Hey.
it would be great having an extra offset to start grooving from a defined starting point and not necessarily from the edge. in other words having anoter offset from the edge it self.
for example in length 1: 100,200,5,9,300 would groove:
100 from left bottom corner
200 distance from bottom edge
5 width
9 depth
300 length
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Another goal we can achieve by this is being able to cut shapes inside parts with CNC, for example by specifying 4 grooving lines away of the part's edges and that are connected at their ends we can produce a part with a square pocket cutted inside it.

Best Regards
Aslan