Use the Unsafe segment removal page to specify that PartMaker removes small toolpath segments to prevent tool damage when using non-center cutting tools. When machining into small pockets, removing small segments stops the central, non-cutting underside of the tool from hitting non-machinable material. Unsafe segment removal filters out the machining of confined areas with small movement of the cutting tool.
Remove segments smaller than threshold — Select this option to remove segments that are smaller than the Threshold value.
Remove segments smaller than threshold option deselected:
Remove segments smaller than threshold selected:
Removes the small segments in areas 
and 
.
Threshold (tool diameter units) — Enter the size against which all segments are compared. The higher the threshold value, the more segments are removed.
— Segment length (Ls)
— Pocket length (Lp)
— Tool diameter (D)
— Non-cutting tool diameter (d)
This example uses a constant Z toolpath.
Threshold (tool diameter units) — 1.5:
Threshold (tool diameter units) — 0.7:
To calculate the minimum threshold value, divide the non-cutting diameter by the full tool diameter. Values smaller than this do not remove all unsafe segments.
Only remove segments from enclosed areas — Select this option to remove segments, in enclosed areas, that are smaller than the Threshold value.
Remove segments smaller than threshold and Only remove segments from enclosed areas deselected:
Remove segments smaller than threshold and Only remove segments from enclosed areas selected:
Removes the small segments in area , but doesn't remove the segments in area .