06 · LLDPE

SphericonRoller.

Rotomoulded play equipment, ages 3–5

Course: ID200 · Rotational moulding · ARMSA 2025
Year: 2025

Render of the blue SphericonRoller on a sunlit timber floor

A rotomoulded LLDPE sphericon that turns a straight push into a wobbling, multi-axis roll, for balance and gross-motor play.

Brief

Design a rotationally moulded product. Entered in the ARMSA 2025 student competition.

Idea

Most push toys only roll in one direction. A sphericon rolls in an oscillating path, which works balance and the vestibular system far more. The main hazard in free-rolling play objects is over-rolling, so the form has built-in stops and handles sized for a 3–5-year-old's grip.

Making

Surfaced in SolidWorks with uniform wall thickness for the rotomould, then proven as a 1:6 FDM model, filled, primed and spray-finished, and rolled in a scale room to check the path.

Render of the orange SphericonRoller tipped on its edge against green — On its edge mid-roll.

The painted 1:6 FDM model in a scale bedroom with a child figure for scale — 1:6 model in a scale bedroom.

The 1:6 model in two positions, showing its roll path — The roll path, two positions.

Render of the roller on a parquet floor in front of a screen — Render.

ARMSA poster: rotomoulded LLDPE, SANS 71-1 compliant, with a child-scale drawing — ARMSA poster.