'Sine wave' deviation in X-Axis on moving bed printer.

Cees Meijer
  • 'Sine wave' deviation in X-Axis on moving bed printer. Cees Meijer

    I've built a a PrintrBot inspired printer with a moving printbed for the X-Axis movement. It's controlled by a RAMPS board running Marlin firmware. And there is a problem with the X-Axis positioning. Four S-Shaped blocks

    As can be seen in the image the X-Axis is not really stable. The blocks should be 10x10x10 mm, and the top and bottom are perfect. The waving does not appear in the Y-direction, it's only in the direction of the bed movement.
    Each block was printed at different speed, from medium to dead-slow. I limited the acceleration and in the last block I also limited the non-printing speed so the bed would never experience a higher acceleration than with the printing itself. But the wave effect remains. And it's also remarkably repeatable so it looks more like a synchronisation error somewhere. Does anyone has a clue, or experienced a similar effect ?

  • This is the issue of your z-axis rather than x- or y-axis because printing speed doesn't have any influence on the results.

    I bet:

    • your threded rods are bent or
    • nuts on these rods have too high clearance or
    • nuts on these rods have eccentricity or
    • couplings (between motor and threded rods) are bent or
    • these couplings are badly fitted

    All above suggestions concern z-axis.

    [edit] because it's PrintBot its z-axis has the following disadvantage

    enter image description here

print-quality marlin
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