• Screw drive nut: connects the print base unit to the screw drive, enabling the
print base support to travel along the Z-axis.
• Guide rails: these are attached to the rear of the Witbox and help ensure correct
travel along the Z-axis. They also provide the printer with extra stability while the
base support is moving along the Z-axis.
• Skids: these connect the guide rails to the print base unit and help ensure
smooth travel along the Z-axis.
• Print base support: supports the base onto which the polymer filament is
extruded.
Figure 5.6 Z unit
Figure 5.7 Constituent parts of the Z unit
Metal coupling
Z-axismotor
Screw drive
Guide rails
Screw drive nut
Print base
support
Skids
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