I wanted to print the involute blower, which is very cool (Thanks Benjamin) but I didn't wan't to run to the store to pick up some M8 bolts, nuts, and washers. This kit includes enough hardware to assemble the project including the handle from one of the other remixes. Print at 40% fill or better. A real bolt for the crank is still recommended for regular use. This hardware was generated using the excellent customizer script from NUT_JOB http://www.thingiverse.com/thing:193647PLA, 40%