First Print of Flexion

Flexion Retrofit Kit Review

My Monoprice Duplicator I3 V2 3D printer has been under extruding and I needed a way to print flexible filaments. I researched many solutions like the Flexion Single Extruder, Bondtech QR Universal Extruder and the E3D Extruder Upgrades.  I read articles and watched YouTube videos reviewing each. In this article I will be reviewing the Flexion Single Extruder and providing my thoughts and experience with the flexion.

My Choice

I decided to go with the Flexion based on price and ease of installation.  Next I looked into where to make my purchase and decided to purchase it directly from the manufacturer DIABASE for $149 plus free shipping.  While others such as the Titan E3D where cheaper they required more modification of my printer.  The only other Extruder Upgrade Kit that came close was the Bondtech, because it like the Flexion came ready to install on the Monoprice Duplicator I3 V2 3D printer.  What impressed  me most about the Flexion was its ability to print flexible filaments with ease and the excellent reviews given by other reviewers.

Flexion Function

So, what did DIABASE do with Flexion that makes it so special? While it does have a radicle look, there are really two main things achieved by this extruder assembly.  First it maintains control of the filament throughout its journey through the extruder by use of dual PTFE tubes. Second and most importantly is its use of a cam dial and cam follower screw which replaces the old spring loaded tensioner arm.  The cam dial is adjusted from 1 – 4 based on the type of material being extruded. Also, included was a roller brush for continually keeping the driver roller clean.

Blown Up Image of Flexion

Installation and Use


The Flexion came in a small black box held securely in place by a shape fitting foam container. The Flexion website contained very easy to follow directions for installation.  I didn’t know about the direction on the website at first though.  The box contained no instructions only a sticker explaining what number to set the cam dial on based on the type of filament. After trying to follow a YouTube video to explain installation and I turned to the manufacturer support website.  I was then able to quickly install the extruder upgrade.  Installation took about thirty minutes with the proper instructions.  Be warned though the heater and thermal sensor cables are extremely fragile and should be moved only with extreme care.

First Layer Print


  1. When properly leveled, prints perfect first layers
  2. Easy to install
  3. Flexibles’ print with ease
  4. Filaments don’t get jammed
  5. The Duplicator I3 is faster and prints at higher resolutions
  6. Comes with 3 nozzles – 0.3, 0.4, 0.5 mm
  7. A roller brush for continually keeping the driver roller clean


  1. No instructions come with the upgrade
  2. The hot end is not all metal (Can be added with the “Flexion HT
    High-temp Flexion Extruder kit“)
  3. You have use the software to load and unload the extruder
  4. The Flexion is not cheap

Final Thoughts

So, would I recommend this upgrade? I love this hot end! This printer hasn’t worked right for months and now  it’s working great!  Flexion made my printer great again.  Ok, maybe I went a little too far on the last, but all jokes aside the Flexion extruder for the Wanhao Duplicator I3 is an excellent upgrade for those that can afford it.  It will give you the ability to print flexible filaments and improve the resolution and speed of your PLA and ABS prints.  I have not tried nylon or PETG as of yet but I am told that it does well with both.

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