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c) Fine adjustment of the two extruders
This chapter is only relevant for owners of the RF2000 v2 with dual extruder.
In order to produce a perfect 2-coloured print, you may need to adjust the distances between the two extruders. This is also called the extruder
offset. If the offset setting does not match the mechanical situation, the layers printed by extruder 0 and extruder 1 will not match 100% either.
The firmware has 2 setting options for this. You can find the setting values in the menu item "
Configuration
" - "
General
".
"Extruder Offset X"
• This value indicates the distance between the two extruders when you look at the printer from the front.
• The default value for this is "
33.594
". This means
33.594 mm
.
"Extruder Offset Y"
• This value indicates the differences between extruder 1 (right) and extruder 0 (left) in the Y-direction backwards or forwards.
• The default value for this is "
0.000
". This means
0.000 mm
. If the first digit behind the decimal point would be a 1 (i.e.
0.100 mm
), this would
be
100 µm
.
Determining the correct correction value
Determine the offset using the bicoloured cube "
Dual_Cube.gcode
" from the SD card. This cube is printed several times. The first time, it is
printed using the default settings (extruder offset X and Y).
The first cube is used to determine the offset for X and Y, e.g. using a calliper, and added to or subtracted from the default value.
Then the cube is printed again.
Repeat this until the layers are all cleanly on top of each other.
The cube is made up of six layers. They are printed alternatingly by extruder 0 and 1. The 1st layer (all the way down, orange) is
printed by extruder 0, the 2nd one (black) by extruder 1, the 3rd one by extruder 0 again, etc. This assumes that you are using the
G-code file from the SD card. If you slice the cube yourself and swap the extruders, the 1st layer will be printed by extruder 1. There
-
fore, ensure that you slice the cube so that the bottom layer is printed by extruder 0.
Front view of the 1st printout (offset X)
View from the right (offset Y)
Offset in X-direction in this example: 0.5 mm or 500 µm Offset in Y-direction in this example: 0.3 mm or 300 µm
If the layers of extruder 1 (black) protrude to the left in the front view (left figure, offset X), as in this example, this is a negative value. The default
value (
33.594
) therefore must be corrected downwards by the offset (in our example 0.5 mm). The value to be set would be approx.
33.094
.
It is possible that you do not hit the last digit precisely. This can be neglected. If the black layer protrudes to the right, you need to adjust the
value upwards.
If the black layers of extruder 1 protrude to the front when viewed from the right (offset Y), the value is also negative. The default value (
0.000
)
would therefore have to be set to approx.
-0.300
.
0,5 mm
0,3 mm
