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I used 18 neodym magnets 9 inside and 9 behind the sink(taped to the backside)
include pauses at 3 hights and insert 3 magnets, To secure them during the print put 3 magnets on the outside at the highest inside magnets.
Be aware of the magnets maximum temperature so they do keep there magnetism.. PLA temperatures wouldn't be any problems but it the ABS temperatures and above there might be some problems..
if the magnets aren't stong enough you can sand off one layer on the back..