Machine Knob

i have made it to replace the knobs of a machine, it has a hex hole inside to put a 10mm nut inside that is the most used in Machines, and a cap to cover the hole. you can print it whitout support matterial and i think you must set 50% infill density. i made it on freecad and inkscape. if you want the freecad file send me an email to goferreyra@hotmail.com