Greg Wade Belt Bowden Extruder for Delt Bad Boy. Delta Bad Boy: http://www.thingiverse.com/thing:612627 Bearing Belt Wheels for better precision and free run. It can run on 1.75 and 3mm filament A geared Timing belt Extruder, 80 tooth on the extruder and 16-20 on the motor. 20-80 4:1 16-80 5:1 Upgrade with 4mm Lock nut, Belt Wheel Bearing and smoother and stronger print. I used this source. https://www.thingiverse.com/thing:581170 If you use the Delta Bad Boy Mount you have to clean it.... BOM. 1 pc. Complet 1 Print. 30% infill 0.2mm layer 5 pc. 608 Bearing 4 pc. 3x10 mm. Hex socked bolt 2 pc. 4x40 mm. Hex socked bolt 1 pc. 3x25 mm. Hex socked bolt 2 pc. 4mm Extruder spring 1 pc. 8mm Extruder Bolt with low Lock nut 2 pc. 4mm Hex Lock nut 1 pc. 3mm Hex Lock nut. 1 pc. nema 17 stepper motor. 1.8 dec. See link 1 pc. 16-20 GT2 Tooth timing Wheel in Alu. 3 pc. 8mm spacer. Print em or use metal one 1 pc. MXL timing belt. 76-80MLX 1 pc. Pneumatic Connectors PC4-01 1.75mm or 3mm filamentGT2 belt. or 76MXL Belt 95 teeth http://www.ebay.co.uk/itm/76MXL025-95-Tooth-6-4mm-Width-Black-Industrial-Synchronous-Timing-Belt-7-6-/191362979224?pt=LH_DefaultDomain_3&hash=item2c8e1f5598. If U use 20 tooth pully take a 80MXL 100 teeth http://www.ebay.co.uk/itm/80MXL-025-100-Tooth-6-4mm-Wide-Black-Industrial-Synchronous-Timing-Belt-8-/191601549643?pt=LH_DefaultDomain_3&hash=item2c9c57a14b If you want to glue it together, I can make a video for you if you like GT2 Timing Wheels 16 tooth. http://www.ebay.co.uk/itm/2-Pcs-GT2-16-Tooth-5mm-Bore-Aluminum-Timing-Pulley-For-3D-Printer-CNC-/271551239526?pt=LH_DefaultDomain_3&hash=item3f39b71566 Hobbet 8mm extruder bolt. http://www.ebay.co.uk/itm/M8-Hobbed-bolt-for-Prusa-I3-Wade-extruder-Reprap-3D-printer-/161703294207?pt=LH_DefaultDomain_3&hash=item25a64474ff 5 pc. 608 Bearings. http://www.aliexpress.com/item/5-pcs-ABEC-7-Deep-groove-ball-bearing-608ZZ-8X22X7-mm-bearing-steel-608-ZZ-skating/32262758570.html Nema 17 Stepper motor. Minimum like this, bigger is also okay http://www.aliexpress.com/item/free-shipping-17HS2408-4-lead-Nema-17-Stepper-Motor-42-motor-42BYGH-0-6A-CE-ROSH/1324984150.htmlPneumatic Connectors PC4-01 1.75mm or 3mm filament http://www.aliexpress.com/item/2PCS-3D-Printer-E3D-V6-J-head-Pneumatic-Connectors-PC4-01-1-75mm-PTFE-Tube-quick/32462282533.html?spm=2114.10010108.1000014.47.V2ri5E