MPSM V2 Improved Extruder (WK9)

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WK9 Extruder\n\nMPSM V2 Extruder Replacement.\n\nWiley Kyoto\n\nThis is an upgraded extruder designed for use with MPSM V2 stock hardware (mid 2017 - Current). The only exceptions to this design are the Bowden tube fitting and bearing screw. Upgrading to this extruder addresses the issue of the stock Bowden tube fitting not being a standard part, which can cause problems when it breaks. Additionally, the stock extruder arm is prone to breaking where it holds the bearing in place. This extruder replaces the old stock Bowden tube fitting with a PC4-M6 Bowden Tube Fitting and an M6 nut. Optionally, you can use a bowden fitting with the extruder arm if you have a Bowden tube running to a dry box. This extruder also uses a 10mm long M4 screw to hold the bearing in place. You can easily find a PC4-M6 fitting online and an M6 nut and M4 Screw at your local hardware store. The M4 screw could also be replaced with a #8\n x 3/8" imperial machine screw.\n\nStock parts:\n- M3 Stepper Mounting Screws\n- Arm Bushing\n- Spring \n- Bearing (4x11x4)\n- Feeder Gear\n\nRequired parts:\n- PC4-M6 Pneumatic Straight Fitting, for 4mm OD tubing. (x2 if you use WK9 Extruder Arm Bowden)\n- M6x1.0 Nut (x2 if you use WK9 Extruder Arm Bowden)\n- M4 Screw, 10mm long. (or #8\n x 3/8" Imperial Machine Screw)\n\nNotes:\n\nI printed this with PLA (Hatchbox - Pantone Yellow C), 0.175 Layer Height, 1.05mm wall thickness (3 shells), 20% infill, no supports, no raft.\nIf you just want to print a replacement Arm, the only extra part you'll need is an M4 screw 10mm long.\nThe Extruder Cap comes in 4 different tolerances, I recommend using whichever fits in the tightest, as it helps properly support the bearing. I used the .00mm tolerance version, and it snapped securely in place. You'll want to flip this part over in your slicer (top down).\nThe Extruder base has a 4mm hole leading up to the slot that takes the M6 nut. This is designed so you can put a small length of PTFE tubing (<20mm), cut with a V shaped point (when looking from above), so that it nestles in between the drive gear and bearing (without touching). This helps guide the filament through the extruder and will allow you to print flexible filaments like TPU.\nThe Motor Spacer is only if your motor sticks out through the hole in the chassis too much. Adjust the vertical scale in your slicer to make it only as thick as you need. The part is 2mm thick, so if your motor is sticking out 1mm, set the z scale to 50%. Warning, this may affect the alignment of the extruder gear with the bearing and filament path. You may need to slide the extruder gear farther in or out accordingly.