Optimizing (Calibrating) Print Heads - Stratasys J850 User Manual

Stratasys J850/J835 User Guide

Optimizing (Calibrating) Print Heads

The condition of the print heads directly affects the quality of 3D prints. To
maintain optimum printing, you should routinely test the print heads, and
calibrate them to the best working configuration possible by running the Head
Optimization wizard every 300 hours of printing.
You also need to calibrate the print heads in these cases:
• after changing the printing mode between High Mix / High Quality and one
• after replacing Vero with Digital ABS or Agilus30 model materials (and the
• after changing the type of support material (SUP705/706)
• after replacing the support material with cleaning fluid (and the reverse)
During this procedure, you place a scale on the build tray and connect it to the
printer. Printing material (resin) is jetted from each head and its weight is
automatically recorded and the wizard determines how to optimize the print
heads.
If, during the optimization process, the wizard determines that a print head is
faulty—or that it is negatively affecting layer uniformity with the current head
configuration—the wizard instructs you to replace it. If this happens, you can
continue the wizard to replace the print head, or abort the wizard, to replace the
head at another time.
Run the Head Optimization wizard every 300 hours of printing or whenever
the condition of print heads is negatively affecting the quality of 3D prints, or
if you suspect that there is a problem with one or more of the print heads.
Before running the wizard, empty the waste container. A full waste
container can cause the wizard to cancel or freeze.
Note: To accurately test and calibrate print heads, they must be clean. If
necessary, run the Cleaning wizard before beginning this procedure.
To test and calibrate the print heads:
1. Prepare—
DOC-18001 Rev. H
of the high-speed modes
reverse)
❒ disposable cleaning gloves (any clean, powder-free protective gloves)
❒ pink paper
❒ the Missing Nozzles ruler
❒ the scale supplied for use in the Head Optimization wizard
Important: Before beginning this procedure, ensure that the scale is
calibrated and at least partially charged.
4 Operating and Maintaining the Printer
4-64