1. Holes in the model
A model must be watertight to be sliced. Small holes can often be repaired automatically.
2. Flipped normals
When faces point inward, the model is interpreted incorrectly.
3. Walls that are too thin
Below roughly 1 mm a wall becomes fragile or disappears entirely.
4. Wrong scale
Always check that the file is in millimetres, or the part comes out the wrong size.
5. Large overhangs
Overhangs beyond roughly 45 degrees need supports, which cost time and finishing.
We review every file manually before sending a final quote.