If you don't have numpy, could you try installing that. I have it in my
Python library, but don't remember if it was already there when I started.

Could it be that there are more than one stl modules?

I took a look at the link you posted, and what I find most interesting about
it is the number of problems polyfix pointed out. It surprised me, because I
could slice the model (in Slic3r) just fine.

I haven't looked at AngelCAD at all. Do you have pre-built binaries
available anywhere?

Larry

cacb wrote

--
Sent from: http://forum.openscad.org/

On 2019-06-11 15:58, lar3ry wrote:

I will try again on a different computer and report back later.

Slicers are generally much more forgiving than cad programs, so many STL
files with issues can be printed without problems. Also important is the
fact that reading an STL file into a CAD program is a matter of
interpretation, so different software will report different issues.

Yes, you can get it at https://github.com/arnholm/angelcad/releases
(Windows/Ubuntu)

Carsten Arnholm

On 11.06.2019 17:31, arnholm@arnholm.org wrote:

I had another try, this time on a Kubuntu 18.04 computer with Python3.7

First I got the same error as before and installed (using pip3) the
'stl' package, same problem. Then I tried to install a 'mesh' package,
still no success. Next I tried your suggestion numpy, but this was no
success either. After searching with DuckDuckGo for "python package stl
mesh", I noticed there is something called 'numpy-stl'. So I did

pip3 install numpy-stl

Then it worked fine, I was able to run your .scad code successfully. So
I think you might want to add the requirement to install the python
package numpy-stl in your github README.md

Carsten Arnholm