Mechanical

The system shall store regolith, Mars powder, and rock/probe samples in 2–3 separate compartments, keeping sample types isolated from collection through storage.
The robotic arm shall use a scoop tool to collect sample material from the surface and deposit it onto the container's weighing platform.
Once loaded, the container shall weigh the total collected sample mass.
If the measured mass meets or exceeds the minimum threshold (100 g), the lid shall open via the motor, and the material shall be deposited into the appropriate compartment; the lid shall then close and lock automatically via magnetic caps mounted on the lid and container base.
If the measured mass falls below the threshold (100 g), the motor shall actuate to open the container and reject the sample rather than store it.

Compartment and lid actuation shall be motor-driven.
The full assembly shall fit within the housing dimensions defined for the system.
The lid shall open to a maximum of 90 degrees.
Probe mounting shall follow the dimensions specified in the Mars Rover Competition manual.
A piezoelectric sensor shall be integrated for mass measurement, mounted directly to the chassis.
The system shall be fully 3D-printed to satisfy overall weight limitations.
The weighing platform shall be constrained to a single degree of freedom in Z-translation, ensuring the platform remains stationary during measurement for accurate readings.

The locking mechanism shall maintain a secure seal under vibration and transport loads.
Each sampling operation shall require a minimum viable sample mass of 100 g.
If the measured mass is below 100 g, the system shall reject the sample automatically by opening the container rather than storing the material.