How Jazza and Friends Built the World’s Biggest D20

Australian creator Jazza and the team at Lumin’s Workshop decided a regular gaming die was far too small. They set out to make a twenty-sided die big enough to claim the title of largest dice of any kind, and one that could still tumble and settle on a single face.

The concept began to take shape as the groups collaborated on the huge roach costume project. Discussions at that first meeting kept returning to the concept of scaling up a D20, which they had previously investigated, but this time they wanted to go even bigger to be able to roll it properly. John took on the interior framework, and because a conventional icosahedron has 12 vertices, they created 12 corner pieces to construct those points and 3D printed them. Solid aluminum bars were then screwed along every single outer edge to provide the necessary bracing to keep the design straight even when standing alone. Before ultimately locking everything in, they completed a dry fit with the entire frame, which had to be perfect for the faces to line up properly; a single tiny shift and the whole thing was off.

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Twenty faces followed, each starting as a 1.5-meter equilateral triangle. They’d sourced sheets of 20mm foam, and a custom jig helped cut the precise angles required to ensure the edges met perfectly when assembled. Because the foam was fairly thick, they had considered it into their estimations from the start, and layers were stiffened using contact cement to prevent flex. To avoid any gaps, we added extra foam strips to the outer frame bars.

The color and finish came next, with deep red paint applied in multiple coats because the foam soaked up so much of the first layer. We also needed to get the details right, so the edge details and rivet-style accents were painted with a yellow ochre base and then a metallic gold applied with a sponge for texture. Darker shading on the edges to give it an aged appearance, as well as some purposeful cracks to make it look like old stone or marble rather than plain foam, gave the finished die a strong presence.

With the die eventually completed, they required a trailer to transport it out of the factory, so they took it to Lumin’s factory in Campbellfield, outside of Melbourne, for some real-world testing. A trailer was required to haul the beast about, and lifting it and sending it tumbling down a slope resulted in some quite pleasant rolls that fell on various numbers, including one of those ultra-rare twentys when Jazza and a workshop mate assisted. The die is now housed inside the shop as both a display item and an office mascot.
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