Belted Bowden Extruder with Filament Runout - v1

thingiverse

Remix and enhancement of hobie77's "Geared Bowden Extruder v2".\r\n\r\nRe-designed package to use a 25mm screw, added a cage/outer support for large pulley, filament runout sensor, and PTFE fittings.\r\n\r\nCalibrate E-Steps using Bowden method: https://www.matterhackers.com/articles/how-to-calibrate-your-extruder?gclid=CjwKCAiA0uLgBRABEiwAecFnk3e6VjFFCSB7xtvScKdYE5XQoA07qt6EHpYdsgl6DzogomQuEsX0eRoCaWUQAvD_BwE\r\n\r\n09may2019 - Updated middle to rev4 and arm to rev6. Moved the filament path in middle part down and towards the back to interface with MK8 hobbed gear better. Increased length of moment arm from 20mm to 22mm. Adjusted spring pre-load from 5mm to 7mm. This also allowed for the arm to be thickened further from previous revision. Added info block on Acceleration and Velocity Settings for high-speed printers.\r\n\r\n15may2019 - Running into some underextrusion issues when printing 0.3mm layer height at 120mm/s print speeds. Working on some middle and lever modifications which will provide better gripping to the MK8 gear and more torsional pressure for the lever bearing. On a positive note, had little issues when printing 0.2mm layer heights up to 160mm/s. Updated material for large pulley to PETG since the PLA pulley failed.\r\n\r\n29apr2019 \r\n- Release v3 which has a fixed stepper and spring loaded idler to tension the belt: https://www.thingiverse.com/thing:3394722\r\n- Created a 1/2" Dia. x 50mm Long Axle: https://www.amazon.com/gp/product/B01B27MJC6/ref=oh_aui_detailpage_o00_s03?ie=UTF8&psc=1\r\n\r\nBill of Materials:\r\n4 - M4x25mm screws \r\n4 - M4 nuts \r\n5 - M3 nuts - 4 inserted in Top_Part and 1 in pulley\r\n8 - M3x8 SHCS - 4 for cage and 4 for stepper\r\n1 - M3 set screw - pulley\r\n4 - M3 washers - (optional)\r\n1 - M5 washer - (optional)\r\n1 - GT2 Timing Belt - L=158mm W=6mm 79 Teeth in Closed Loop - https://www.amazon.com/gp/product/B014QKEH26/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1\r\n1 - MK8 Drive Gear - https://www.amazon.com/gp/product/B07792SHML/ref=oh_aui_detailpage_o00_s01?ie=UTF8&psc=1\r\n4 - 625ZZ Bearings - https://www.amazon.com/gp/product/B07DZYZM86/ref=oh_aui_detailpage_o00_s02?ie=UTF8&psc=1\r\n1 - GT2 Pulley - 16 Tooth - https://www.amazon.com/gp/product/B01IMPM44O/ref=oh_aui_detailpage_o00_s03?ie=UTF8&psc=1\r\n1 - 5mm Dia. x 50mm Long Axle: https://www.amazon.com/gp/product/B01B27MJC6/ref=oh_aui_detailpage_o00_s03?ie=UTF8&psc=1\r\n1 - 7.5mm Dia. x 10mm Long Compression Spring: https://www.amazon.com/gp/product/B01N6RMGD2/ref=oh_aui_detailpage_o00_s03?ie=UTF8&psc=1\r\n2 - PTFE fittings - https://www.amazon.com/Straight-Pneumatic-Fitting-Fittings-Filament/dp/B079SCZZXD/ref=sr_1_12?ie=UTF8&qid=1544981148&sr=8-12&keywords=ptfe+fittings\r\n1 - micro switch - https://www.amazon.com/gp/product/B06XFL4MZ2/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1\r\n1 - PTFE Tubing x 30mm long - trimmed in runout sensor box during assembly.\r\n1 - Wire/connectors for integrating switch to controller.\r\n\r\n60T Pulley design: https://www.thingiverse.com/thing:16627\r\n\r\nFilament Runout Instructions AnetA8/Marlin/Octoprint: https://www.thingiverse.com/thing:3143558