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Operating & Maintaining the Connex500/350 3D Printer
Replacing
Print Heads
6–40
Missing row
Printed sample
Figure 6-54: Measuring a missing row in a printed sample
In the example above, the number of missing nozzles is one (1). More
than 12, or more than four consecutive clogged nozzles are an indication
that you may need to replace the print head.
Note: During this procedure, the roller does not smooth the surface of the
printed samples. Do not mistake the visible lines in the sample for missing
material.
To complete the calibration procedure, you need to weigh the printed
patches. An external head calibration utility uses these weights to adjust
the voltage applied to each print head.
The condition of the print heads directly affects the quality of printed
models. You may need to replace a print head if one or more of the
following symptoms occurs:
•
There are noticeable grooves in the surface of printed models.
•
Visual inspection of the head reveals that its surface is damaged—
peeling or bubbles in the nozzle area.
•
The pattern test or the weight test reveals that more than four
consecutive nozzles—or a total of more than 12 nozzles—are not
functioning.
•
The print‐head calibration utility indicates that a head cannot be
calibrated for acceptable printing—see "Calibrating (Optimizing) Print
Heads" on page 38.
•
The printer interface displays a warning or malfunction message
relating to a print head—
Head Heater temperature timeout
Head Heater thermistor open
Head Heater thermistor short
Replace print heads only after attempting all other means for improving print
quality (see "Improving Print Quality" on page 6-28) and after consulting
with an authorized customer-support engineer.
Ruler
DOC-13025 Rev. A
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