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weight based automatic door closing mechanism — image 1
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weight based automatic door closing mechanism

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automatic door closing mechanism to save some energy during the winter time. Main part fixed by magnets --> reversible

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printed in PLA with standard setting

frame mount needs support

used threaded inserts to fix the spool and round magnets to mount it to the frame (needs to be magnetic) 

the part fixed to the door used a small screw to stay put

it worked fine but my cats didn't like the sound of the wire spinning the spool so I continued my search and came up with a rubber band based mechanism you can find here: https://www.printables.com/de/model/395716-rubber-band-based-automatic-door-closer

 

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