Bambu Studio projects for the P1S: every v3 part on 9 plates

print/3mf/sand-table-v3-P1S.3mf: every part oriented for printing, PLA case
parts and PETG moving parts, supports only on the arm motor bracket, stronger
walls on the hub, carriage and brackets, solid counterweight. Slices on all
9 plates: about 23.5 h, 760 g PLA + 165 g PETG.

print/3mf/sand-table-v3-P1S-options.3mf: 12.5 mm sand ring, M2 switch mount.

print/tools/make_3mf.py builds both from the STLs with the Bambu Studio
command line (flattened system presets, fixed-up per-filament settings).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

print/README.md

@@ -4,6 +4,7 @@
 
 | Folder | What |
 |---|---|
+| `3mf/` | **Bambu Studio projects** of the v3 set for a P1S, on plates with settings (see below). |
 | `v3/` | **The complete v3 set: every printed part.** New shell, deck, center plate, hub and slip-ring parts, seam plates and plugs, and a counterweight for the arm, plus copies of the unchanged parts (14–25). The rail bolts straight to the hub again (no `29c`). Print `00b-fit-test-6804` first. See "What changed in v3". |
 | `v2-current/` | The full v2 set, numbered in print order. Parts not replaced in a later folder still come from here. |
 | `v2.7-removable-arm/` | **Replaced by `v3`.** In v3 the rail bolts straight to the hub, so neither `29b` nor `29c` is used. `30` and `13` are copied into `v3/` unchanged. |
@@ -15,6 +16,16 @@
 | `v2.1-switch-update/` | **Also print these 2.** A new switch mount (it replaces `v2-current/14`) and a striker you glue onto the carriage. |
 | `v1-original/` | The first export, kept for reference. Don't print its `05-deck-Q1-arduino.stl`. |
 
+## Bambu Studio projects (P1S)
+`3mf/` has ready-to-print Bambu Studio projects for a P1S (0.4 mm nozzle, textured PEI plate):
+- **`sand-table-v3-P1S.3mf`:** every v3 part on 9 plates, turned the way it prints, with settings: supports only where needed, stronger walls on the hub, carriage and brackets, and a solid counterweight.
+  - Filament 1 is PLA (case parts), filament 2 is PETG (moving parts).
+  - About 23.5 hours and 760 g PLA + 165 g PETG in all.
+  - Print plate 1 (the fit tests) first.
+- **`sand-table-v3-P1S-options.3mf`:** the alternatives: the 12.5 mm sand ring (only for a raised floor, BUILD.md step 13) and the switch mount for M2 screws.
+
+They're built from the STLs by `tools/make_3mf.py` (it needs the Bambu Studio flatpak). Run it again after changing a part.
+
 ## Full parts list (v3)
 | Part | Folder | Notes |
 |---|---|---|