After using slic3r regularly for 1.5 years, I just now see that Alessandro actually gives his donors shout out on his donations page! http://slic3r.org/donations. I didn’t give much back then, but I may be the 5th donor. Pretty cool. It’s a wonderfully innovative product contrasted against our prior G-CODE generators. I am very grateful to him for developing this and supporting open source. Here’s a lovely pic showing a simple, poor quality gear I printed our old tool chains back in 2010, contrasted against a high quality, feature rich end effector for cOssel, with almost no hardware changes!
Slic3r played a critical role in making it thus far!