Stratasys J850 Manual page 40

the job preparation application is also updated, and it displays the new
material(s).
15. Inspect the area around the purge unit and clean it, if necessary.
If you do not change the printing mode (High Quality/Speed) you can replace
the Model materials without flushing out the current materials. Use this
option when the color or mechanical properties of the printed model are
unimportant.
1. In the Material Replacement Options screen, click
2. In the Advanced Settings screen, select
.
.
and click