OpenScad cube with Text on-top is sliced badly....

[MarioLange1983 0]

Hi!

 

I have created a test cube with a letter on top in OpenScad. Normally the letter should start exactly after the last top layer of the cube at 5mm. But the letter starts as outlined letter around 4 layers too early (inside the top layers) and creates a nasty surface. 

 

 

OpenScad Example #1

cube([25,25,5]);
color("red")translate([4,2,5])linear_extrude(height = 2)
        text("A", font="Arial", size=20);

 

 

 

 

I have also tried to lift the letter 0.2mm (one layer higher), but this results in a bug?! 

 

-> layer18 (next layer after last top layer of the cube, letter is full, BUT nothing happens on this layer)

 

-> layer19 (now the letter starts)

 

 

OpenScad Example #2

cube([25,25,5]);
color("red")translate([4,2,5.2])linear_extrude(height = 2)
        text("A", font="Arial", size=20);

 

 

So iam not sure if this is a OpenScad problem, or a Cura Problem. Any suggestions here?

Edited March 7, 2023 by MarioLange1983

[Cuq 205]

Not a Bug just a normal behaviour for Cura as well for OpenScad.  If you want to get a complete Cube and a complete text your must generate 2 models and merge them into Cura . 

[GregValiant 1,330]

@MarioLange1983 if you scale your model up in the X and Y to about 150 x 150 I think you will get a better idea of what is going on.  Because it's a single model the infill from the lower cube is going up into the "A".  That results in a gap in the skin so the infill can keep going.

You can try setting the "Skin Expand Distance" to a higher number so it closes the gap where the infill sneaks through.

[MarioLange1983 0]

55 minutes ago, GregValiant said:

@MarioLange1983 if you scale your model up in the X and Y to about 150 x 150 I think you will get a better idea of what is going on.  Because it's a single model the infill from the lower cube is going up into the "A".  That results in a gap in the skin so the infill can keep going.

You can try setting the "Skin Expand Distance" to a higher number so it closes the gap where the infill sneaks through.

 

This answer makes things clear. I did not thought about the fact, that the infill also goes into the "A". I will test the "Skin Expand Distance" settings, for now the answer from @Cuq was working for me like i think it should!

[MarioLange1983 0]

2 hours ago, Cuq said:

Not a Bug just a normal behaviour for Cura as well for OpenScad.  If you want to get a complete Cube and a complete text your must generate 2 models and merge them into Cura . 

Thank you for this hint! I have created 2 models, put them together and now it prints like it should.