Rostock Max Extruder v2

thingiverse

This is an upgraded version of my extruder. This version uses a 3mm screw to attach the bearing to the lever arm, making it much stronger and virtually indestructible. After experiencing a very high failure rate when printing Ninjaflex, I decided to find a solution. That's when I stumbled upon Singh336's extruder, which was actually quite good and allowed me to successfully print both Ninjaflex and TPU. However, when I tried to print with TPE 80A filament, it jammed in the extruder just like Ninjalflex does with the stock EZStruder. TPE 80A is softer and more flexible than Ninjaflex. I noticed a few shortcomings in Singh336's extruder, so I decided to create my own from scratch. While mine is heavily based on the design by Singh336, it has several key improvements. Benefits: The lever arm won't twist like the stock lever arm. The knob has a flattened spot that perfectly fits the stepper shaft. It comes with a mount for easy installation. The feeder hole is closer and better aligned with the hob roller and bearing. The spring block is positioned closer to the lever, providing a more compressed spring and increased pressure on filament. The filament entry is taller and funnel-shaped, making it much easier to insert filament. All parts can be printed without supports. Suggestions: To ensure the lever arm remains strong and stiff, I recommend using a high infill setting with a honeycomb pattern. The knob may require some filing to fit snugly onto the stepper shaft. Use an 8mm socket and screwdriver style handle to secure the pressure fitting into place. Hardware: 3 - M3 x 8mm screws (mounting extruder to stepper motor) 1 - M3 X 25mm screw(mounting extruder through lever arm to stepper motor) 1 - M3 x 16mm screw (for mounting bearing onto lever arm) 5 - M3 washers 1 - M3 nut (for mounting bearing onto lever arm) 2 - #6 X 1.5 inch screws (for mounting) 2 - #6 locknuts (can re-use original locknuts) 1 - 3x10x4 mm bearing (just re-use the original bearing from the lever arm) Additional note: While I've had a 100% success rate with Ninjaflex and TPU filaments, printing with TPE 80A is still a challenge for me. It's just tough to use filament that soft with a bowden tube setup.