Calculate the E Axis value Cont....
Now we have changed the manual extrude value to 50mm, we need to mark
the filament with a marker pen, mark it say 100mm along from where the
filament enters the extruder, i.e. measure 100mm from the where the filament
enters the extruder. Now with the printer connected and up to temperature,
press the extrude button and let it complete the extrusion. Now measure the distance between the
where the filament enters the extruder and the mark you made and this distance should equal
50mm. If there is any variance from 50mm we need to do a calculation to ascertain the correct
value for “E”.
Take the Extruded amount requested (50mm) and multiply by the current “E” value (1487) then
divide this by the amount of filament actually fed though (i.e. the difference between your mark and
a movement of 50mm)
So for example “E” is set to “1487” the requested extrude was 50mm and the actual extrude was
48mm so we would calculate the following (50x1487)/48= our new “E” Value (1548.95)
The longer the amount you extrude and measure the more accurate you will be able to get this
value.
const bool ENDSTOPS_INVERTING=true;
This value defines the behavior of the endstops setting the value to “true” inverts the the logic of
the endstops
#define BAUDRATE 115200
This value determines the the baud rate (speed) of the serial port that printer is connected to. This
should be the same value as set in “port settings” in 10.1.2 & 10.1.3 and should be reflected in
within Pronterface (10.6.1 Step 3)
#define SDSupport
This value determines weather SD support is required comment it out by preceding it with a ”//”.
#define X_ENABLE_ON 0
#define Y_ENABLE_ON 0
#define Z_ENABLE_ON 0
#define E_ENABLE_ON 0
These values enable you to invert the stepper motor enable pins (shouldn’t need to touch these)
const bool Disable_X = false;
const bool Disable_Y = false;
const bool Disable_Z = true;
const bool Disable_E = false;
These values disable the respective axis when they are not being used, so the motor’s don’t “hold”
them whilst there idle, during printing.
const bool INVERT_X_DIR = true;
const bool INVERT_Y_DIR = true;
const bool INVERT_Z_DIR = true;
const bool INVERT_E_DIR = true;
These values will invert the direction of the respective axis if set to “true”
10.0 Computer Setup - Reprap Prusa Mendel Build Manual
©2012 NextDayReprap
Prusa Mendel Kit Build Manual V1.01 - 07/2012