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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@halemmerich
The 3D print service (JLC3DP) accepted the file (warned me of thin walls but I took the risk) and it seems to be in production now. Scheduled to be sent out in 4 days. I have no idea what to expect but hoping for the best :) The whole thing was surprisingly affordable. About 13€ shipped in 316L stainless steel SLM.
Thanks to @Gordon for the detailed watch body file in https://forum.espruino.com/comments/17414317/. That will help me with designing a backplate that can house the HRM sensor. If I can get it out of the original case without destroying it...