Toodler Proof Door Catch
thingiverse
This is flexible enough to bend when closing or opening a door when an adult is closing it, and not break, yet sturdy enough to prevent any doors from opening if in the locked state. Print this on it's side since the layer adhesion will not allow the layers to separate. Make sure to print with 100% infill as this has been the strongest for me during testing. Each one that I have around my home is put to the test at least 20-30 times a day, and they have been holding strong for 9 weeks at the point of upload.
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