This is a housing for a phase cut electronic available at the company which delivers smiles.

You can find it here:
https://www.amazon.de/gp/product/B07GWQNNJF/ref=crt_ewc_title_huc_1?ie=UTF8&psc=1&smid=A3MWTOW3Y5FBF1

Safety tip:
Be aware that high power electronic is dangerous! Be sure that the housing is printed well and stable to isolate the electronic properly!
Make sure you have good strain relief!

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