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Bead width varies with print speed

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Posted · Bead width varies with print speed


I see the bead width varies with print speed and I'm looking for an explanation.



The object:


  • materiaal: PLA
  • nozzle diameter: 0,4 mm
  • object width: 2,4 mm
  • wall thickness: 1,2 mm (i.e. the half of the object width, so ni infill is applied)
  • prints speed 20, 60, 120 en 180 mm/s


Two questions:

• We expect 6 beads with a width of slightly more than 0.4 mm. Printed are 7 beads. Why?

• The wires are printed from the inside (road 1) to the outside (road 7) printed. The beads do not have a constant width as the print speed varies. Road 1 (the inside) is very wide at high print speeds and narrower at lower printing speed. I think this is only possible if the central bead comes out extremely slow out of the nozzle and its neighbors on the other hand extremely fast. I'd rather have expected a constant bead width on all seven beads. Do you have an explanation for this?


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    Posted · Bead width varies with print speed

    Are you altering the temperature when you adjust the print speed.

    You can't expect to change the print speed without adjusting the temp and get the same width lines.

    I find it hard to understand your pictures and explanation but to answer your first question I think it's due to the initial layer height which is effecting how many beads you end up with. But I'm not sure.

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