Why no internal supports on first layer?

[StephenM 0]

Hi everyone. First post on UM forums.

UM3 with Cura 2.5.0, printing in PLA with PVA support.

The part is a planet carrier for a planetary gearbox.

The large internal cavity should be filled with support material.

Cura fails to create supports on layer 1, and therefore layer 2 doesn't stick, and the whole print failed.

Here's the part:

Layer 2 looks fine:

Layer 1 no internal supports:

Why?

Settings are all fairly typical: Supports and Brim with extruder 2, basically all default settings.

Weird.

Thanks everyone.

[gr5 2,230]

I was able to fix this but forget how. It was probably the "support x/y distance" parameter. Or maybe turn off brim.

[XYZDesignPro 70]

Make sure your Initial Layer Height is at least .5mm greater than your Layer Height.

I think Brim should be the build extruder 1, not the support extruder 2

If you have a machine available with Cura 2.4 on it try that. I've experienced anomalies with the support implementation in 2.5.

[StephenM 0]

Make sure your Initial Layer Height is at least .5mm greater than your Layer Height.

I think Brim should be the build extruder 1, not the support extruder 2

If you have a machine available with Cura 2.4 on it try that.  I've experienced anomalies with the support implementation in 2.5.

 

Thanks. Did you mean 0.05mm? 0.5mm would be huge!

And I see what you mean about the brim. That would probably help with adhesion, but kind of defeats the purpose of the soluble supports if I have to cut it all off manually.

Initial layer and brim settings are all default.

I'll try this on my computer tomorrow at work and see if it makes a difference.

[XYZDesignPro 70]

 

Make sure your Initial Layer Height is at least .5mm greater than your Layer Height.

I think Brim should be the build extruder 1, not the support extruder 2

If you have a machine available with Cura 2.4 on it try that.  I've experienced anomalies with the support implementation in 2.5.

 

Thanks. Did you mean 0.05mm? 0.5mm would be huge!

And I see what you mean about the brim. That would probably help with adhesion, but kind of defeats the purpose of the soluble supports if I have to cut it all off manually.

Initial layer and brim settings are all default.

I'll try this on my computer tomorrow at work and see if it makes a difference.

 

Yes of course .05mm. My bad. Sorry

By the look of it I'm not sure the part needs a brim for adhesion at all. Just use a single line count skirt on extruder 1 to make sure it is well primed.

Does the computer at work have Cura 2.4 or 2.5? If you don't have 2.4 available, can you make the STL file available? I'll give it a try myself. Looks like an interesting part.

[XYZDesignPro 70]

Stephen,

Did you ever solve this problem? If so, can you share the solution?

[3DukeEngineering 2]

This can happen when you have two sort of concentric patterns that touch the build plate, and support required inside of that. Uncheck "Brim replaces support" and away you go.

 

I realize this is an old thread but its still an issue, so maybe will help someone else in the future.