MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I bought this extruder in kit http://www.aliexpress.com/item/K800-Self-assembly-3D-Reprap-2014Newest-kossel-3D-printer-DIY-kit-The-pre-sale/1990522179.html where it was made from molded plastic. It broke after 20 hours of printing. Later I've printed it from ABS, but it became loose after approximately the same time. Design would be OK if bearing would be attached to metal, but to plastic, the shaft needs support from both sides....