3DGence DOUBLE P255 Manuel d'entretien - Page 9

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5. 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.

3DGence DOUBLE P255 - maintenance activities | version 07.2021