25D is where you cut out 2D shapes in one or multiple passes to a set depth It's basically a way to simulate a 3d look without all of the complex calculations that go along with a true 3d toolpath A good example is Vcarving 3D is where the shape or feature you Ultimate Guide Gorilla Glass vs Tempered Glass Screen Protector vs Dragontrail Glass What is D tempered glass? Fekete's experience seems to suggest that 25D (more specifically 25D/3D MoM with surface mesh) is better Since MoM can go to a smaller cell size with the same computer resource, Dr Rautio's comment also hints that 25D is better Authors of HFSS and EM3DS obviously have a different viewpoint
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