*Flexion Extruder Kit - Dual i3 (right side only) (5121SKU002)


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Developed by the inventor of Ninjaflex

Flexible filament extruder retrofit kit for right side of dual-extruder printers. Print with flexible materials, higher resolution, and fewer failures. Your stock Mk10 left-side extruder fits in the other side. Also prints ABS and PLA better than your stock extruder.

*Does not include stepper motor

*Not compatible with stock QiDi or Makerbot extruders – for dual extrusion on these printers, you will need the complete dual kit.


Flexible filament extruder retrofit kit for dual-extruder direct-drive machines, such as Flashforge Creator, Monoprice Dual, or Powerspec Ultra. The Flexion extruder will allow full-speed printing of ultra-flexible filaments. The precision machined components allow your printer to push on filament harder, achieve high pressure in the nozzle, and control feed rates very closely. The self-cleaning drive will keep your long prints from failing due to a clogged drive. Works will with Ninjaflex, Filaflex, flexible PLA, TPU, TPE, ultra-flexible filament down to 50 Shore A, and all the standard rigid filaments like ABS and PLA.

This kit requires you to disassemble your printer’s extruder and reinstall this upgrade.

The Flexion Extruder is designed to fit as many models as possible – please see installation instructions for more details.


Works With:

Flashforge Creator, Monoprice Dual, Wanhao 4S, Powerspec Ultra, and many others.  See the Flexion support page for information on retrofitting to your printer.


Package Contents:

  • Mounting block
  • Tensioning arm with idler and cleaning brush
  • Adjustment cam
  • Custom drive gear
  • Feed barrel
  • Heater block
  • Insulation for heater block
  • 3 nozzles – 0.3, 0.4, 0.5 mm orifice
  • Adapter shim to allow 6mm and 0.25″ heater cartridges
  • 3 PTFE feed tubes
  • Spare cleaning brush
  • All mounting hardware
  • 6mm and 7mm wrench for installing nozzles
  • “Flexion inside” quick-guide sticker

Note: does not include stepper motor or motor mounting screws

Buy a Flexion Extruder Kit from #Spool3D for your 3D printer in Canada without the surprise cost of the exchange rate!

Manufacturer Part Number: 5121SKU002


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