This magnet holder takes ceremic magnet with metal partin front of it, it is a replacement part, mine were too old and britle so i modeled this as replacement. I dont know hou about in other places but in Czechia these magnets are very common, especialy in older cabinets.

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I used... PET-G, 0,2 layer heigth, 2 perimeters, and supports and 15% infill.