Common processes
- FDM (filament) printing for large, lower-cost parts; large-format printers can make pieces several feet tall in sections.
- Resin (SLA/DLP) printing for small, finely detailed parts and smooth surfaces.
- SLS and other powder processes for strong functional parts, usually through industrial service bureaus.
- Finishing: sanding, filler primer, paint, and clear coat so prints look like molded or machined parts.
Good uses at a show
- Scaled-up product models when the real product is too small, too big, or not finished.
- Custom brackets and holders that make products easy to handle and hard to walk away with.
- Dimensional logos and signs.
- Giveaway prototypes and architectural or site models.
Plan the timeline
Large prints can take days of machine time before finishing. For a big prop, allow two to three weeks including paint, and longer before peak shows.
What to ask a shop
- What build volume can you print in one piece?
- Which materials do you offer, such as PLA, PETG, ABS, ASA, nylon, or resin?
- Do you paint and finish, or print only?
- Can you work from my CAD file (STEP or STL) or a 3D scan?
Questions
What file does a 3D printing shop need?
An STL, OBJ, or 3MF mesh, or a STEP file from CAD. Many shops also offer modeling from sketches or 3D scanning.
Is 3D printing cheaper than CNC carving?
For complex shapes in small numbers, often yes. For large simple shapes, CNC-carved foam is usually faster and cheaper.