The Rollie robot is a compact, box-shaped robot built entirely using LEGO Spike Prime components. It incorporates
six Technic Gear 28-Tooth Double Bevel gears,
even though the standard Spike Prime set includes only five. If you don't have a spare gear, you can substitute
the two front gears with a
Technic Connector Circular with 2 Pin Holes and 3 Axle Holes,
or any other compatible gear available in the set. Rollie is engineered with a minimalist design approach, using a limited number
of parts from both the base set and the expansion pack, making it efficient and easy to rebuild.