Spring-Loaded Extruder CTC Replicator Dual fit

thingiverse

This is the modified makerbot spring-loaded extruder, tailored specifically for the CTC Replicator Dual Printer and retaining the Gear of the original extruder. I also reinforced the bearing with a screw because the original plastic component seemed woefully inadequate. The cover accommodates a standard M3 screw head. To assemble this custom extruder, you will need an 8 mm M3 screw for the bearing, a 16 mm M3 screw for the lever, and a 5 mm M3 countersunk screw (you can reuse the original one by cutting it down) to secure the second screw to the motor. Additionally, three M3 washers are required: one for the screw at the lever, two for the bearing, which necessitates trimming a small amount from the cover piece to ensure a precise fit. The spring must be 10 mm in diameter; I opted for a 32mm x 10mm spring and trimmed it down to 30mm x 10mm, resulting in a remarkably tight pressure. When installing the extruder, apply a small strip of tape to the back of the heat sink to prevent metal parts from coming into contact with each other, thus minimizing annoying noises during printing. However, be sure not to place the tape between the alu block at the bottom and the heat sink, as this would compromise its ability to cool effectively. I have uploaded STL files for both extruders, comprising three parts: main, lever, and cover. You can download each component separately if desired. If you plan to print ABS in a heated closed chamber, it is advisable to use ABS filament for the extruder, as PLA may deform over time. In my experience, PLA has performed admirably for months when printing only PLA in an open environment.