away on it now. I have a bunch more different pencils but that model is by far my favorite. Eight bucks and change might seem like a lot to spend on a pencil but hey if the thing lasts you 100 years I mean what computer software can compare? I like Staedtler Mars lead the best though. I have a lifetime supply of it now. Perhaps a few lifetimes even. Mostly I like Mars equipment the best and I even have some of their lead holders too but I got to admit my Koh-I-Noor pencil is the best by a long margin. Some stuff is just perfect, and it is. So far I haven't used the perfect computer software yet. Not even close. Now that I'm thinking about it I cannot hardly even remember a time in my life when I didn't own that pencil. Man I ought to get buried with it or something. If I ever lost it I'd have to buy another one! I have lost a lot of stuff but I've never lost that pencil, like ever! Whenever I need it I can always find it. Excuse me but this is freaking me out. That pencil and me it is like fate, or destiny or something. ave you actually sent this to a 3d printer yet? I've tried importing sketchup generated stls into 3d printing software and 123D Make and had issues with tiny discontinuities in the model. Maybe your ruby files alleviate this problem though.