Maximum filling:

This filling mode allows to define the way the part are nested onto the support:

Automatic: the part are firstly positioned in the corners then on a concentric manner  from the outside to the inside. It is the mode that usually gives the smallest loss rate.

Up Left: the parts are firstly positioned on the upper left corner and then as shown in the bellow illustration:

Down Left, Up Right and Down Right work the same as above.

Enable straight front automatically:

While processing the nesting on a new support, if the loss rate reach the "maximal loss rate" value, TopSolid change the nesting mode on this support and uses the "straight front" as nesting mode.

The straight front allows to get a "one piece" offcut on one side of the support; this enable to reuse this offcut.

Straight front tuning:

Allows to define the side of the support from which the part will be nested.