Stratasys J850 Manual page 27

In High Mix / High Quality mode, J850/J835 printers use up to 14 cartridges
of Model material and two cartridges of Support material, each weighing 4
kilograms when full. In Super High Speed mode, you can use four cartridges
of Model material and four cartridges of Support material. A graphical
representation of the cartridges loaded and their current weight appears in
the printer interface
1. Open the doors of the material cabinet.
2. Load Model and Support cartridges into their respective compartments.
You should feel some resistance, as a needle pierces the cartridge.
3. Check the printer interface to make sure that the new cartridge is detected
and that its weight is displayed (see the figure on the previous page).
4. Close the material cabinet.
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(see the figure on the previous page).