MPSM V2 Improved Extruder (WK9)

thingiverse

###WK9 Extruder\r\n####MPSM V2 Extruder Replacement.\r\n#####Wiley Kyoto\r\n___\r\nThis extruder upgrade is designed to seamlessly integrate with MPSM V2 stock hardware, produced from mid 2017 onwards. The only exceptions for parts are the Bowden tube fitting and bearing screw. One of the primary reasons for upgrading is that the stock Bowden tube fitting is not a standard part, making it difficult to replace when it breaks. Additionally, the stock extruder arm is prone to breaking at the point where it holds the bearing in place. This new extruder has been engineered to work with a PC4-M6 Bowden Tube Fitting and an M6 nut, replacing the unusual stock fitting. Optionally, you can use a bowden fitting with the extruder arm (see WK9_Extruder_Arm_Bowden.stl for this option), if you have a Bowden tube running to a dry box. This extruder is also designed to work with a 10mm long M4 screw, which holds the bearing in place securely. You can easily find a PC4-M6 fitting online and locate an M6 nut and M4 Screw at your local hardware store. The M4 screw could also be replaced with a #8 x 3/8" imperial machine screw.\r\n\r\nStock parts to be retained:\r\n- M3 Stepper Mounting Screws\r\n- Arm Bushing\r\n- Spring \r\n- Bearing (4x11x4)\r\n- Feeder Gear\r\n\r\nParts required for replacement or upgrade:\r\n- PC4-M6 Pneumatic Straight Fitting, for 4mm OD tubing. (x2 if you use WK9_Extruder_Arm_Bowden)\r\n- M6x1.0 Nut (x2 if you use WK9_Extruder_Arm_Bowden)\r\n- M4 Screw, 10mm long. (or #8 x 3/8" Imperial Machine Screw)\r\n\r\n___\r\nImportant notes:\r\n\r\n- This extruder was printed with PLA (Hatchbox - Pantone Yellow C), using a layer height of 0.175mm, wall thickness of 1.05mm (with three shells), 20% infill, no supports, and no raft.\r\n\r\n\r\n- To print just the replacement arm, you'll need an M4 screw 10mm long in addition to any other required parts.\r\n\r\n\r\n- The Extruder Cap comes in four different tolerances. I recommend using the one with the tightest fit as it provides proper support for the bearing. I used the .00mm tolerance version, and it snapped securely into place. In your slicer (top down), you'll want to flip this part over.\r\n\r\n\r\n- The Extruder base features a 4mm hole leading up to the slot that takes the M6 nut. This allows for a small length of PTFE tubing (<20mm) with a V-shaped point, which can be placed between the drive gear and bearing (without touching). This guides the filament through the extruder and enables printing flexible filaments like TPU.\r\n\r\n- The Motor Spacer is only necessary if your motor sticks out too far from the hole in the chassis. In this case, adjust the vertical scale in your slicer to make it as thin as needed. The part itself is 2mm thick, so if your motor sticks out 1mm, set the z-scale to 50%. Be aware that this may affect the alignment of the extruder gear with the bearing and filament path. You might need to slide the extruder gear farther in or out accordingly.\r\n\r\n___\r\nAcknowledgments:\r\nA big shoutout to [robin7331](https://www.thingiverse.com/robin7331/about) for his [MPSM Extruder Baseplate V1](https://www.thingiverse.com/thing:2029972), which inspired the idea of making a slot for a nut that works with a PC4-M6 fitting.