File Requirements
Supported formats, size limits, and design guidelines for successful prints.
Supported file formats
PrintPort3D accepts the most common 3D printing file formats. We recommend STL for most prints and 3MF for pre-configured files with embedded settings.
| Format | Extension | Best For | Notes |
|---|---|---|---|
| STL | .stl | Most prints | Most widely supported, recommended |
| 3MF | .3mf | Pre-configured prints | Can include print settings and scale data |
| OBJ | .obj | CAD exports | Converted to STL automatically |
| STEP | .step, .stp | Engineering parts | CAD format, converted automatically |
Not sure which format?
Size limits
Our printers have specific build volume and file size constraints.
Maximum build volume
About 10 × 10 × 10 inches. Models must fit within this space.
Minimum dimension
Features smaller than this may not print reliably.
File size limit
Most STL files are well under this. High-poly sculpts may need decimation.
Scale matters
Design guidelines
Following these guidelines ensures your prints come out correctly.
Watertight (manifold) mesh
Your model should be a solid, closed shape with no holes or gaps. Think of it like a balloon—it should be able to hold water.
Minimum wall thickness: 1.2mm
Walls thinner than 1.2mm may be too fragile or fail to print. For structural parts, use 2mm or more.
Flat base for bed adhesion
Models print best when they have a flat surface to sit on the print bed. Avoid point contacts or very small bases.
Avoid extreme overhangs
Overhangs beyond 45° may need supports. Our AI automatically detects and adds supports when needed, but extreme overhangs can affect quality.
Polygon count recommendations
| Triangle Count | Status | Notes |
|---|---|---|
| < 100,000 | Optimal | Fast processing, quick uploads |
| 100,000 - 500,000 | Acceptable | Slightly longer processing |
| > 500,000 | Consider decimation | May slow analysis, no visual benefit |
High-poly models
Common file issues
Our system automatically detects and often repairs these issues, but you'll get better results fixing them in your 3D software.
Non-manifold geometry
Holes, internal faces, or edges shared by more than 2 faces. Fix in Blender: Mesh → Clean Up → Make Manifold
Inverted normals
Some faces pointing inward instead of outward. We auto-fix this, but check if your model looks inside-out in the preview.
Zero-thickness walls
Single-sided surfaces can't be printed. Add thickness using Solidify modifier in Blender or Shell in Fusion 360.
Wrong scale
Model appears microscopic or building-sized. Re-export with units set to millimeters, or scale in your 3D software.