ORDbot PG35L Extruder & X Carriage

thingiverse

This extruder/X-carriage set, designed for the ORDbot, features WildBill's extruder body and has a low weight to keep mass close to the extrusion, reducing vibration and enabling faster movement. However, the free end of the motor output shaft must be supported by a bearing; failure to do so may lead to gearbox failure. A solution is provided in the instructions: drill a 1/2" hole in the far side of the extruder body and glue a bearing inside with hot-glue. The attached files include ORDbot_PG35LExtruder.STEP (a STEP file of the entire assembly), ORDbot_PG35LExtruder.zip (a packed SolidWorks assembly from 2009), WheelPlate.STL (an X carriage STL file), WB_Extruder_IdlerArm.STL, WB_Extruder_Mainbody_R1.STL, Assembled_Frontview.JPG (a picture of the physical assembly showing zip tie routing and details), and Assembled_Rearview.JPG (another picture showing zip tie head location and extruder body mount bolts). The instructions strongly recommend printing the carriage in PLA for better stiffness compared to ABS. The designer initially attempted a belt clamp piece, but resorted to using an M3 screw with an M4 washer to clamp the belt between them without causing rubbing on the extrusion. If the belt clamp block rubs against the extrusion, it should be filed down. The extruder body should be printed in ABS, and both pieces can be printed simultaneously. The motor should be zip-tied to the plate using the provided slots, and the eccentric space should be placed on the bottom wheel for better load distribution. The extruder is mounted with 4 M4 bolts, one of which uses a blind nut trap; this bolt must be cut to length to avoid bottoming out in the hole. A 40mm cooling fan is required for the motor, which can be found at http://store.trinitylabs.com/trinitylabs-micro-extruder-gearhead-motor-and-options/. Hot glue can be used to attach fans to the carriage instead of creating brackets if desired.