Features/Dovetail Cut

Split STL files with dovetail joints

Interlocking teeth that slide together and lock. The seam helps parts self-align.

Dovetail cut with interlocking teeth in Multipart3D

When to use it

  • Parts must align the same way every time you assemble them
  • A flat glue joint feels too weak or too slippery to register
  • You want a mechanical lock before adhesives or magnets
  • Cosplay, props, or large prints that ship or travel in pieces

How it works

  1. Open Dovetail Cut and position the cut across the model.
  2. Adjust tooth size so the joint fits your printer’s tolerance.
  3. Preview the interlocking halves, then commit.
  4. Print a small tolerance test if needed, then export final parts.
Benchy split by a dovetail cut into two colored interlocking halves
After the cut, the halves interlock. Tooth size is set to match your printer.
Dovetail halves separated so the interlocking seam is visible
Pull the parts apart to inspect the joint before you zip them for slicing.

Dovetail-style seams turn a split into a joint. The teeth guide assembly and resist shear better than two smooth faces. In Multipart3D you generate that geometry in the browser instead of modeling the joint by hand in CAD.

This is especially useful when models are split for build volume: the joint carries alignment so you spend less time jigging parts during glue-up.

For invisible seams on organic shapes, you may still prefer a planar cut plus magnets. For structural or large parts, dovetails are often worth the visible tooth pattern.

Teeth beat a plug or a magnet when the joint has to resist shear and go back together the same way every time: a helmet, a prop, a panel you will take apart. They are the wrong joint when the seam crosses fine surface detail you care about, or when the shape is organic and a hidden magnet on a flat cut will look better. PrusaSlicer’s dovetail is one trapezoid and cannot carry connectors. Here the teeth are the seam, and tooth size is set for your printer’s clearance.

Tips

  • Leave clearance for your filament and printer. Tight teeth can weld shut.
  • Avoid placing teeth through fine surface detail you care about.
  • Use magnets or dowels in addition when you need clamping force.

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