Guillotine vs. Free Nesting: Which Cutting Layout Wins?

"Guillotine" and "nesting" are the two families of cutting layout, and choosing the right one matters more than most people expect.

Guillotine cuts

Every cut runs edge-to-edge across the sheet (or across an existing offcut), splitting it into two rectangles. Repeat recursively until all parts are placed. This is how panel saws, table saws and most circular-saw workflows actually cut, which makes guillotine layouts directly executable by humans.

• Pros: cuttable on any saw without repositioning long parts; predictable; fast.
• Cons: cannot save space by interlocking L-shaped or stepped arrangements; typically 3–8% more waste than free nesting on complex part lists.

Free nesting (MaxRects / bin packing)

Parts go anywhere on the sheet as long as they fit, with no requirement that cuts run across the whole sheet. This is the domain of CNC routers and industrial beam saws, which can cut arbitrary paths.

• Pros: the best material utilization, especially with many small parts; supports mixed shapes (circles, triangles).
• Cons: useless without a CNC or a beam saw — a human with a circular saw cannot physically execute a free-nesting layout safely.

Which should you use?

Rule of thumb: cutting on a panel saw or by hand — use guillotine. Cutting on a CNC router — use nesting. Mixed jobs (main panels on the saw, small parts on the CNC) benefit from running both and comparing: the calculator in Material Optimiser Pro offers the standard guillotine engine for free and MaxRects nesting on Pro.

Both engines respect kerf, trim and grain direction, so the comparison is apples to apples.