- Printed parts (as shown in STL files) - 4x RS 821-396 spring (http://nl.rs-online.com/web/p/extension-springs/0821396) - 2x RS ball bearing 619-0288 (http://nl.rs-online.com/web/p/ball-bearings/6190288/?searchTerm=619-0288) - 3x RS ball bearing 893-7420 (http://nl.rs-online.com/web/p/ball-bearings/8937420/?searchTerm=893-7420) (-> Note: these bearings might not be required! I have been printing for a while now without and that seems to work better than with bearings, as sometimes the filament gets stuck in the gap between bearings.) - Some M3 bolts & nuts (note that you can re-use the bolts of the existing extruder for fixation of the tower to the printer, for mounting the extruder and springs you will need new bolts) - Some wire&shrink sleeves to extend the wire of the extruder motor