Pig minifigure standing next to a large blue Primo brick surrounded by yellow, red and green System extensions.

How to join Lego Primo with System

Estimated reading time: < 1 minute

Earlier this year I built a miniature prototype for my StarWars × Fabuland MOC using a 1×1 Primo brick from 1995.

This oversized brick represents the iconic Tatooine homestead dome and allowed me to experiment with different sand formations gathering around the building.

’Fabulandspeeder’ Flickr album

Primo was a pre-Duplo range aimed at children aged 6-to-24 months, but was discontinued in 2006.

Lego Baby (Primo) Wikipedia article

System compatibility

Primo compatibility with other Lego elements is fairly minimal, but System elements of the same length and width can be attached to the bottom of Primo bricks (adapter pieces are also available).

For this MOC I used a blue 4×4 round plate to attach my Primo brick securely to the tan 16×16 plate.

Video demonstration

Primo connectivity video demonstration (available in 4K)

Top tip

DOTS keys are super useful for removing the plates if they get stuck.

DOTS Tile Remover Key (BrickLink listing)