I've not taken the time to learn heekscad. I use Sketchup. Import DXF
push/pull face, type in mm to extrude.
bam.
Course then you need the STL export plugin, and I can't remember if I had
to get a DXF import plugin or not, now that I think about it.
I've use openscad, but with similar can't read the DXF problems. Which is not
so much a problem in Inkscape's, Illustrator's or Coreldraw's (each of which I've used)
abiltiy to export, but more of a severe lacking on Heekscad and openscad to read
a modern DXF file.
I know both solidworks and inventor do it just fine. Not really a good choice for
the weekend cad monkey.
Maybe the Blender? Another program I consider to be high learning curve for
just wanting to do the one thing.
Anyone have any other suggestions?
I'd be glad to throw something in and extrude it for you if you'd like.
I know it's kind of a hassle for you though.
I'd also be glad to show you the howto in sketchup if you have a OSX or
Win machine of course.
-b