FDM or resin? Start with the purpose
There is no single winning process for every part. Compare the details, material requirements and finishing work your application needs.
Understand the basic difference
FDM builds a part by depositing thermoplastic material in layers. SLA uses light to cure a liquid photopolymer resin. The difference in how the shape is formed affects preparation, material options and post-processing.
FDM often serves practical prototype workflows, while resin processes are frequently considered for fine-detail models and smooth appearance. The right answer depends on the actual part and material, not just the process name.
Compare the criteria that matter
Write a short list: visible detail, operating conditions, surface finish, dimensions, quantity and budget. Rank the items that are essential. A display model and a repeatedly loaded fixture can have very different priorities.
Ask what the proposed process includes after printing. Support removal and other finishing steps need to be considered when discussing the final appearance and delivery plan.
Let a sample resolve uncertainty
When a feature is difficult to judge on screen, a sample can be more useful than a broad process comparison. Select the smallest meaningful test and explain what you expect it to show.
Record your acceptance criteria before the sample is made. Agree how to evaluate fit, appearance or behaviour and use the result to guide the next design decision.
Bring this to your brief
Give the same brief to each process comparison. Compare the proposed finished result, not only the printer specification.
Prepare a project briefFurther reading
Formlabs: FDM and SLA comparedAsk about this guide
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