Link chain sprocket generator for OpenSCAD

This is my take on link chain sprockets. I think link chains as mechanical parts are a really intersting option for things like height adjustable desks etc. since the chains are really cheap and highly available in home improvement stores. They also can take high loads, however they are absolutely inappropriate for high speed or high precision jobs. They tend to have a decent amount of backlash too. Also they are quite noisy and non-linear (when you pull the chain with constant speed, the sprock