Otto Rubber Shooter

I transformed the cute OTTO robot into a playful Rubber Shooter.

This remix modifies the top cover (HP_Toplights_R2) and adds a rotating rubber band cannon of my own design.

I added a simple rotating rubber band cannon to the robot’s top cover. Using a servo motor, it rotates smoothly and gradually releases rubber bands into the surroundings, allowing the robot to “shoot” in a fun way and hit targets.

How it works:

The cannon is inserted into a mount on the top cover and secured with a slight twist using a bayonet mechanism. Once locked, any further manual rotation transfers movement to the servo, which is why the cannon is designed to be removable and loaded outside the robot.

To reload, simply rotate the cannon in the opposite direction, remove it, load the rubber bands, and insert it back.

The robot remains fully programmable in the standard HP OTTO environment.

Practical tip:

Prepare 2–3 cannons in advance with preloaded rubber bands. This allows the robot to shoot almost continuously – while you just collect the rubber bands from the floor 🙂

Required parts:

• HP OTTO Starter / Creator kit (robot base)
• 1× 360° servo motor (continuous rotation servo – “motor wheel”); the original version can be requested via email at info@moravia-consulting.com
• Office rubber bands Ø approx. 30 mm, thickness ~1.5 mm (ideally natural rubber)

Printing recommendations:

• Recommended material is PLA.
• Maximum layer height is 0.2 mm.
• 4 perimeters.
• Nozzle temperature 215 °C.
• Perimeter speed 60 mm/s.
• Infill 15% (gyroid).
• Print without supports and without a brim.
• Supports are only required for the “Launcher” part.
• Place the seam on a non-visible side of the part for a better final appearance.

Assembly:

• Assembly is shown in the attached photos.
• The individual steps are intuitive and follow the design of the HP OTTO robot.