Hi,
I´m trying to understand the extruder mechanics better. At the moment I´m using a no reduction type with NEMA 17 motor with MK7 driver gear. Which is working fine until I noticed some regular spaced (every 1.5mm) gaps in my prints at higher speeds (>50mm/s). Every 1.5mm (the pitch of the threaded rod) and printing at 85mm/s I get one deteriorated perimeter which curls up, when I slow down to 30mm/s the spacing is perfect.
That got me thinking about whether or not the extruder is up to the task at higher speeds. What I never understood about the Wade style extruders is the relatively big reduction ratio. I get that clamping the drive gear hard into the filament builds up resistance on the shaft but so much thats it needs such a big gear reduction to overcome it? I also read the the higher speed that the motor now has to run on makes it more likely to skip steps.
So my idea get to higher speeds is more pressure on the filament (which is a weak point on my extruder) but before I do that my main question is what speeds you guys use with direct driver extruders?
