After two failed attempts in high school I finally worked up the skills in cad to model the type ii curta calculator. I modeled this type ii curta calculator in about a week in my free time. I hope to 3D print it at a 3 : 1 when I'm home from school this summer. I was able to model it using old engineering drawings I was able to downloads from http://www.museummura.li/content.aspx?nid=5051&groupnr=5051. There were a few drawings missing but I was able to get them in with context clues from other parts.