jim fired this volley in
:

The use of the term 2.5D in CamBam refers to the type of
tool path (all surface cutting motion is restricted to 2d).

2.5d as used in CamBam does not refer to the shape or
complexity of the 3d surface. All it means is that the
software only supports 2-axis surfacing moves. CamBam may
be able to handle 2.5D geometry better than 3d geometry, but
I doubt it is much better at it because it has no way of telling
if the geometry is 2.5d

Really? You're a regular CamBam user, then, and know all this?

In "waterline" cutting of 3D meshes, it does follow only 2D cutting
paths. It has other strategies that can follow surfaces in 3D, moving in
all three axes at once. I know this from doing it, not merely reading
about it.

Are you a regular user of it? C'mon! It's NOT professional CAM, but
it's a whole lot more capable than you give it credit for being.

LLoyd