Stratasys F123 Series Manual page 131

Head Replacement
5. Unlock the head release lever for the head that will be replaced.
Material
Tube
Head
Ribbon
Cable
Head
Release
Lever
6. Pull the head assembly out of its position within the gantry and remove it from the printer.
Figure 11: Head Connections
Figure 12: Remove Head
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Replacing a Head
Page 120