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Ultimaker / Cura

3D printer / slicing GUI built on top of the Uranium framework
GNU Lesser General Public License v3.0
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Tree support generating unsupported material #7249

Closed Omee84 closed 4 years ago

Omee84 commented 4 years ago

Tree support generate supports that isnt attached to build plate- it appears first on layer 14. See attached screenshot and project.

Application version Cura 4.5

Platform Windows

Printer Anycubic i3 Mega

Reproduction steps

  1. See attached project file- preview the layers generated.

Screenshot(s) Capture

Actual results Support work first appears on layer 14 in the middle of the area between the mech's feet.

Expected results Supported area should start on layer 1.

Project file AI3M_Legs.zip

Ghostkeeper commented 4 years ago

You're reporting a duplicate of https://github.com/Ultimaker/Cura/issues/4342.

This issue is inherent in the way that tree support works: Tree support creates circles ("branches") starting from the overhang that gradually move closer together. If multiple branches, approaching from different sides, come together at the same height, then there was a gap in the middle that gets eradicated by the approach of different branches from different directions. What you're seeing here is one of those gaps that just doesn't go all the way down to the build plate.

In most cases this prints fine because the gaps between the branches are short-lived. It'll repair it in the end. In your case, maybe not.

You can solve this by adding some infill density, particularly with Gradual Support Infill Density. That will make your support connect better to itself.

Your project file doesn't reproduce the problem for me by the way, but I know what you're talking about.