Normally, when using the Substract Solid tool, you select one solid which part you want to remove from the solid you click there after. But with this imported dxf file, which is just text created in Illustrator and exported as dxf, it doesn't work. I used Extend solid to create a solid that goes trough a cylinder, but when I subtract this solid from the cylinder, it brings up an error:

'Failure in face-face intersection merging algorithm' and then referring to the main cylinder.

I have "ungrouped" the text, which was imported as "grouped".

When I create an ordinary block solid, it works as expected.

Anyone know why this happens and how to solve it? I have the VC file attached.

Nop, Correction, there are a few weird surface on the model, my experience with illustrator is that tend to duplicate your curves, so, you have two overlap splines on all the text curves, beside that, curve's geometry from illustrator it is always painful for me, need a lot of work to clean or reconstruct the geometry.

With this curves, the resulted subtraction produce weird surfaces on the solid

[ATTACH]4640[/ATTACH]

[ATTACH]4641[/ATTACH]



Here you have the file after cleaning the curves geometry

[ATTACH]4642[/ATTACH]

Make sure that the illustrator file has only outlines. Fills will double up each line.