This is a wrench I designed to quickly remove standard 10mm prop nuts. Due to the different degrees of shrinkage in different printable materials (filament) I can only verify that this wrench will work when printed in PETT. If you print in other filament the wrench may be too big or too small to fit a 10mm nut. This item is also for sale on my website at http://RcPartsHangar.com.
UPDATE: (12/26/15) Also prints well in PETG and HIPS but HIPS is too weak (IMO) to make a reliable tool and it will wear out quickly.