Replicator 2x Extruder Block Reinforcement
thingiverse
I managed to procure new extruder blocks from MakerBot under warranty after my original ones malfunctioned. The sole issue I encountered was that the hole for the filament guide tube would easily break. Fortunately, these reinforcements rectify this problem; simply print and install them on the drive block and you'll be good to go. To install them, you may need to heat the reinforcement first, but if it's too loose, a small amount of super glue will secure it in place.
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