The spool winder is tested only on abs plastic, some adjustment in size on the plugs may be necessary. Print with 0.25 layer high- On the small plugs that is for the drive hole in the spool use 100% infill. - enable the pause plugin in cura on the parts that has nuts inside. - set the pause at 9.5 mm.  – Put glue on the nut and glue it on the paper , cut the paper round the nut so the paper is same size as nut (16mm). – Press the nut down in the part when the printer is in pause mode with the paper up. – max size on nut is 16.00 x 8.25. – Do not force  down the nut, you may damage your printer. If the nut is for tight sand it down in size or adjust printer settings. Good luck… If you want to print custom parts :  drive hole pins cylinder is  15x9.5 and the spool diameter is 51.9