
**Note: The files here are placeholders and may or may not work. For the latest files, please download from** [https://github.com/AxMod3DPrint/Drakon-Extruder](https://github.com/AxMod3DPrint/Drakon-Extruder)

**The Drakon Extruder** 

Reliability, Performance, Power

The Drakon has 3:1 gear reduction, fully FDM 3D Printed to keep costs down while performing as well as an extruder at 2-3 times the cost. The Gear ratio means that you’re able to use smaller, lighter motors while keeping the same pushing force as a standard non-geared extruder. For direct drive systems this means a lighter carriage, with less inertial mass, improving print quality. For Bowden systems running a standard sized motor means the Drakon becomes a power house of an extruder with all the power you’ll ever need to get your filament where it needs to go. In both Direct Drive and Bowden configurations you get the reliability and piece of mind to know that it’s not your extruder that’s going to fail.

Resolution

By increasing the gearing to 3:1, this triples the resolution, which can mitigate filament being extruded in pulses at slow speeds, which can result in a wavy surface finish, to give you a smooth surface finish. _Note: This will not help other mechanical issues such as Z Wobble or Z Banding._

Materials

The Drakon has a fully supported filament path, which means it can print anything from flexibles, Carbonfills, metalfills and the hardest of filaments and beyond.

Universally easy to use

The Drakon strips down quickly with no need to remove the motor from it’s mounting, loosen the 3 bolts and just remove it from it’s mount. Remove the 8mm nut and bushing and that’s it, highly easy to maintain, should you need to take it apart for any reason. The Tensioner window allows you to easily see and set the tension quickly and precisely with no fuss. Easily mounted on a Direct Drive system as well as a Bowden.  

<hr />
#####Assembly Video
[https://www.youtube.com/watch?v=jO8r4zXFYHI](https://www.youtube.com/watch?v=jO8r4zXFYHI)

##### Demo
[https://www.youtube.com/watch?v=O43gTT2txT4](https://www.youtube.com/watch?v=O43gTT2txT4)

Initially it only works with 1.75mm filament, but the 3mm will be available soon.

 <hr />

_This is licenced under the CERN OHL 1.2._

**Copyright © AxMod 3D Print 2021.**

This documentation describes Open Hardware and is licensed under the

**CERN OHL v. 1.2**

You may redistribute and modify this documentation under the terms of the
CERN OHL v.1.2. (http://ohwr.org/cernohl). This documentation is distributed
WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF
MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A
PARTICULAR PURPOSE. Please see the CERN OHL v.1.2 for applicable
conditions

Drakon Geared Extruder

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2329568.

###Meet the AX-03 Railgun 3D Printer. 

The ethos of this 3D Printer is to keep costs down, but be as rigid as possible with smooth movement, along with having a light weight direct drive extruder. This is why it uses 2040 Extrusion for the main frame. MGN Linear rails for the motion and the [Drakon Geared Extruder](http://www.thingiverse.com/thing:2172854) in direct drive configuration.

It is essentially a souped up Direct Drive Prusa i3 Style printer with none of the drawbacks of a standard i3. EG, only 1 Z motor is used with reciprocal belted motion to the 2nd lead screw to keep it all in sync.

**Files here are not always up to date, please use the Github at https://github.com/AxMod3DPrint/AX-03-Railgun for the latest file versions**

AX-03 Railgun 3D Printer

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1313587.

####Note - there will be no further updates to this page. Any further updates will be on the FB2020 Github page - https://github.com/AxMod3DPrint/FB2020
Originally based on the Fusebox, this printer now has become a design in it's own right. Most major parts have been redesigned from the ground up or have been overhauled in some way. 

#####Should you want to buy a full kit or buy the printed parts you can use the contact form on https://3dprint.axmod.co.uk to order.

<hr />

The Ethos of the Fusebox was to keep parts pricing low, which at the beginning of this project, was the same aim, however, it is now to improve the FB2020 to a point where it's pretty much it's fool proof and highly reliable. I want it to the point where anyone with a set of Allen keys can put it together. I'm happy with the frame rigidity, yes, it's not as rigid as it could be, but I still want to try to keep costs down where possible, by using printed plastic parts this helps a little. I've added a list of upcoming changes below.

All files should be orientated correctly for printing. Any file marked Culain is an original file from Culain's design and no physical changes apart from mirroring and orientating correctly have been made.

####NOTE: 
All bolt, rod and hot end holes on the STLS for the Carriage and Carriers have a 0.4mm tolerance. If you need less or more, grab the SCAD files. There is a setting in there to change it.

#####Belt Tensioning
The best way I have found is to loosen off the motors so they are on the end of the bolts in the Y direction. Pull the belts as taught as you can manually then tighten the motors back up to bring the belts to full tension. I'm working on a better tensioning system currently.

https://youtu.be/WNDfNemOfFM - Gayer-Anderson Cat in Whiter Generic PLA at 80mm/s at 0.1mm layer height.

https://youtu.be/yOhGpVYnDCI - Aztec Chief in ColorFabb NGEN at 80mm/s at 0.28 Layer Height

https://youtu.be/bmPf83OeyGA - Printing the Rigid coupler in ColorFabb NGEN at 80mm/s & 150mm/s Travel - retraction settings were being worked on, so the print is a little stringy..

https://youtu.be/XaOWR-UzrOI-  2nd Print - #3DBenchy Timelapse.


FB2020 CoreXY

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1926351.

I couldn't find a decent 2 into 1 Y Splitter that uses PC4-M6 Couplers, so I knocked this up. 

All you need is 3 PC4-M6 Pneumatic Couplers and 50mm of Bowden Tube to go from the coupler to the hot end. 

#####Note: This does not work well with PLA. PETG and Copolymers work without issue

***Update 1: reduced in size, tightened up holes for Pneumatic Couplers***
***Update 2: Further reduction in size reduced filament path holes, refinement of Tool change script***
***Update 3: Fixed error in model***
***Update 4: Updated GCode - G4 is the key to get it working reliably***

__Tool Change Script - Simplify3D__
~~~~
G91; Relative Coordinates
G1 Z+1 F420;  Lift Z for Tool Change
G1 X50 Y50 F4800; Move X Y for tool change
G90; Absolute Coordinates
T[old_tool]; Select Old Tool
G92 E0; Zero Extruder
G91; Relative Coordinates
G1 E-5 F10000; Fast Retract 5mm
G1 E2 F10000; Fast Reinsert 2mm
G1 E-47 F10000; Fast Retract 47mm
G4 P3000; Pause 3secs
G1 E-60 F1000; Fast long retract
G90; Absolute Coordinates
G92 E0; Zero Extruder
T[new_tool]; Select New tool
G92 E0; Zero Extruder
G91; Relative Coordinates
G1 E105 F10000; Fast insert 105mm
G1 E5 F300; 5mm/s Feed 5mm
G92 E0; Zero Extruder
G1 Z-1 F420; Return Z to resume printing
G90; Absolute Coordinates
~~~~
 Tool change Retraction in S3D is set to 6mm with a 2.5mm extra restart distance at 100mm/s

Dual Extrusion Y Splitter

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Drakon Geared Extruder

AX-03 Railgun 3D Printer

FB2020 CoreXY

Dual Extrusion Y Splitter