Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Replicator 2X Extruder Upgrade for Flexible Filament

by mangojelly, published

Replicator 2X Extruder Upgrade for Flexible Filament by mangojelly Dec 13, 2017
0 Share
Download All Files

Thing Apps Enabled

Order This Printed View All Apps


Design Tools

Solidworks Inventor

Liked By

View All

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.

Print Thing Tag

Thing Statistics

280Views 55Downloads Found in 3D Printer Extruders


Made some minor changes to the awesome upgrade designed by rmcniff: https://www.thingiverse.com/thing:222667

Original remix by rmcniff improved printing with NinjaFlex and other flexible filaments, but I often would still have to continually clean the nozzle after every print and it would often jam during the print, forcing me to restart.

Fixed a few crucial dimensions to provide better extrusion and have had great results so far.

  1. Added an additional upper filament guide tube above the gear. Although the lower guide hole helped, I still had problems with the filament bunching up above the gear. This provides an even more directed path for the filament.
  2. Increased height of the base below the spring to increase the compression of the spring. I had an issue with the recommended McMaster spring not providing enough tension to pull the flexible filament through the extruder. This could also be solved with purchasing a more rigid spring, but was easily solved modifying the design.
  3. Decreased the depth of the channel to allow for the screw to fully tighten. For some reason the recessed channel in the lever arm for the shoulder bolt was too deep, which meant I couldn't fully tighten the screw down.
  4. Decreased the thickness of the extruder block. The lever arm was too thick and came into contact with the heat sink resulting in added friction, making it difficult for the spring to push the arm up.

The combination of the drive gear providing more force and an almost fully enclosed filament guide allows the printer to successfully extrude flexible material. These modifications have greatly improved both my print quality and success rate using flexible filament with the MakerBot Replicator 2X.

I have attached STL files, but can provide STEP files if someone wants.

Refer to the instructions from rmcniff for post processing and installation if needed. However, I did not have to do any post processing and was able to use my parts as is. https://www.thingiverse.com/thing:222667

Note: This is for the right extruder, you can simply mirror the STL files if needing an upgrade for the left extruder.

Happy printing!

Print Settings


Raise 3D N2


Doesn't Matter








Shells: 3

More from 3D Printer Extruders

view more

All Apps

Auto-magically prepare your 3D models for 3D printing. A cloud based 3D models Preparing and Healing solution for 3D Printing, MakePrintable provides features for model repairing, wall thickness...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

Print through a distributed network of 3D printing enthusiasts from across the US, at a fraction of the cost of the competitors. We want to change the world for the better through technology, an...

App Info Launch App

Quickly Scale, Mirror or Cut your 3D Models

App Info Launch App

Treatstock is an online platform that offers decentralized manufacturing services such as 3D printing and CNC machining for business-to-business and business-to-consumer sales all over the world. W...

App Info Launch App

3D print your favourite design with NinjaPrototype, a professional 3D manufacture with consistent quality and speed.

App Info Launch App