Fridge Lock
thingiverse
My 3-year-old like to take sweets from the fridge. So i made this look. If it is glued it with Tesa power straps high enough on the fridge the kids can not open it anymore. In addition to the 4 parts you need the spring from a pen and a short piece (same length as the uncompressed spring) from the ink tube (ideally you cut it on the back end - there should be no ink). This design is made for a spring with an outer radius of about 4mm (as I found it in most pens). The video shows it in real life: https://youtu.be/BFEg5-z_P6o Have fun :-)
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