Checklist: model ready for SLS

Check minimum feature sizes and overall dimensions. The reference values apply to PA12 and do not establish part strength.

• Measure the thinnest vertical wall in the model.

  Orientation relative to the layers matters. Walls at or below the minimum may warp; horizontal walls have a separate value in the table.

  0.6 mm

• Check the smallest hole.

  Holes below the minimum may close during printing. Accuracy also depends on wall thickness; holes for a specified fit need separate assessment.

  1.0 mm

• Find the thinnest freestanding pin or wire.

  The recommended diameter applies to small freestanding features. Design ribs and snap-fits for the geometry, load and assembly requirements.

  0.8 mm

• Check the length, width and height of the part.

  The preliminary PA12 envelope in the calculator is 159.8 × 159.8 × 295.5 mm. We confirm orientation and print feasibility after reviewing the model; larger parts need assessment of splitting or another technology.

Unsintered powder supports the part during printing. Plan access to every internal space that needs cleaning.

• Mark every enclosed void in the model.

  An enclosed cavity can trap powder. If the interior must be clean, show access to it in the model or a cross-section.

• Add powder drain holes to every cavity.

  The recommended diameter is a starting point. Channel length, shape and tool access determine whether the interior can be cleaned.

  3.5 mm

• Check the number and position of powder drain holes.

  The manufacturer recommends at least two holes. Their position must provide access to the interior; the number alone does not guarantee powder removal.

  min. 2

Distinguish parts assembled after printing from mechanisms printed together. Test the required fit on a sample.

• List all pairs that are meant to fit into each other.

  Identify mating surfaces, required clearance and critical dimensions. Include a drawing for fits that the model alone does not specify.

• Choose clearance for parts assembled after printing.

  The stated value applies to contact areas below 20 mm². Use the separate table value for larger areas; other powders need assessment.

  0.2 mm

• Choose clearance for a print-in-place assembly.

  The stated value applies to contact areas below 20 mm². Larger areas need more clearance; also plan access for powder removal.

  0.3 mm

• Agree measurement conditions and a fit test.

  Agree temperature, humidity and measurement timing. Datasheet specimen conditions do not define a universal conditioning time for every part.

A legible marking helps identify the part. Check its size, position and access for cleaning.

• Check letter height in raised text.

  Smaller letters may be illegible. Also check stroke width and relief height; finishing can reduce fine detail.

  4.5 mm

• Check letter height in engraved text.

  The manufacturer gives a separate minimum for engraved letters. Check depth, groove width and orientation in the full table.

  3.0 mm

• Place the marking on a non-working surface.

  Avoid mating and friction surfaces. The marking should remain accessible for cleaning and reading in the intended working conditions.

Check the mesh, units and part name. A prepared model helps analysis; describe requirements in your enquiry.

• Check if the mesh is closed.

  An open mesh may prevent a reliable volume reading. Check the analysis report; model repair may need separate assessment.

• Export in millimetres.

  The wrong unit changes dimensions, volume and price. Compare the measured dimensions with the actual part.

• Use a clear part name for the file.

  A clear name and revision help associate quantities and requirements with the correct model when quoting or reordering.