@ Stefan Thx for the info!
Guy who ask me about SmoothTeddy said that is the more easy and adapted program for school's kids
(he tryed a lot other) the only lack is a traditional operational export format for a 3D Printing !
So my first post! :)

Personally this program don't works for me (surely java problem) so I can't test it!

Little precision
if the file .asg is present just rename it in .zip
Unzip and you will obtain a file format xlm