Lastly I would recommend to put some grease in the thread and in the hole for the small cogwheel. I hope this will help you.
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