# sandTable

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.

**Building one? Start with [BUILD.md](BUILD.md):** parts to buy, what to print, assembly in order, wiring, the first run and troubleshooting.

- `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 the two fit tests (`00`, `00b`) 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.