FedEx just delivered the Replicator 2 spring-loaded drive block replacement kit that I ordered from Makerbot earlier this week. It’s a free part, you just have to pay tax and any shipping/handling fees. Dylan Ryder and I just installed the new drive block and it works amazingly! It’s seriously like having a brand new and improved machine. If you haven’t already ordered the part, do it now!
The good people at Makerbot’s customer service also sent me this video about how to clear a thermal barrier tube block in the machine’s extruder with this video tutorial: