Stratasys J850 Manual page 113

Perform the Dynamic Nozzle Test if you suspect that poor quality in printed
models is caused by clogged or faulty nozzles in the print heads—even if this
is not indicated by the Pattern Test.
The Dynamic Nozzle Test prints eight (8) samples on the build tray, which
you can then visually inspect. Printing the samples takes about 20 minutes.
1. Make sure that the build tray is clear (empty).
2. From the Options menu, select
appropriate test for the current printing mode.
3. Check if there are gaps in the printed samples.
............
❒ In the left sample shown above, there are no gaps.
❒ In the right sample shown above, there are only two gaps, which is
acceptable.
Many gaps in the sample indicates that many nozzles in the print head are
not functioning. This might indicate the need to replace the defective
head. In this case, consult with your Stratasys service provider.
, and then select the