Hello, we are a team printing the Poppy robot (https://www.poppy-project.org/) with Wanhao Duplicator 4 using PLA.
We have a trouble when printing tall parts such as forearms:

  • in the first 5-6 centimetres, everything goes well.
  • Later, extruder starts to damage printed surface touching it
  • Then extruder move the detail and it falls down

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We tried to change parameters of the printer: feedrate, temperature of extruder and layer height, but it did not help.
On this screenshot there are parameters of one case:

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Did you have the same problem and if yes, how did you solve it? We assume that the problem is in fault that accumulates with time. Can you advise something?