Hi,

I have been using this printer (Sigma 3D) for a year and I am very happy to announce that the designer has decided to make it open source. It is a solid design and relatively easy to build. Here's the link:

http://www.thingiverse.com/thing:817504

I have been writing a blog about its contruction process but I didn't update it recently due to a lack of time but this opportunity has given me an incentive to continue updating it:

http://www.3dprinterblog.org/