3D Product Post-Processing & Quality 1 — Questions and Answers
Question 1: What is 'support removal' in 3D printing post-processing?
- Physically removing temporary support structures printed alongside the part, using tools or dissolution in solvent (Correct answer)
- Removing digital support geometry from a CAD model after export
- Cleaning excess sinter powder from SLS-printed parts
- Stripping the surface coating from a finished part
Correct answer: Physically removing temporary support structures printed alongside the part, using tools or dissolution in solvent
Support removal involves cutting, pulling, or dissolving (in the case of soluble supports) the temporary structures printed to hold up overhanging geometry during printing.
Question 2: What is 'tolerance' in the context of manufactured parts and assemblies?
- The allowable dimensional variation from a nominal dimension that still allows a part to function correctly (Correct answer)
- The material's resistance to deformation under load
- The minimum wall thickness for a part to be structurally sound
- The surface roughness acceptable for a mating face
Correct answer: The allowable dimensional variation from a nominal dimension that still allows a part to function correctly
Tolerances define the acceptable range of a dimension — for example, a shaft diameter of 10.00mm with a +/-0.05mm tolerance means any value between 9.95 and 10.05mm is acceptable.
Question 3: What quality control method is a 'Coordinate Measuring Machine' (CMM) inspection?
- A precision measurement system that uses a probe to map physical dimensions of a part against its CAD specification (Correct answer)
- A computer monitoring system for tracking production machine uptime
- A digital caliper used to measure injection-molded part dimensions manually
- A software tool for comparing two CAD files for dimensional differences
Correct answer: A precision measurement system that uses a probe to map physical dimensions of a part against its CAD specification
CMMs use touch probes or laser scanners to precisely measure physical parts in 3D space, comparing measured dimensions to CAD tolerances to verify conformance.
Question 4: What is 'first article inspection' (FAI) in manufacturing?
- A thorough dimensional and functional check of the first production parts from a new tool or process to verify conformance before full production (Correct answer)
- The inspection of the first prototype built during the design phase
- A regulatory approval process for medical device products
- A random sampling quality check taken from an ongoing production run
Correct answer: A thorough dimensional and functional check of the first production parts from a new tool or process to verify conformance before full production
FAI verifies that a new manufacturing process (like a new injection mold) produces parts that meet all dimensional, functional, and cosmetic requirements before committing to full volume production.
Question 5: What does 'fit, form, and function' mean in product quality assurance?
- Three fundamental product requirements: that it assembles correctly (fit), looks as designed (form), and performs its intended purpose (function) (Correct answer)
- The three stages of a product's development lifecycle
- A marketing framework for evaluating product appeal
- The three tolerance classes used in mechanical engineering standards
Correct answer: Three fundamental product requirements: that it assembles correctly (fit), looks as designed (form), and performs its intended purpose (function)
Fit, form, and function is a quality shorthand ensuring a part: mates properly with adjacent components (fit), has correct geometry and appearance (form), and performs its intended job (function).
Question 6: What is 'vapor smoothing' post-processing for FDM parts?
- A chemical finishing process that exposes printed parts to solvent vapor to reflow surface material and reduce roughness (Correct answer)
- A cleaning step that uses steam to remove support residue
- A UV curing process for resin-printed parts
- A coating applied via spray gun to seal porous prints
Correct answer: A chemical finishing process that exposes printed parts to solvent vapor to reflow surface material and reduce roughness
Vapor smoothing exposes thermoplastic parts to solvent vapor (acetone for ABS/ASA) which slightly melts and reflows the surface, dramatically reducing layer line visibility.
3D Product Post-Processing & Quality 1
What is 'support removal' in 3D printing post-processing?