Summary See how I am going to include the HunchBack Bowden Extruder into the WIP 3D printer I am designing at Sketchfab: https://skfb.ly/LPP7 I need an extruder that would comply with the following requirements: has a wider foot and most probably will fasten to its support under the motor (due to special space constrains); uses all four bolts to the motor; will grip the filament very close to the motor (to take off the lateral stress from the bearing); will be easy to open the Idler arm without unscrewing; will be optimized for a top*down positioning thus filament will come from below and the bowden will arch at 45 degrees, maybe reducing some length. This is still in designing phase but placing it online will allow me to receive comments and suggestions. Some more details about this extruder: printing this thing vertically is possible but I wary about the rotational forces exerted by the motor when spinning, forces that tend to delaminate the layers (I can provide a version without the backoriented side of the foot, which will make it easy to be printed flat on the bed) there is a retaining M5 nut at the push*fit fitting which has quite little space to be inserted, so that could be a stretch (again, I can provide a version without the niche for the nut) the Idler looks and most likely is somewhat heavy/massive due to the fact that I needed to offer some support for the other side of the bearing shaft/bolt, the one closest to the motor, which is un-supported and will bend. The original extruder had many problems with Idlers breaking due to uneven forces and ultimately updated the design. The "canopy" of the idler extends towards the motor and provides a surface against which the "shaft support thingie" -whatever it might be named- can press when the the tension bolt is tightened.