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slic3r / Slic3r

Open Source toolpath generator for 3D printers
https://slic3r.org/
GNU Affero General Public License v3.0
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not obeying layers height #4799

Open prchal opened 5 years ago

prchal commented 5 years ago

Slicer doesn't obey layer settings when printer Z full step/mm is used.

Steps to reproduce the behavior:

  1. set printer's Z full step/mm to 25
  2. set extruder's limits min to 0.16 and max 0.2 (layer height)
  3. set printing layer height to 0.2/0.2, no adaptive slicing
  4. sliced some layers 0.16, some 0.24, for example layer 9.76 and next 10.0

Expected behavior Fixed layers should be fixed. Not exceeded max layer height.

Desktop (please complete the following information):

dwillmore commented 5 years ago

Reproduced with Slic3r-1.3.1-dev-85dd663-x86_64.AppImage on Fedora 29 x86_64.

lordofhyphens commented 5 years ago

So if I understand this situation, you have specified specific layer heights via the UI and would like Slic3r to do exactly that, even though you also told Slic3r to round all layers to the nearest full Z step?

lordofhyphens commented 5 years ago

For people wanting to experiment, the z_full_steps_per_mm behavior is in PrintObject::adjust_layer_height() (in PrintObject.cpp:547 or thereabouts). It is called by PrintObject::generate_object_layers()

The minimum and maximum layer heights are defined separately for all extruders, but generate_object_layers will calculate conservative boundaries, so pass those into adjust_layer_height

prchal commented 5 years ago

So if I understand this situation, you have specified specific layer heights via the UI and would like Slic3r to do exactly that, even though you also told Slic3r to round all layers to the nearest full Z step?

The specific layer heights which I set are rounded to Z full step. 0.2/(1/25) = 5 full steps. I wanted only this height 0.2, but slic produced 0.24, although it's rounded to full step, it's more then I wanted (for nozzle dia 0.3).