DEFINE THE JOB
Test the function you need to learn.
A visual model, a fit-check enclosure and a working snap-fit answer different questions. Define the result needed from the prototype before comparing materials. Keep a simple, low-cost route where it answers the question; move to another system when geometry or service behavior requires it.
Typical project questions
- Fit and assembly checks for housings and brackets.
- Functional trials of clips, handles and moving interfaces.
- Detailed geometry or cosmetic approval before tooling.
Material systems worth evaluating.
These are selection directions. Compare current exact-grade data and confirm the installed process before approving a material.
| Material direction | Why review it | What still needs checking |
|---|---|---|
| PLA / PETG filament | Accessible geometry and fit iteration | Relevant load, heat exposure and layer direction |
| PA12 SLS | Complex geometry and support-free nesting | Surface, powder process and critical-feature accuracy |
| Engineering photopolymer | Fine details and controlled surfaces | Washed/cured state, exposure profile and long-term behavior |
A practical trial and approval sequence.
Define a measurable question
Choose a fit, force, movement or surface requirement that the prototype can answer.
Print the difficult features
Include interfaces, holes, thin walls and supported surfaces in the same trial.
Record what passed
Retain grade, lot, profile, orientation and the inspection result for the next iteration.
Details to resolve early
- A visually smooth surface does not establish structural performance.
- A fit measured before full conditioning or post-cure may change later.
- An easy-to-print grade can be useful even when it is not the final production material.
What to put in your inquiry.
Replace the bracketed fields with your project details.
Application: fit and function prototype for a reusable enclosure. Machine: [model/configuration]. Critical interfaces: [drawing/tolerances]. Load and temperature: [conditions]. Required finish: [description]. Trial quantity: [quantity]. Please propose exact grades and the documents/profile available.
Buyer questions
Should the prototype use the final production material?
Use the same material when the question depends on its behavior. Earlier geometry or assembly checks can use a different material if the limitations are recorded.
Can a resin prototype replace an injection-molded ABS test part?
Use it for the checks it can represent. ABS-like resin and molded ABS need separate material and process evidence.
Sources
- Formlabs — FDM, SLA and SLS comparison
Process and workflow differences; manufacturer-specific capabilities are not universal material approvals.
- Formlabs — material selection and mechanical properties
How stiffness, elongation and other properties relate to the part's job.
