* Setting step for unit and feedrate for extruders
* Setting PID for any extruder
* Real-time filament diameter measurement and control
* COLOR MIXING EXTRUDE
* MKR4 suppport for 4 extruder but width only one driver
* Singlenozzle support
* NPr2 support, multiextruder by NicolaP http://www.3dmakerlab.it/extruder-npr2.html
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@@ -175,6 +176,13 @@ If have one hotend and more extruder define SINGLENOZZLE for unique temperature.
*\#define SINGLENOZZLE //This is used for singlenozzled multiple extrusion configuration
### COLOR MIXING EXTRUDER
Support is added for the [Repetier Host compatible](http://reprap.org/wiki/Repetier_Color_Mixing) GCode M163 Sn Pn which sets a single mix factor at a time. For example M163 S0 P0.5 and M163 S1 P0.5 would be used to set a mix of half color 1 plus half color 2.
A shorthand gcode M165 is proposed to set the mixing parameters globally using parameters ABCDHI as a shortcut over multiple M163. For example, M165 A0.5 B0.5 would be used to set a mix of half color 1 plus half color 2.
If MIXING_VIRTUAL_TOOLS is set to 2 or greater the Repetier Host compatible M164 Sn command is also made available to save the current mix factors as a virtual tool that can be recalled later. This option changes the behavior of the gcode_T() function so it restores a saved mixture rather than setting a new extruder.
Following Pia Taubert's proposal, the G1 command is extended to accept up to 6 mixing parameters (ABCDHI). For example G1 A0.25 B0.6 C0.15 X10.0 Y99.2 E12.34 F9000 will set a mixture for 3 channels starting with the current move. The mix parameters must add up to 1.0. If they don't they will be normalized – scaled up or down to add up to 1.0. The mix is persistent, so further moves will continue to use the same mix.
### MKR4 System
The system MKR4 allows two extruders for each driver on the motherboard. So with two drivers available you get to have 4 extruders. This is due to the relays controlled by the same motherboard with the pins. Look at the bottom of the file pins.h to set the right pin. This system allows the use of flux channeler to print in color. See http://www.immaginaecrea.it/index.php/blog-wordpress/post/150-flusso-canalizzatore-a-4-vie-la-stampa-3d-a-4-colori-e-gia-realta-per-lambiente-reprap-prima-parte
