Common 2D Nesting Problems and Fixes

Parts Reported Oversize or Unplaced

After Auto-nest, a yellow banner lists pieces that did not fit even alone on an empty sheet at the current width × height (including kerf and allowed rotation). Common causes:

• Part genuinely larger than stock — a 52 in bracket on a 48 in-wide sheet cannot fit at any angle if its bounding box exceeds the sheet minus kerf.
• Wrong units — sheet in inches but DXF imported in mm (or vice versa) makes dimensions look tiny or huge. Confirm the unit dropdown matches your drawing.
• Kerf too large — extreme kerf values shrink the packable area; dial kerf to your actual process.
• Rotate unchecked — a 40×10 in part may fit on 48×96 with rotation enabled but fail at 0° only.
• Bounding-box rejection on a diagonal-only fit — a long narrow bar may fail the rectangle packer but fit at 45° with true-shape On and Balanced or Thorough effort.

Fixes: increase sheet size, split the part in CAD, reduce kerf to realistic values, enable Rotate, upload a proper closed DXF with True Shape On, or hand-place after a partial Auto-nest. If the part should fit but still flags unplaced, check the parts table size against your CAD bounding box.

Low Yield on Odd-Shaped Sheets or Remnants

Yield % is placed part area ÷ total sheet area on all sheets used. Low yield is normal when:

• The sheet aspect ratio does not match your parts (long skinny remnant + square parts).
• You are nesting one or two small parts on a full 4×8 — the tool uses a whole sheet tab even if most of it is empty.
• Concave profiles are packed as bounding boxes because True Shape is Off or no DXF was uploaded.
• Circles are packed in square footprints (see below).

Fixes: nest onto a smaller custom sheet size that matches your remnant, combine more parts into one job, upload DXF outlines with True Shape On, try Thorough effort for DXF jobs, or hand-drag parts into corners and pockets after Auto-nest. For mixed jobs where algorithm yield plateaus, see Auto-Nest vs Manual Nesting.

DXF Import Shows Convex-Hull Instead of True Outline

When you upload a DXF, the parts table shows either true outline or convex-hull boundary. A convex hull is the rubber-band shape around your geometry — concave pockets and re-entrant corners are filled in. Nesting on the hull:

• Reduces yield — the hull is larger than the real part; L-shapes become rectangles in the packer’s eyes.
• Hurts cut accuracy — exported DXF follows the hull, not your intended profile, unless you fix the source file.

The parser prefers a single closed outer loop. It falls back to a hull when the file has gaps, multiple disjoint outlines, open contours, or construction geometry that does not form one closed boundary.

Fixes in CAD before re-upload: join open endpoints, delete construction lines, export one part per file, ensure the cut contour is closed, simplify splines to polylines if needed, and verify scale (1:1 drawing units). Re-upload until the table reads true outline, then run Auto-nest with True Shape On.

Multi-Sheet Overflow

When total part area exceeds one sheet, the engine opens Sheet 2, Sheet 3, and so on until parts are placed or marked unplaced. Sheet tabs let you review each plate independently; PDF/DXF export applies to the current sheet tab for DXF.

If you expected everything on one sheet but got two:

• Run Auto-nest again at Balanced or Thorough — different orderings can save a sheet on tight jobs.
• Enable True Shape for concave DXF parts — interlocking can drop a sheet count.
• Check kerf — excessive gap pushes parts to the next sheet.
• Hand-drag the largest offcut-friendly arrangement on Sheet 1, then re-run or manually place Sheet 2 pieces.

Overflow is not a bug — it is the tool telling you the job needs more stock. Use sheets used + waste area + yield together when deciding whether to buy another full sheet or rearrange.

Circle vs Rectangle Footprint Waste

Circles nest inside square footprints (diameter × diameter) in the rectangle packer — the corners of that square are empty air. That is correct for collision detection but lowers yield when a job is mostly rounds (flanges, washers, holes-on-plate patterns).

Mitigations: mix circles with rectangles so corners get filled; switch small rounds to DXF circles (true outline) in true-shape mode so adjacent parts can encroach into corner voids where clearance allows; hand-place rings in a hex-style pattern after Auto-nest; or accept lower yield when the layout is still cheaper than manual trial-and-error.

“Time Budget Hit — Reduced Angle Search” on Large Thorough Jobs

True-shape Auto-nest runs in the browser with a time budget per quality preset (Fast ~2.5s, Balanced ~5s, Thorough ~14s of search per packing pass — approximate). On large part counts or complex polygons, Thorough may exhaust its budget before trying every 15° angle on every part. The status message time budget hit — reduced angle search means the engine finished with a valid, kerf-safe layout but skipped some angle/position combinations.

What changes: you might miss a slightly tighter nest that only appears at an unusual rotation. What does not change: parts should not be falsely marked oversize because of timeout — degradation trims search effort, not fit testing on angles already tried.

What to do:

• Switch to Balanced for everyday DXF jobs — often the same sheet count in half the wait.
• Reduce part count per run (nest sub-assemblies separately).
• Simplify heavy DXF polylines (fewer vertices = faster search).
• After Auto-nest, hand-rotate critical pieces with the free-angle handle — manual 23° can beat a rushed 15° grid.
• Reserve Thorough for final layouts on moderate-size lists, not 200-part BOMs.

Still Stuck?

Re-read How to Nest Parts for 2D Sheet Cutting for kerf math and export choices. Compare auto vs hand placement in Auto-Nest vs Manual Nesting. For 1D bar issues (unfittable length, remnant order), use Cut List Troubleshooting instead — different tool, different failure modes.