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Hi guys!

If you're seeing this, that means you've done up a nice wiki page for your project
but forgotten to upload the files for it.

When you have a minute, could you upload the design files for this page?
RepRap is supposed to be open source, so if you were to upload files, that would
help everyone quite a bit, especially people who will want to make one of these.

Thank you,
--Sebastien Bailard

(This page is has an entry in the Category Please Upload Files.)

Crystal Clear action run.png

Release status: working

Hexagon extruder
CAD Models
External Link


The Hexagon hotend became available in 2014, can extrude PLA, ABS, Nylon and more. Can by used up to 300°C. Must be actively cooled with a fan that is always on (not connected to fan output, but directly to 5/12V).

The hotend has a standard Groove Mount that you can find on many extruders.

The Hexagon hotend is sold by ReprapDiscount as a kit. The kit includes a 12V/30w heater, prewired thermistor, an aluminium mounting plate, 40 & 30mm fans, 0.4mm nozzle as well as tools for mounting. The thermistor is a EPCOS B57560G104F NTC (type 1 in Marlin).

RepRapDiscount developed the Hexagon hotend.[1]

PID on Marlin

The default Ultimaker settings (in Configuration.h) in Marlin may work reasonably well:

   #define  DEFAULT_Kp 22.2
   #define  DEFAULT_Ki 1.08
   #define  DEFAULT_Kd 114

Alternate settings:

   #define  DEFAULT_Kp 14.23
   #define  DEFAULT_Ki 2.33
   #define  DEFAULT_Kd 21.68

You can also try to use the tuning features in Marlin.

Prints not starting

At high temperatures, the PID can easily overshoot using the default values and the fluctuations in measurement can be large. A sign of this is that your print never starts since the M109 command never returns, so your print is never started.

To remedy this, reduce these variables to make it easier to start the print:

   #define TEMP_RESIDENCY_TIME 5  // (seconds)
   #define TEMP_HYSTERESIS 5


Supplier Name Location link feedback
RepRapDiscount Hong Kong Hexagon hotend -
ROBO 3D California US Hexagon hotend -
Emotion Tech France Hexagon hotend 1.75 60 €