Charlot Lab · Physical AI × Material Science × Additive Manufacturing
A readiness map for building a humanoid entirely by additive manufacturing, every actuator subsystem, what AM can do today with hard numbers, and the one wall it can't cross.
Everything in additive manufacturing for robots splits into two worlds. A fully-printed humanoid lives in the gap between them, which is why no one has built one.
Metal AM. Every subsystem, cores, windings, magnets, flexures, is individually demonstrated at high performance.
Polymer AM. The entire robot already prints in one shot, including its control logic as printed fluidic transistors.
Each actuator subsystem, the AM processes that reach it, the best result demonstrated to date, and an honest technology-readiness estimate. TRL is shown as a nine-layer deposition stack.
The standard radial BLDC is optimized for machining and winding, not printing. These are the print-native alternatives, ranked by how much of each one AM can actually make.
You cannot print a power MOSFET, GaN, or SiC die, or an MCU. These require crystalline-semiconductor fabrication; printed and organic thin-film transistors cannot switch motor-level power. Printed electronics reaches the board, interconnect, passives, and even PCB-trace encoders, but not the active power and logic silicon. This is the only subsystem AM genuinely can't cross. There are two ways through it.
Trade "printed" for "ours." A self-fabricated open die (SKY130 / GF-class) is a coherent, arguably stronger, sovereignty claim than pretending a printed transistor can drive 40 A. The lab already fabricates silicon.
Printed fluidic logic already controls whole actuated robots end to end, diodes and pressure-gain "transistors" printed in a single run. Zero silicon, at the cost of speed and power density.
In the rigid regime, every piece is proven but:
In the soft regime, the whole robot prints in one shot but can't carry a biped's loads.
The track's thesis is the bridge: rigid-regime force density, soft-regime one-print integration, and printed-or-self-fabbed control, accounted in joules per joint, released CC0 as prior art.
Four capabilities, four separate research communities. No group occupies the intersection, multi-material AM + morphology/control co-design + print-native actuation at humanoid load. The nearest institutional analog is a wind-turbine program.
No single machine spans structural polymer + soft-magnetic steel + copper + magnet + elastomer. It's a process portfolio. Here is the optimal process per subsystem, the frontier that consolidates them, and the sequence to build.
The minimum viable stack is three machine classes: (1) polymer powder: MJF or SLS, for structure, gears and flexures; (2) multi-material metal LPBF for the electromagnetic actuator; (3) material-jetting or direct-ink-write for soft actuators and sensors. Metal LPBF is the capability-defining, expensive one.
The single machine that collapses the actuator core: Aerosint's selective powder deposition prints 316L steel + CuCrZr copper in one LPBF build, exactly the soft-magnetic-core-plus-winding pairing a motor needs. No platform yet spans metal + polymer + functional inks in a single system. Owning that convergence is the manufacturing-research frontier, and the moat.