Need advice about 2D drawing

What I want to do is produce thicker sketch lines so when I export as SVG file the sketch has a wide line. Simple rectangle with rounded corners design.

Background.
I need to produce some svg drawings of simple rectangles with rounded corners to add to the surface of objects in prusaslicer to embed colour lined rectangles on surface of some objects. I’ve got the pruserslicer and printing part worked out and it does that beautifully.

My issue is in actually drawing the rectangles with thicker lines at high quality. My sole problem is the lines are too thin.

I’d like to export thick lines if I can. Simply offsetting lines and extruding the gap doesn’t work as the svg file exports only the lines and leaves the extrusion behind.

Apart from drawing multiple offsets really close together is there a simple way to thicken the line or fill in the offset gap at a 2d level?

Speaking of 2d sketching, I tried to get into 2d drawing part of shapr3d but I can’t find any understandable explanations of how to do and use 2d drawings and I am thinking that my interpretation of 2d and shapr3d idea of 2d drawings might be different.

Any advice on this?

John Martin

https://support.shapr3d.com/hc/en-us/requests/new

If you are creating simple boxes doing it in Shapr3d might be bit overkill.

You could open your svg in an art program like Illustrator or Inkscape (free) and add stroke thickness if the 2d drawing is just for visual purposes.

When you add your stroke you will have option of the thickness depth, if you want the stroke to be in the middle, inner or outer.