Models for 3D printing are sliced wrong, can't figure out optimal thickness I have a 3D printer with 0.3mm and 0.8mm nozzles, and I am trying to figure out the optimal line widths for extruding some line art.

Workflow


I create the vector graphics in Illustrator, expand strokes and group everything as a Compound Path: Slice-test.svg
In Blender I import the SVG, go to Properties panel > Curves, extrude to approx. 2mm height, then convert to mesh: Slice-test.stl
I take the exported STL and slice it with Slic3r, 0.3mm nozzle diameter: Slice-test.gcode


Results

The first layer comes out wrong:


What's going on here. Is there something wrong with the model? I'm trying to figure out the best thickness and angle sharpness so that I can produce a bunch of extruded line art for making molds. I'm trying to avoid interrupted perimeters and fingernail-looking things at corners:



Also my workflow seems kinda slow for such a basic task. As a noob to Blender and total noob to Python scripting where can I learn about automating the part with the SVG import > Constant thickness extrude > Mesh > STL, so I can focus on the line art?
I opened your Slice-test.stl file in cura, and this is what I get:



The first layer appears correct to me.

Since you did not provide the line art for your flowers, I cannot verify that with cura.