An autonomous, table-top Rubik’s Cube concept build focused on compact packaging, low-friction actuation,
and repeatable alignment. Our team was selected as 1 of 24 teams across Harvard, MIT, and Olin.
We set out to build an autonomously solving Rubik’s Cube that would solve from its scrambled state after being
set down on a table. The project centered on fitting electronics and actuation into a compact form factor while
preserving the tactile behavior of a real cube (low friction, true face rotations, and reliable alignment).
High-level constraint: we repeatedly ran into the tradeoff between enclosure size and cube
accessibility/manipulation, especially once real wiring, motors, and boards were introduced.
DESIGN GOALS
Fit all electrical components internally.
Rotate exactly like a Rubik’s Cube with low-friction rotation.
Individually actuate faces for controlled turns.
Achieve repeatable alignment using closed-loop control.
ENGINEERING CHALLENGES
Packaging
Underestimating the footprint of motors, electronics, and wiring.
Balancing enclosure size with accessibility and manipulation.
Early geometry choices limiting internal space for components.
Mechanism + repeatability
Maintaining low friction while ensuring positive engagement with each face.
Designing for alignment repeatability (closed-loop intent).
Managing tolerances and post-processing effects from SLA prints.
RESULTS
We printed all pieces needed for a full cube and packaged electronics within the spherical core.
Key limitation: the spherical core was still not large enough to fit all electronic components with room for a power connection.
LEARNINGS & NEXT STEPS
Learnings
Rapid task-splitting and clear communication enabled fast iteration under time pressure.
SLA printing reinforced tolerance design, post-processing needs, and the impact of print orientation on accuracy.
Next steps
Scale/clean up the enclosure to better fit electronics and wiring.
Improve alignment and motor control for more reliable manipulation.
Redesign center pieces/connection mechanisms for compactness and torque robustness.
