Mechanical Engineering Portfolio

Stephen Quartarone

A selection of engineering projects spanning manufacturing, mechanical design, robotics, CAD, 3D printing, analysis, and hands-on implementation.

View projects ↓ The quick version → Résumé ↗
01Selected work06 projects

View my favorite works

Each project opens into a full case study covering the problem, design process, manufacturing, analysis, and result.

P-01 CAD render of the dual-cavity polyurethane mold on its rolling base Case study ↗
Globe Composite · 2026

Dual-Cavity Polyurethane Mold

Designed a dual-cavity production mold to improve throughput, floor-space efficiency, and operator safety.

2×Production in the same floor space
≈ $600KProject allocation
P-02 Swing bolt demold system installed on a production mold Case study ↗
Globe Composite · 2026

Swing Bolt Demold System

Reduced demold time by 83% for a process completed 20–40 times per day.

12 → 2 minDemolding time per cycle
P-03 Redacted assembly drawing of the polyurethane test mold Case study ↗
Globe Composite · 2026

Polyurethane Test Molds

Developed six production test molds and a complete rolling test system for daily material evaluation.

6 moldsLeak-free and in daily use
P-04 Render of the autonomous mobile robot with its scissor lift Case study ↗
Northeastern · Spring 2025

Autonomous Mobile Robot

Designed and iterated a 3D-printed scissor-lift system for an autonomous warehouse robot.

Scissor liftRack-and-pinion, 3D printed
AutonomousLine tracking and obstacle sensing
P-05 CAD model of the PVC containment enclosure frame around the workpiece Case study ↗
Engineered Syntactic · 2026

Temporary Wire Saw Containment Enclosure

Created a rapid, low-cost enclosure to eliminate an airborne dust hazard during a critical repair.

DaysDesign to deployment
P-06 White 3D-printed modular parallettes with a wooden handle Case study ↗
Personal project · 2026

Parallette Gym Equipment

Designed, printed, tested, and validated a 3D-printed parallette using FEA and real-world calisthenics use.

0.90 MPaPeak stress under a 228 N load
02Working onIn progress

Working On

What I’m designing and building right now, from the hardware to the software that runs it.

WIP-01 Simulated run
Personal project · In progress

InsertPress

An automatic heat-set insert machine I’m designing and building. The goal: load a plate of 3D-printed parts, press start, and have the machine read the STL, find every insert hole, and press each brass insert square and flush on its own.

  • Designing and building the machine at Northeastern University’s EXP makerspace.
  • Spring-floated press head, a threaded insert pickup, and a closed-loop heated tip.
  • Companion Planner software, now on version 8: it reads the STL, finds the insert holes, checks the iron’s clearance, and generates the G-code for each run.
Design targetsM2–M5 inserts30-pocket tray200 × 200 mm bedNEMA 17 · GRBL 1.1
Try the Planner ↗ Source code ↗
03About me

Stephen Quartarone

I turn engineering problems into practical, well-designed solutions, from CAD and prototyping through manufacturing, testing, and implementation. I’m most energized by hands-on work and carrying ideas all the way through.

Mechanical DesignManufacturingRobotics AerospaceRapid Prototyping3D Printing
04Contact me

Let’s build something worth talking about.

I’m interested in mechanical design, manufacturing, aerospace, robotics, and product-development opportunities.

Email quartarone.s@northeastern.edu
LinkedIn/in/stephenquartarone↗ RésuméOpen PDF↗