Bresser T-Rex Instruction Manual page 47

Support Options: Click the Support Options button to display the Support
Options dialogue.
You can select Treelike or Linear supports. Treelike supports are built at angles,
while Linear supports are linear, vertical supports for the overhanging elements.
When you click the OK button, the software will generate the appropriate
support structures. If the model already has supports, the software will judge
whether the existing supports need to be deleted or not on the basis of the type
of existing support, and display the corresponding prompt to let you make the
choice
Auto Supports:
Add Supports:
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Click the Auto Supports button to allow the software to
judge where supports are needed and will generate
corresponding treelike or linear supports. If the model
already has supports, the software will delete them and new
supports will be generated.
Click the Add button to manually generate supports. Move
the cursor to the position where a support is needed, left
click to choose the starting point, then while holding down
the mouse button, drag the mouse to the termination point.
The supports preview will be displayed with the support
highlighted. If the support surface doesn't need support or
the support column angle is too large, the support will not be
generated.
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