Rune Die — a d6 numbered in real runic numerals

Rune Die — a d6 numbered in real runic numerals

A 16 mm d6 whose six faces carry the runes the Norse actually used as the numbers 1–6. Not letters standing in for digits — genuine numerals.

Long-branch (Danish) Younger Futhark. Opposite faces sum to 7, right-handed standard European layout.

Why runes, and why only a d6

The futhark alphabets have no numerals. Norse texts spell numbers out as words or borrow Roman numerals. The one genuine runic number system is the medieval runic calendar — the Swedish runstav — which ran the weekday runes and the golden numbers 1–19.

The golden-number cycle is the 19-year Metonic cycle, so it stops dead at 19. There is no rune for 20 and there never was; post-1500 almanacs simply switched to Arabic digits.

That is why this is a d6 and not a dice set. Faces 1–6 sit comfortably inside both cycles, so every mark on this die is historical and nothing is invented.

The stave

Each face also carries the stave — the groundline the runes were carved along on a runstav. It is not decoration. A square face rests in four orientations, and every rune here is a vertical stem with marks hung off it, so a face read upside down is a perfectly plausible-looking rune, just the wrong one. The stave pins "down" absolutely, and does it with a period-correct mark rather than a dice-maker's underline dot.

The six runes are mutually non-rotatable without it too, so the die stays readable even if you ignore the stave entirely.

Letterforms

Drawn the way they were cut: straight chiselled strokes, no curves anywhere. The rounded bowls in a digital rune font are a 20th-century type designer's reading of shapes originally cut as two straight lines meeting at a corner. Straight strokes are also what a 0.4 mm nozzle renders crisply at 9 mm cap height.

Two ways to print

• Single colour — print rune_d6.stl. The runes are crisp recesses 0.6 mm deep, ready for acrylic paint-fill: flood the recess and wipe the face flat with a card before it dries.

• Two colour (Bambu AMS) — print rune_d6_2color.stl. That is one file holding two named solids. In Bambu Studio: Import → right-click → "Split to Parts", then assign a filament to body and one to runes. Coordinates are preserved exactly, so the inlays land in their pockets.

Both filaments must be the same polymer — PLA+PLA or PETG+PETG. PLA against PETG is a deliberate breakaway interface; the runes would pop out.

The two-colour die is the fairer one

Filling the pockets flush with a second colour of the same polymer puts the engraved material back. body + ink measures against the un-engraved die to 4e-13 mm³, and the assembled centre of mass lands 3e-16 mm off centre — the two-colour die is a solid cube again. It is the same thing casino dice do by filling their pips with flush paint.

Print settings

• 16 mm across the flats, 0.9 mm rounded edges. Any face on the bed.

• 0.2 mm layers, no supports, ~20 min.

• Infill 100 % — print it solid. A d6 is a fairness device, and gyroid at 40 % leaves a different amount of plastic behind each face. Treat 40 % as the floor for a display piece; anything you actually roll should be solid.

• Turn ironing off on the top face for the two-colour version — it drags one colour across the other on the flush inlays.

• Two-colour purge dwarfs the die: ~28 g per plate against a 4.9 g die, because runes on all six faces means ink on nearly every layer. That is per plate — print six at once and a full set costs the same purge as one.

Colour choice matters more than usual here

Pick two filaments far apart in brightness, not just in hue. The photographed die is teal with cream runes, which sit close in value: in hand it reads fine, but under warm light the shadowed faces lose their contrast. Near-black with bone, or a light body with dark ink, reads much better.