Customizable Delta Push Rod

This is a printable magnetic push rod for delta printers (Rostock, Kossel, etc.). For each push rod you will need:

2x threaded ball (I used these 10mm ones: http://www.ebay.com/itm/281752455687?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT)
2x grub screw sized for the ball thread (I used these M4 grub screws: http://www.ebay.com/itm/182025655220?_trksid=p2057872.m2749.l2649&var=482672531614&ssPageName=STRK%3AMEBIDX%3AIT)
2x nut (I used M4.. Get them at a hardware store or whe