Magnetic childproof cabinet lock ring
thingiverse
A magnetic ring to open childproof doors in the kitchen etc... Easier than grabbing the key off the fridge every time you need it. Fits 18mm x 3mm magnet finger whole is about 20mm but I could change it if someone requires bigger. Print with the magnet receptacle facing down and I used tree supports at a 0.12 resolution and 100% infill.
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