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Sand table v3: build fixes, bolted hub, counterweight, print guide

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- print/ reorganised: v1-original (first export), v2-current, the v2.1-v2.7 fixes
  found while building, and v3/ with every printed part.
- v3: deck screws you can reach, seam joints from outside, arm bolted straight
  to the hub, 6804 hub bearings with a 15 mm bore for connectors, clamp collar,
  counterweight, 12.5 mm sand ring for a raised floor, Uno turnaround plate.
- print/README.md: full v3 parts list, what changed and why, assembly order.
- docs/: diagrams for each change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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ckochandClaude Opus 5.5 committed 2026-11-01 13:40:23 -05:00
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README.md
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A 12" kinetic sand table that draws patterns in sand. A steel ball rolls under glass, pulled by a magnet on a polar arm underneath. The case is about 12.5" across and 5" tall. The parts are 3D-printed for a Bambu P1S and designed in SolidCraft.
- `sand-table-v2.solidcraft`: the printable design. Bodies named `REF_*` are bought parts, modeled for fit only.
- `sand-table-v2-assembly.step`: the full assembly, for viewing in any CAD tool.
- `print/`: STL files for every printed part, numbered in print order. Print `00-fit-test-coupon` first.
- `sand-table-v3.solidcraft`: the printable design (latest). Bodies named `REF_*` are bought parts, modeled for fit only. `sand-table-v2.solidcraft` is the previous version.
- `print/v3/`: STL files for every printed part of the v3 build. **Use this set.** Print `00b-fit-test-6804` first. `print/README.md` has the parts list, print notes and assembly order; the older folders are kept for reference.
- `software/`: the pattern player. Start it with `python3 -m sandtable web` for a web page with a library of designs; it drives the table from a computer over USB and erases between patterns. See `software/README.md`.
- `pcb/`: an optional custom controller board (ESP32 + 2× DRV8825, FluidNC) that fits the Uno standoffs, with PCBWay order files. See `pcb/README.md`.
- `sand-table-v2-assembly.step`: the v2 assembly, for viewing in any CAD tool.
- `design-notes.md`: how it works, dimensions, parts to buy, hardware list and print settings.
- `sand-table-v1.solidcraft`, `mechanism-mockups.solidcraft`: earlier layout and mechanism studies.