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Summary
Export multi-body nTop designs to 3MF, STEP, or STL for multi-material FDM printing, with a PLA nosecone + carbon fiber implant as a worked example.Package Details
Export multi-body nTop designs for multi-material FDM printing. The included nTop file of a PLA aero nosecone with a PLA-CF motor mount implant serves as a worked example throughout.
Step 1: Define and Separate Your Material Zones
Before exporting, make sure your design is explicitly split into distinct bodies within nTop. Each material or color zone must be its own independent CAD Body or Mesh. Note: Avoid overlapping geometry. Use Boolean Subtract or Boolean Intersect to ensure that where Material A ends, Material B begins with a clean interface.
Start with your multiple implicit bodies positioned and dimensioned as desired.
Note that the matrix body “Fus Segment w Wire Hole” is meshed with a cutout of the “CF Implant” through a Boolean Subtract to ensure a clean interface. Mesh each object and Merge Meshes to export to your slicer.
Merging within nTop protects the relative positions of bodies by preventing the slicer from snapping objects back to the print plate — this allows objects to remain suspended within your structure. You can then split them by part in the slicer to specify varying filament types.
Do not export the bodies as one single mesh. Your slicer will read it as one body and you will be unable to split the file by part.
Step 2: Choosing the Right Export Format
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3MF (Highly Recommended)
- Why: 3MF files natively support multi-body assemblies, color data, and relative spatial positioning.
- How: Use the Export Mesh block and select
.3mf. Most modern slicers (Bambu Studio, Cura) will instantly recognize it as a multi-material object.
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STEP (For CAD/NURBS workflows)
- Why: Best if sending to a high-end toolpath generator or if you need precise analytical geometry.
- How: Convert your implicit bodies to CAD faces using CAD Body from Implicit and use the Export CAD block.
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Separate STLs (The Legacy Way)
- Why: Use this only if your slicer doesn’t support 3MF.
- How: Export each material zone as an individual
.stlfile.
Step 3: Slicer Import Best Practices
The most important part of multi-material printing is maintaining the shared coordinate system so parts align automatically. The easiest method is to export a 3MF of merged meshes. Example shown in Bambu Studio:
Import your part into your slicer.
Right-click your project in the “Objects” tab, go to “Split”, and select “To Parts”.
Select the filament type for each object by clicking the numbered/colored box next to the object name.
Alternative methods:
- If using 3MF: Drag and drop the file into your slicer. If prompted to “Load as a single part with multiple bodies,” click Yes. Right-click each sub-body to assign it to a specific extruder/filament.
- If using STLs: Select all exported STL files at once and drag them into the slicer together. Say Yes when asked to treat them as a single object with multiple parts — otherwise the slicer drops them all onto the build plate separately, destroying alignment.