Hexagon
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Release status: working
Introduction
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 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 hotend has the typical grove mount that you can find on many extruders. The thermistor is a EPCOS B57560G104F NTC (type 1 in Marlin).
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
