OpenAI - 3D Printing Lab Technician, Robotics
JUSTIN WANG
MECHANICAL ENGINEER
Portfolio Summary
My work sits at the intersection of mechanical engineering, fabrication, additive manufacturing, and hands-on product development. I enjoy moving quickly from idea to physical prototype, troubleshooting real-world hardware issues, and building systems that help engineering teams iterate faster.
Featured Projects
15-Printer Additive Manufacturing Workflow
Managed a mixed fleet of desktop and large-format FDM printers including Bambu, Creality, and Modix systems. Supported rapid prototype production, low-volume manufacturing, printer troubleshooting, material selection, slicing optimization, and workflow planning.
Highlights
Operated a 15-printer fleet across desktop and large-format systems
Maintained production workflows across day and night shifts
Supported approximately 70% printer utilization
Tuned print orientation, slicing settings, and material choice for speed, strength, and surface finish
Used Bambu Studio, OrcaSlicer, and Cura for print preparation
Worked with ASA-GF, PETG-GF, TPU, ABS, Nylon, and other engineering materials
Skills Demonstrated
Additive manufacturing, printer maintenance, workflow development, production coordination, troubleshooting, material selection
Full-Scale Automotive Prototype Parts
Produced full-scale automotive components for test fitting, customer review, and show vehicle preparation. Parts included bumpers, side skirts, fender flares, spoilers, and aerodynamic body components.
Highlights
Printed 6 kg bumper prototypes within 24 hours for vehicle fitment checks
Delivered full custom vehicle kits within roughly one month
Supported revision cycles before major events such as SEMA
Performed on-vehicle test fitting and fitment analysis
Tuned designs for shrinkage, assembly, and show-car finish quality
Skills Demonstrated
Large-format printing, prototype iteration, dimensional inspection, fitment validation, customer-facing engineering
3D Scanning, Reverse Engineering, and Mesh Editing
Used 3D scanning and CAD workflows to reverse engineer custom-fit components and support vehicle-based prototype development.
Highlights
Captured scan data for physical parts and vehicle surfaces
Processed meshes using Artec Studio, Geomagic, Blender, Fusion 360, and Onshape
Converted scan data into usable CAD references
Supported surfacing, fitment analysis, and dimensional correction
Used scan comparison to evaluate variation and improve design fit
Skills Demonstrated
3D scanning, reverse engineering, scan analysis, mesh editing, surfacing, CAD cleanup
Post-Processing and Show-Quality Finishing
Supported prototype finishing workflows depending on final use case, customer expectations, and part requirements.
Highlights
Determined when sanding, bonding, filler, primer, or paint preparation was necessary
Prepared printed parts for customer review, test fitting, and display
Balanced speed, finish quality, and structural requirements
Supported assembly and finishing for show-car quality applications
Skills Demonstrated
Post-processing, sanding, body filler, bonding, priming, finishing, assembly prep
E-Commerce Product Development
Built and managed an independent e-commerce business selling custom engineered products. Owned the process from design and sourcing through fulfillment and customer support.
Highlights
Designed products in CAD and prepared them for manufacturing
Coordinated MJF, SLA, and PolyJet vendors for outsourced production
Managed inventory, packaging, product listings, customer communication, and fulfillment
Performed quality inspection and dimensional checks before shipment
Skills Demonstrated
Product development, vendor coordination, quality control, fulfillment, customer support
EV Engineering and Validation Experience
Worked as a mechanical engineer supporting EV development, testing, validation, and troubleshooting.
Highlights
Supported drivetrain and mechanical system validation
Worked with engineers and technicians to troubleshoot mechanical and instrumentation issues
Supported fixture setup, instrumentation, CMM inspection, and root cause analysis
Generated technical documentation and validation reports
Skills Demonstrated
Mechanical testing, validation, root cause analysis, CMM inspection, documentation, cross-functional engineering
Makerspace Volunteering
Volunteer supporting public fabrication education through 3D printing and laser cutting workshops.
Highlights
Support hands-on 3D printing and laser cutting workshops for the public
Help children and adults learn CAD, fabrication, and maker skills
Teach workshop safety, equipment basics, and prototyping fundamentals
Skills Demonstrated
Teaching, workshop safety, fabrication, public communication, maker education
Tools and Software
CAD and Design
NX, SolidWorks, Fusion 360, Onshape, Blender
3D Scanning and Mesh Editing
Artec Studio, Geomagic, Blender, Fusion 360
Additive Manufacturing
Bambu Studio, OrcaSlicer, Cura, FDM, SLA, MJF, PolyJet
Fabrication and Inspection
Calipers, CMM inspection, 3D scanning, fitment analysis, laser cutting, hand tools, machine tools
Creative Tools
Adobe Photoshop, Illustrator, product photography, content editing
Work Experience
Seres / SF Motors - (2018 – 2024)
Electric Drive Units – Designed motor housings, lubrication, and cooling systems from ideation to commercialization.
Dynamometers – Tested, debugged, and repaired electric motors from prototype to production design.
Project Management – Aligned with other subsystems and negotiate with external customers and international vendors.
Resource Management – Scheduled and supported testing sessions for mechanical, electrical, and software teams.
Senior Mechanical Engineer (2019 – 2024)
Designed housings and components for electric drivetrain motors, gears, and batteries in CATIA V5, using solid and surface modeling, to be mass-manufactured with high-pressure die casting and lost foam casting methods.
Accomplished significant cost reductions in high-volume production by enhancing assembly and part design, optimizing manufacturing processes, and collaborating with international contract manufacturers.
Reduced assembly part count, standardized hardware, implemented innovative sealing techniques, and selected alternative off-the-shelf components.
Achieved successful delivery and provided ongoing support for our drivetrain package, which has been utilized in tens of thousands of SERES SF5 and AITO (Huawei) M5 cars on the road.
Collaborated with simulation engineers to facilitate their work by providing pre-processing models and conducting post-processing tasks such as optimization, correlation, and validation.
Utilized Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) within the ANSYS suite to conduct basic studies on stress, deflection, resonance, thermal, and flow.
Provided training and mentorship to interns, junior engineers, and technicians, fostering a positive and collaborative company culture.
Senior Test Engineer (2018 – 2019)
Developed and implemented Coordinate Measuring Machine (CMM) programs to automate the measurement and generation of detailed Geometric Dimensioning and Tolerancing (GD&T) reports for First Article Inspection (FAI) of electric drivetrain components.
Identified critical errors in position, runout, cylindricity, perpendicularity, flatness, and other GD&T parameters, providing proactive process feedback to volume suppliers to mitigate existing and potential manufacturing issues.
Led cross-functional collaboration by providing feedback to designers, guiding them to tighten critical tolerances and eliminate unnecessary specifications, resulting in improved performance, reliability, and reduced volume manufacturing costs.
Significantly shortened the time between design phase release by several months and saved tens of thousands of dollars by reducing outsourcing expenses.
Prototype Vehicle Engineer (jan 2018 – april 2018)
Fabricated electrical wiring harnesses and mechanical hardware mounts, successfully delivering a development "mule" vehicle within a three-month timeframe.
Diagnosed, debugged, and determined root causes of complex mechanical, electrical, and software challenges, ranging from vehicle system-wide problems to individual component-level intricacies.
Provided a robust testing platform for evaluating mechanical systems, power electronics, and control algorithms, resulting in a reduction of time and costs associated with early-stage product development.
Click below to see some Car and Garage related YouTube videos I’ve made.
Other Related Qualifications
Engineering Background – Comfortable reading and learning technical specifications, requirements, and capabilities of products.
Digital Content Production – YouTube experience, website and domain creation (Shopify, Etsy, Squarespace, Hover).
Automotive, Organization, and Tech Passion – Curiosity and interests aligned with Electric Supercar.
Building and manufacturing – Good at turning a wrench and prototype fabrication.