Prusa Extruder Reworked.

thingiverse

I wanted a custom extruder that combined the best features of the Prusa design, while avoiding certain aspects I didn't like. This extruder can be fully printed in PLA without worrying about parts getting too close to the body or fan shroud and overheating. I liked the filament drive section from the Prusa but disliked how the hotend clamp and cooling fan attached. In my version, both fans face forward and the hotend clamp comes in from the back. This keeps the front section stable when clamping down the hotend and makes it easy to remove the hotend by simply removing two screws without having to take off any fans. I included a Bltouch mount modeled after the original dimensions, as I believe it's a clone that needs two thin 3mm washers for correct height adjustment. The Prusa 45-degree cooling fan with 50mm blower is used, but mounted directly to the bottom of the cooling fan shroud using 2 x 3mm x 10mm button head allen screws. Mounting is done through the three holes that hold the extruder motor to the body. I've included my mount for attaching to a MGN12 rail-mounted vertical. Use 3 x 3mm x 40mm socket head allen screws for this setup. I use a Duet with sensorless homing, so no provision is made for endstops. Required parts include: 2 x M3x10 button heads (Parts cooler) 3 x M3x40 Socket head for extruder motor/Mounting 2 x M3x20 Hotend Clamp 4 x M3x20 Hotend cooling fan 1 x M3x20 50mm Blower support 5 x Square nuts, available at the linked below. 1 x 625zz bearing for Idler Hobbed Gear: https://www.amazon.com/gp/product/B0798V2GML/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 Square Nuts: https://www.amazon.com/gp/product/B073SBCMBM/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1