MTG — Saga Chapter Dial (I / II / III / IV) with Snap-Fit Pointer

A small ornate dial for tracking which chapter of a Saga

enchantment you're currently on. Saga cards in Magic: the Gathering

have 3 or 4 chapter abilities (printed I, II, III, IV) that trigger

in sequence — this dial lets you mark the active chapter at a glance

without a fistful of +1/+1 counters or a dice that gets bumped.

Layout

                I
               ╱│╲
              ╱ │ ╲           ← rotating pointer
         IV ──┼─┼─── II
              ╲ │ ╱
               ╲│╱
                │
               III


- **55 mm disc** with engraved laurel-wreath border and Roman numerals
  at the cardinal points (12 / 3 / 6 / 9 o'clock = I / II / III / IV).
- **Snap-fit pointer** drops onto the centre post and rotates freely.
- Inner / outer ring engravings frame the numeral band.

## What you print

The body+accents are a **coordinate-locked two-colour print**:

- combined.stl — ASCII multi-solid (body + accents) for Bambu
  Studio's *Split to Parts* workflow. **Recommended.**
- body.stl — filament A (dark dial body) — single-colour fallback.
- accents.stl — filament B (gold engraving plugs) — drop into the
  body's recesses if printing the parts separately.
- pointer.stl — the rotating pointer (separate small part).

## Bambu AMS workflow (recommended)

1. **Import** combined.stl into Bambu Studio.
2. **Right-click** the imported object → *Split to Parts*.
3. Two sub-parts named body and accents appear, locked at exact
   coordinates.
4. Assign **filament A (dark / structural)** to body.
5. Assign **filament B (gold / accent)** to accents.
6. **Import** pointer.stl separately, assign filament B.
7. Slice. Print flat on the bed, no supports.

> Why combined STL with named solids? Bambu's "Add Part" workflow
> rearranges coordinates — the gold accents would land off-centre.
> A single ASCII STL with two named solids + Split-to-Parts
> preserves alignment exactly.

## Single-colour fallback

If you don't have AMS, print only body.stl + pointer.stl and
accept a monochrome dial — the engravings are recessed and remain
legible. Or pause-and-swap filament at the layer where the laurel
band starts.

## Snap-fit centre post

The dial's centre post has a 0.25 mm-interference snap ridge; the
pointer's slotted bore compresses past the ridge once on assembly,
then locks the pointer in place but free to rotate. Tuned per the
mana-counter recipe in the source repo
(docs/research/snap_fit_post_and_slotted_bore.md).

## Print settings

- Bambu Lab P2S or any 0.4 mm FDM
- 0.2 mm layer height, 2 walls, 15 % infill
- PLA Basic
- **No supports**
- Dial: print **face UP** on the bed (engravings on top)
- Pointer: flat

## Source

Full parametric .scad is included. Variables at the top of the
file control diameter, border ornament density, font, and snap-fit
tolerances.

Fan content for **Magic: the Gathering** by Wizards of the Coast —
not affiliated.