Certification Exam Practice Test Questions

Additive Manufacturing Technician Certification Exam Practice Test Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which of the following is the primary characteristic of additive

manufacturing?

a) Material removal

b) Layer-by-layer material addition

c) Metal forging

d) Material compression

Rationale: Additive manufacturing builds objects layer by layer, unlike

subtractive methods that remove material.

• What does the acronym STL stand for in 3D printing?

a) Standard Template Language

b) Standard Tessellation Language 1 / 4

c) Stereolithography Tool Language

d) Standard Transmission Layout

Rationale: STL stands for Standard Tessellation Language, which defines

the surface geometry of a 3D object.

• Which additive manufacturing process uses a laser to sinter powdered

material?

a) FDM

b) SLA

c) SLS

d) DLP

Rationale: Selective Laser Sintering (SLS) uses a laser to fuse powdered

materials together layer by layer.

• Which material is most commonly used in FDM printing?

a) Resin

b) Metal powder

c) Thermoplastic filament

d) Epoxy

Rationale: FDM uses thermoplastic filaments such as PLA or ABS that are

heated and extruded.

• / 4

• What is the main function of a slicer software?

a) Create 3D models

b) Convert 3D models into printable layers

c) Polish printed parts

d) Analyze mechanical properties

Rationale: Slicer software converts a 3D model into G-code instructions for

printing.

• In SLA printing, what type of energy source is used to cure resin?

a) Heat

b) Ultraviolet light

c) Microwave radiation

d) Mechanical pressure

Rationale: SLA uses a UV laser to harden photosensitive resin layer by

layer.

• Which of the following best describes porosity in additive

manufacturing?

a) Excessive heat zones

b) Tiny voids or air pockets in a printed part

c) Over-extruded filament

d) Layer delamination 3 / 4

Rationale: Porosity refers to internal air pockets or voids that weaken

printed parts.

• What is the purpose of support structures in 3D printing?

a) Increase print speed

b) Prevent sagging or collapse during printing

c) Reduce filament usage

d) Improve surface shine

Rationale: Support structures hold up overhanging features to maintain

dimensional accuracy.

• What does FDM stand for?

a) Fused Deposition Modeling

b) Fabrication Density Method

c) Filament Deposition Machine

d) Fast Design Manufacture

Rationale: FDM stands for Fused Deposition Modeling, a popular

extrusion-based 3D printing method.

• Which metal additive manufacturing process uses an electron beam as

its energy source?

a) SLS

• / 4