Baby Bullet Extruder

This is the new default extruder as of Oct 2021. (It is named after Caltrain.)

Specs

• Orbiter Extruder
• Aluminum Metal Tool Plate
• ?? [grams] without wiring harness
• accepts V6 and Phaetus Firefly Groovemount-based tools

Software Configuration

Here are the general operating conditions:

• 681 [steps/mm] (aka: "Esteps")
• 450-500 [mA] Peak Current
• 0.03 - 0.05 [sec] Pressure Advance
• 0 [mm] nominal X offset from carriage
• 32.75 [mm] nominal Y offset from carriage
• -1.23 [mm] nominal Z offset from carriage

Duet Configuration

Note that the items shown in < > signs are placeholders and should be replaced with the values you actually have. (Remove the < > signs too!)

Finally, note that the order of these commands inthe config matter. You cannot refer to sensors or heaters in later lines of the config if they have not been created in previous lines of the config

Define Extruder Steps/mm and Accel/Velocity Characteristics

Set the Extruder steps/mm ("Esteps") with:

M92 E681

Warning: if you have multiple extruders, you need to define them all at once like this:

M92 E681:830

In the above example, Extruder 0 has 681 steps/mm while Extruder 1 has 830 steps/mm. If your extruder steps/mm are all the same, you can just use one value, and it will apply it to all extruders.

Set the Tool's max speed, accel, and jerk (instantaneous change in velocity) with:

M201 E3600                ; Orbiter 0 Max Speed (mm/min)
M203 E600                 ; Orbiter 0 Max Accel (mm/s^2)
M566 E300                 ; Orbiter 0 Max Jerk (mm/min)

Warning: like before, if you have multiple extruders with different settings, you need to call them out individually with values separated by colons.

Define a Extruder Axis

The Duet ecosystem assumes that tools are connected to single extruder axis. Extruder axes are numbered starting from 0. Define an axis with:

M584 E1.0                 ; Orbiter 0 on 3HC Board 1

The first number is the Canbus board that the motor lives on. The second number is the motor index. If you have multiple extruders, you must call them all out at once separated by colons like this:

M584 E1.0:1.1

Define a Motor Drive

M569 P<motor_drive_index> S<1 or 0> D2

Motor direction can be set to S0 forwards (default) or S1 backwards.

Assign peak motor current with:

M906 E450                 ; 500mA peak

Warning: like before, if you have multiple extruders with different settings, you need to set them all indidividually separated by colons.

Define a Temperature Sensor

The Duet ecosystem assumes that each extruder has a single temperature sensor. Define this extruder's temperature sensor index.

M308 S<sensor_index> P"1.temp0" Y"thermistor" T100000  B4725 C7.060000e-8 A"<sensor_name>"

Note that the Y"thermistor" can be other types of sensors, which may have different B and C settings--or none at all! The above settings apply to a generic E3D thermistor, usually the default in a hotend setup. There is a strict syntax of name choices that can be found in the M308 documentation.

Define a Heater

The Duet ecosystem assumes that each extruder has a single heater cartridge. Define this extruder's heater index.

M950 H<heater_index> C"1.out0" T<corresponding_temperature_sensor_index>

The C"1.out0" string encodes the Canbus board address followed by the output name. The example above creates a heater and assigns it to expansion board 1's output 0.

Define a Tool

Tools are numbered starting from 0. Define the tool index, tool name, and assign a corresponding motor drive, heater, and fan:

M563 P<tool_index> S"My Chocolate Extruder" D<motor_drive_index> H<heater_index> F<fan_index>

Nominal Offset

Define the tool's XYZ offset from the ZProbe's trigger location. These can be set to the nominal value and adjusted later when you align tools.

G10 P<tool_index> X0 Y32.75 Z-1.23

Pressure Advance

Optional: define this extruder's pressure advance value. This can be omitted (implying a value of 0), but a value of 0.1 seems to be a good starting point for this particular extruder.

M572 D<motor_drive_index> S0.03

Klipper

TODO!