Spring-Loaded Extruder CTC Replicator Dual fit

by LightbeamZ, published

Spring-Loaded Extruder CTC Replicator Dual fit by LightbeamZ Aug 18, 2015


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This is the makerbot spring-loaded extruder, but customised to fit the CTC Replicator Dual Printer. It uses the Gear of the original extruder.
I also made the bearing fixed with a screw because the original plastic piece looked way to weak.The cover fits a normal M3 screw head. You need a 8 mm M3 screw for the bearing, 16 mm M3 screw for the lever, 5 mm M3 countersunk screw (you can use the original and cut it) for the second screw to the motor. You also need 3 M3 washers. One is for the screw at the lever. Two for the bearing (you have to cut a bit of the material on the cover piece to fit perfect). The spring has to be 10 mm in diameter. I used 32mm x 10mm and cut it to 30mm x 10mm. Then it has pretty hard pressure.

When you install the extruder you should stick a bit of tape to the back of the heat sink which isolate the metal parts from each other, because they will make very annoying noises while printing. But make sure the tape is not between the alu block in the bottom and the heat sink, because than it won't cool it right.

Because it got requested, here are the STL files of both extruders.
Each extruder consists of the three parts:

  • main
  • lever
  • cover

you can download each part separate.

When you want to print ABS in a heated closed chamber you should print the extruder in ABS, because PLA will deform itself after a while. PLA worked for month for me when only printing PLA in open printer.

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I didn't have that problem, so I think my printer came with a 10mm bearing, but I don't want do disassemble my extruder right now.

The bearing from mine is too big http://i.imgur.com/1W7xWAe.jpg What is the OD of yours? Mine is 12mm. From what I've found there may be 2 different bearings that came with CTC printers. 10mm and 12mm.

Sorry I don't know which size the bearing is. It is the original one of the CTC machine. It has to be bigger then the one of the Makerbot because I had to make the hole for the bearing bigger to fit the CTC one. Its not a typical bearing because it uses a V-shape.

What size is the bearing on this thing? A 624zz bearing is too big.

Comments deleted.

I think it will work, because it is a remix of the original makerbot extruder and the axis of the bearing is the same. I only made a hole in that spot to put a screw instead of the plastic bearing axis. But you will need a flat bearing which pushes against the filament because on that gear the grove is in the gear and not the bearing.

And print the extruder in ABS when you want to print ABS with closed chamber. I printed the green ones in PLA and they worked fine for month until I tried to print ABS in heated closed chamber.

LightbeamZ, Will this work with MK8 Drive Gear http://reprap.me/mk8.html ? Also can you upload the STL files?
Thank you

It uses the gear and the bearing from the original extruder. I customized it to fit the original parts. You only need the screws, washers and the spring I mentioned in the info text.

From the instructions are you using the existing bareing from the extruder? If not what size bareing?

Yes, I used the original gear and the original v-shape bearing of the CTC extruder.