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3DGence DOUBLE P255 | version 09.2018
2.2.
Calibration of offsets along X, Y and Z axes
Due to design characteristics of the dual hotend 3D printer, there are differences in the position of the hotends along X, Y and
Z axes.
X/Y/Z Offset is the name of the parameter describing the position difference of T1 extruder nozzle with respect to T0 extruder
nozzle along X/Y/Z axes. Fig. 61 shows the visualization of the offsets along X axis and Z axis. This difference can be compensated
by the printer settings, using the touch panel.
Fig. 61 Visualization of the nozzle position difference (offsets)
ATTENTION:
After each change of the hotend, the Z offset should be calibrated, and then the offsets along the X and Y axis
should be calibrated!
Calibration of Z axis offsets:
To calibrate the nozzle position difference along Z axis, use the
Z MEASURE
option available in
MENU → ADVANCED → MODULE
CALIB.
The printer makes the tensometric measurement of the distance of both hotends (T0 and T1) from the heatbed and
recalculates these distances to the position difference of the T1 extruder nozzle with respect to the T0 extruder nozzle.
The Z offset value can be also modified manually:
MENU → ADVANCED → MODULE CALIB. → Z
OFFSET
and use the +/- keys to
enter a value.
Calibration of XY offsets:
In order to verify the offset along the X, Y axes, the calibration model should be printed in the printer memory (procedure
described below). The model is prepared for PLA and BVOH materials. The printout takes about 10 minutes.
The model consists of two parts - part X (fig. 62) and part Y (fig. 63). Part X is used to set offset between hotends along the X
axis. Part Y is used to set offset between hotends along the Y axis. Each part consists of two material layers - the bottom layer
printed from support material (fig. 62, white) and the upper layer printed from model material (fig. 62, red).
Each part of the model is built of 11 lines. The middle line is point 0.00. The lines to the right from point 0.00 increase with the
plus sign every 0.05 mm in the range from 0.05 mm to 0.25 mm, and the lines to the left from 0.00 point decrease with the
minus sign every 0.05 mm in the range from -0.05 mm to - 0.25 mm (fig. 62, 63). Printed symbols: "+" on the right side and "-"
on the left side are helpful in determining the character with which the read value will have to be entered into the printer
(fig. 62, 63). With correctly calibrated offsets on the middle line (point 0.00), the model material coincides with the support
material both along the X axis and along the Y axis.
