A compact two-wheel platform with a rear ball caster and a removable body interface. The screen, arm servos and voice hardware live in the upper character.
98 × 49 mmFootprint, wheels included
61.3 mmBase height, locating keys included
33 partsModelled solids and component envelopes
$93.93 + motorsPriced required hardware · USD
Current decision: the motor geometry fits, but supply is unresolved. Hardware blocks are dimensioned placeholders; this revision is for review, not a released print-and-build kit.
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02 / LOOK CLOSER
Review images & video
Rendered from the actual CAD
Common baseRounded shell and keyed top dockElectronics layoutBoard envelopes above the batteryDrive bayTwo independent motors and passive casterUpper hardware carrierScreen and servos belong to the removable bodyExploded assemblyShells, trays, battery and drive partsTurntable360° rendered review · Download MP4
USD prices checked 29 September 2026. Optional distance sensor adds $14.95. Shipping, tax, PCB work and the cosmetic character body are excluded. Allowances are estimates, not supplier quotes.
Robot components, vendor links and prices
Component
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Total USD
Availability / note
Loading component list. The PDF is also available above.
Browse individual parts — STEP files and printable STLs
05 / DESIGN RECORD
Decisions & next steps
Established in this model
98 × 49 mm footprint, including both wheels.
Rear caster and two drive wheels meet the same floor plane.
0.8 mm minimum modelled tire-to-shell clearance.
Four-point 32 × 44 mm body mount with asymmetric locating keys.
Display, arm servos, microphone and speaker remain in the upper body.
33 valid solids; no unintended intersections. Tire interference is deliberate.
Still to resolve
Source the drive motors or select a replacement and revise the mounts.
Validate battery current, protection and simultaneous actuator loads.
Measure bought parts and finish clamps, PCB supports and servo brackets.
Design the body connector, wiring or a compact carrier PCB.
Test print fits, arm motion, centre of gravity and dynamic stability.
29 SEP 2026 · V0.1
Initial hardware packaging and common base. The rounded reference informed the appearance; the narrow width produces an elongated base. A generic upper carrier demonstrates component placement without fixing a character design.
The 57.5 mm shell roof and 61.3 mm key height are provisional. This first layout is taller than the visual reference; a carrier PCB may reduce height, but that is not yet established. No runtime, payload or durability rating is claimed.
