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SoliForum - 3D Printing Community → Filastruder → Filawinder pulsing
Got my filastruder and winder built up and am really happy with the results of my first batch. One thing I noticed, though, is the Filawinder does not settle in on a smooth constant speed in auto mode, but rather pulses in response to the sensor in a digital fashion. Is this expected? Anyone try to apply a low pass filter on the signal so the motor will instead run at a more constant speed?
It is possible with your approach for there to be times the motor is commanded to run at a speed that is too slow for it to maintain without stalling. There is no downside to running, shutting off, and running again, the loop height is held within about an inch which is what matters.
You can of course modify the firmware as you wish, since it is open source.
Yeah, it doesn't seem to be impacting quality at all. I just thought it would be cool if it could converge on a continuous speed. Maybe I'll give it a shot.
There is no downside to running, shutting off, and running again, the loop height is held within about an inch which is what matters.
I've found the same thing. spool rate is unimportant; keeping the path of the filament consistent is the only thing that matters. The simple dumb winder I made in fact only has on/off control (no arduino). To minimize the pulsing anyway, I tend to adjust the top speed of the motor to match the fastest extrusion I expect to get (plus a little bit more). Since the motor doesn't have to wind as fast as the spool fills up, I can set the speed at the beginning of a session and let it run from then on.
Hmmm. My first batch was done on boxes, clamps, etc because I was impatient to try it out. I have since made a dedicated wall mount and with the different geometries, the pulsing is greatly reduced. Almost winds smoothly/continuously. I guess the filament loop size, exit/entrance angle, etc, influence the overall feedback loop and I was creating an unstable system before. On my new setup the filament loop is shorter with less tendency to swing in response to winder advances.
Looks like Kp=0.01 & Ki=0.002 work well. Now the spool winds smoothly without any pulsing. Again, there is no noticeable difference in the quality of the filament that I can tell. Just looks cooler. :-)
SoliForum - 3D Printing Community → Filastruder → Filawinder pulsing
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