UPDATE (2016-02-20): Removed some parts - it's now easier to install but still very stable. - 1x 8mm shaft ~363mm - 1x 8mm shaft ~352mm Take care of the tolerance! The original shaft is f8-tolerance (minus-minus-tolerance! it is never exactly 8mm!!!) and it is also hard chrome plated! you may have problems with the ball bearings if you buy e.g. h6... where to buy? well, the supplier of the original shafts is located in germany but asked me to don't tell anyone who he is... if you you wanna really know you will find them on ebay - where they offer other shafts (write an emal as they don't offer the hard chrome plated ultimaker-version on ebay) ;) - 2x 8mm to 5mm flexible shaft coupling (around 25mm long), i suggest metal bellow couplings (not the one in the picture above)! - some screws and maybe washers...