I bought the MK8 extruder in the link, beacause it is hot sell:
http://www.ebay.com/itm/Geeetech-MK8-extruder-Upgrade-Print-Head-for-Makerbot-Reprap-3D-printer-Nema17-/191305623744?rd=1
Yesterday I have received it, and haven’t tested it in time. The delivered time is fast. I am looking for the electronic kits for it. Having some suggestion? Thanks.