I built a self-designed core-xy printer inspired by the Hypercube. The prints come out fine but when I move the extruder I get a rattling sound from the pulleys, mostly from the idlers in the back.
For the pulley mounting I used m3 washers which I sanded down to the diameter of the inner bearing ring of the pulleys. I put these on the above and below each pulley on the screw providing equal distance to the printed part. I hoped to get a clean setup this way by fixating the inner bearing ring without touching anything else. However the movement of the pulleys is not perfectly smooth, tilting slightly when rotating. I suppose the relatively large inner diameter of the m3 washer and the not perfectly round shape after sanding still leave some room for misalignment here.
Is there any better solution for that? Just don't tighten down the screw and abuse it as a bolt?
Apart from that I think there's still an issue with the general alignment (z-height, idler rotation axis being tilted by belt tension or so). I tried to calibrate it using calipers measuring the belt distance from the top of the frame but it's pretty cumbersome. Are there any tips or strategies on getting the alignment right?
Thanks in advance for your feedback.
ps: On the motor side I could fix the problem by fixating the motor vertical axis against being tilted by the belt tension.
pps: This thread seems to describe a similar issue. However it is unclear to me in what way the pulleys were "tapered" to fix the problem.
For the pulley mounting I used m3 washers which I sanded down to the diameter of the inner bearing ring of the pulleys. I put these on the above and below each pulley on the screw providing equal distance to the printed part. I hoped to get a clean setup this way by fixating the inner bearing ring without touching anything else. However the movement of the pulleys is not perfectly smooth, tilting slightly when rotating. I suppose the relatively large inner diameter of the m3 washer and the not perfectly round shape after sanding still leave some room for misalignment here.
Is there any better solution for that? Just don't tighten down the screw and abuse it as a bolt?
Apart from that I think there's still an issue with the general alignment (z-height, idler rotation axis being tilted by belt tension or so). I tried to calibrate it using calipers measuring the belt distance from the top of the frame but it's pretty cumbersome. Are there any tips or strategies on getting the alignment right?
Thanks in advance for your feedback.
ps: On the motor side I could fix the problem by fixating the motor vertical axis against being tilted by the belt tension.
pps: This thread seems to describe a similar issue. However it is unclear to me in what way the pulleys were "tapered" to fix the problem.
