Improved version at http://www.thingiverse.com/thing:305215 Parts to convert a PrintrBot Simple with a direct drive extruder (not aluminium) to make use of a Bowden tube. No changes to the Simple itself are required (no new holes etc.). Motor and extruder are mounted on the Z axis support bars. All parts are sized to be printable with a Simple. UPDATE v2: Redesign of extruder and extruder model support so that the extruder unit can rotate as required to alleviate pressure on the bowden tube as it bends. This has allowed the tube to be less than a foot long. Extruder fitting is an adaptation of the Internal filament guide for Printrbot direct drive extruder by rswarner. The Hotend fitting is an adaptation of one of the fittings in Printrbot Simple Bowden conversion by owens to make it fit the new extruder location. Print 1 of each component, apart from the flat disks where 2 are needed. The hotend block screws into existing holes at the end of the Simple Y axis arm and the hotend mounts using the existing screws. New screws are needed to attach the block. The printed fan mount fits using one of the screws used to attach the hotend block. The extruder fitting replaces the hollow plastic tube and the small wooden component in the extruder assembly. The push fits screw into the hotend block and the extruder fitting. The new extruder support fitting requires printing 2x flat disks and 1 support. The disks go either side of the support aligned with the hole and the extruder assembly is screwed to the motor through the disks. This allows the assembly to rotate as the Y axis arm raises and moves. The hole through the hotend block corner is to allow the cables to be cable wrapped as per the normal setup. There is also an extra screw hole in the block to allow the hotend to be firmed up if it isnt firm initially (i havent needed this, so skip if it works ok for you). Additional components: 2x 25mm (or longer) M3 bolts with nuts will be required to attach the hotend component. PTFE tube (4mm outer, 2mm inner) and push fittings needed to attach the tube to the fittings (self threading). The push fittings i sized it for can be found at http://www.amazon.co.uk/gp/product/B00H53FYHE/