Ohio 3D Printing Technician Exam

Ohio 3D Printing Technician Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• Which 3D printing process uses a laser to sinter powdered material

layer by layer?

a) Fused Deposition Modeling (FDM)

b) Stereolithography (SLA)

c) Selective Laser Sintering (SLS)

d) Digital Light Processing (DLP)

SLS uses a laser to sinter powdered materials, such as nylon or metals, layer by layer to form a solid object.

• What material is most commonly used in Fused Deposition Modeling

(FDM)?

a) Resin

b) Thermoplastic filament (PLA, ABS)

c) Metal powder 1 / 4

d) Ceramics

FDM printers typically use thermoplastic filaments like PLA or ABS, which are melted and extruded layer by layer.

• Which 3D printing technology uses liquid photopolymer resin cured by

light?

a) Stereolithography (SLA)

b) Selective Laser Sintering (SLS)

c) FDM

d) Binder Jetting

SLA uses a UV laser or light source to cure liquid photopolymer resin into solid layers.

• What is the main limitation of FDM printing?

a) High cost

b) Lower surface finish and detail compared to SLA or SLS

c) Cannot print plastics

d) Requires post-curing

FDM is cost-effective but generally produces rougher surfaces and less detail than SLA or SLS.

• Which property is crucial for 3D printing metal parts?

a) Transparency

b) Flexibility

c) Melting point and powder flowability

d) Biodegradability 2 / 4

Metal 3D printing requires powders that melt predictably and flow smoothly for even layer deposition.

• In additive manufacturing, what is meant by “support structures”?

a) The printer frame

b) Extruder components

c) Temporary material to hold overhanging features

d) Printer software

Supports prevent sagging or collapse of overhangs during printing and are removed after the print.

• Which software is commonly used to prepare a 3D model for printing?

a) Excel

b) AutoCAD LT

c) Slicer software (e.g., Cura, PrusaSlicer)

d) Photoshop

Slicer software converts 3D models into machine-readable G-code with layer-by-layer instructions for the printer.

• Which factor most affects 3D print strength?

a) Printer color

b) Printing speed only

c) Layer adhesion and material choice

d) Number of users

Layer adhesion, infill density, and material properties directly impact the strength of the final part. 3 / 4

• What is the main advantage of SLA over FDM?

a) Lower cost

b) Faster printing

c) Higher detail and smoother surface finish

d) Uses thermoplastics

SLA produces smoother surfaces and finer details because it cures liquid resin with precise light.

• What is “warping” in 3D printing?

a) Printer calibration error

b) Software glitch

c) Distortion due to uneven cooling of material

d) Over-extrusion

Warping occurs when parts contract unevenly during cooling, especially with ABS and large flat surfaces.

• Which 3D printing process is most suitable for producing dental

aligners?

a) FDM

b) SLS

c) SLA

d) Binder Jetting

SLA offers high resolution and smooth surfaces, ideal for dental applications like aligners or molds.

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