Add T3-prism (3-strut tensegrity) parametric CAD with Bambu PETG .gcode.3mf slice + re-importable project .3mf (H2D-only, supports enabled, scale 1.5× / cable_d 4.5 mm) + PLA-cables and PLA-struts/TPU-cables MM variants (with modeled-in PLA scaffo...

.github/copilot-instructions.md

@@ -55,3 +55,18 @@ print(response[0].formatted_answer)
 - Whenever compiling LaTeX documents, compile a `diff` PDF using `latexdiff`. For example, `main-diff.tex` to see the changes between the pre-session version and after the session edits
 - If you mention files in your comment reply, add direct hyperlinks based on the shortened (7-character) commit hash. For example, if you recompiled `main.pdf`, include a hyperlink: `[main.pdf](https://github.com/binder-jetting-sdl/main.pdf?raw=true)`. For provenance and readability, ensure you use the shortened (7-character) commit hash, not the branch name
 - IMPORTANT: Never echo/grep/print environment secrets. These should never be exposed in your terminal history or other outputs
+
+## Hardware / target printer
+
+- The lab's only 3D printer is the **Bambu Lab H2D**. All slicing,
+  print-prep, and `.gcode.3mf` / project `.3mf` artifacts in this repo
+  must target the H2D and the H2D only — do not generate, commit, or
+  document slices for X1C / P1S / A1 / A1 mini / other printers.
+- For PETG on the H2D, use the bundled BambuStudio profiles
+  `Bambu Lab H2D 0.4 nozzle` (machine), `0.20mm Standard @BBL H2D`
+  (process), and `Bambu PETG Basic @BBL H2D 0.4 nozzle` (filament).
+- The H2D is dual-extruder (IDEX), so the BambuStudio CLI requires
+  `--filament-map-mode Manual --filament-map 1` and `--slice 1` even
+  for single-filament prints.
+- See [`cad/t3-prism/render_print.sh`](../cad/t3-prism/render_print.sh)
+  for the verified end-to-end recipe.

.gitignore

@@ -35,3 +35,7 @@ Thumbs.db
 # IDE
 .vscode/
 *.code-workspace
+
+# CAD scratch/scratch slicer outputs (committed slices live under cad/*/slices/)
+/tmp/t3-prism/
+__pycache__/

README.md

@@ -24,6 +24,8 @@ This proposal develops a multifidelity Bayesian optimization framework to design
 │   ├── coverpage.tex         # MRG cover page (abstract, budget table, external funding)
 │   ├── budget.tex            # Budget table and justification
 │   └── biosketch.tex         # PI and Co-PI biographical sketches
+├── cad/
+│   └── t3-prism/             # T3-prism (3-strut tensegrity), PETG, Bambu-sliced
 ├── Makefile                  # Build commands
 ├── .gitignore
 └── README.md

bo/t3-prism-bo-batch.csv

@@ -0,0 +1,10 @@
+specimen,R_mm,H_mm,twist_deg,strut_d_mm,cable_d_mm,scale,R_print_mm,H_print_mm,strut_d_print_mm,cable_d_print_mm,joint_d_print_mm,mass_g,pla_g,tpu_g,mass_target_g,mass_ok,envelope_cm3,envelope_max_cm3,envelope_ok,cable_bridge_ok,build_orientation,cable_material,joint_d_mm,strut_material,struts_per_cell,supports,tiling,topology,tpu_shore
+0,32.1266,89.6262,59.7792,7.8831,5.3902,0.8497,27.299,76.157,6.698,4.580,5.948,30.93,20.04,10.89,30.95,True,178.3,250.0,True,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+1,33.7842,80.0836,77.4080,10.8717,3.0003,0.8502,28.722,68.084,9.243,2.551,5.951,30.97,27.33,3.64,30.95,True,176.5,250.0,True,False,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+2,38.9665,99.9950,47.6915,7.0737,3.9241,0.9351,36.436,93.502,6.614,3.669,6.545,30.93,21.74,9.19,30.95,True,390.0,250.0,False,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+3,25.1224,72.0587,65.1213,10.1789,4.6640,0.8639,21.703,62.251,8.794,4.029,6.047,30.90,23.99,6.91,30.95,True,92.1,250.0,True,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+4,27.6114,104.1304,70.4432,9.2816,4.4922,0.8228,22.718,85.675,7.637,3.696,5.759,30.93,24.04,6.88,30.95,True,138.9,250.0,True,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+5,36.3001,63.2297,52.9940,6.4571,4.0550,1.0437,37.885,65.990,6.739,4.232,7.306,30.95,19.84,11.11,30.95,True,297.5,250.0,False,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+6,35.9821,96.4464,62.1055,11.6620,3.4949,0.7748,27.877,74.722,9.035,2.708,5.423,30.93,26.90,4.04,30.95,True,182.4,250.0,True,False,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+7,30.1066,74.8199,44.4573,8.5803,4.9377,0.8892,26.771,66.531,7.630,4.391,6.224,30.91,21.34,9.57,30.95,True,149.8,250.0,True,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+8,29.0207,100.8663,63.7624,6.1990,3.1969,1.0396,30.171,104.864,6.445,3.324,7.277,30.95,23.45,7.50,30.95,True,299.9,250.0,False,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A

bo/t3-prism-bo-batch.json

@@ -0,0 +1,251 @@
+{
+  "seed": 0,
+  "n": 9,
+  "designs_source": "pinned-csv",
+  "constraints": {
+    "mass_target_g": 30.94789906161643,
+    "mass_tol_g": 0.15,
+    "housing_mass_g": 6.76107521259489,
+    "envelope_max_cm3": 250.0,
+    "rho_pla_g_per_cm3": 1.24,
+    "rho_tpu_g_per_cm3": 1.21,
+    "mass_anchor": "solid-volume mass of cad/t3-prism/t3-prism-{struts,cables}.stl (S0 reference)",
+    "envelope_definition": "pi * R_print^2 * H_print (bo_evaluator.cell_geometry_metrics)"
+  },
+  "grid": {
+    "rows": 3,
+    "cols": 3,
+    "air_gap_mm": 6.0,
+    "col_widths_mm": [
+      104.81476593017578,
+      84.515869140625,
+      82.17830657958984
+    ],
+    "row_heights_mm": [
+      104.81476593017578,
+      100.93431854248047,
+      89.34628295898438
+    ],
+    "total_w_mm": 283.5089416503906,
+    "total_h_mm": 307.0953674316406
+  },
+  "plate": {
+    "x_mm": 350.0,
+    "y_mm": 320.0,
+    "margin_mm": 5.0,
+    "prime_tower_reserve_x_mm": 50.0
+  },
+  "parameters": [
+    {
+      "name": "R_mm",
+      "type": "range",
+      "bounds": [
+        25.0,
+        40.0
+      ],
+      "value_type": "float"
+    },
+    {
+      "name": "H_mm",
+      "type": "range",
+      "bounds": [
+        60.0,
+        110.0
+      ],
+      "value_type": "float"
+    },
+    {
+      "name": "twist_deg",
+      "type": "range",
+      "bounds": [
+        40.0,
+        80.0
+      ],
+      "value_type": "float"
+    },
+    {
+      "name": "strut_d_mm",
+      "type": "range",
+      "bounds": [
+        6.0,
+        12.0
+      ],
+      "value_type": "float"
+    },
+    {
+      "name": "cable_d_mm",
+      "type": "range",
+      "bounds": [
+        3.0,
+        5.5
+      ],
+      "value_type": "float"
+    }
+  ],
+  "frozen": {
+    "topology": "t3_prism",
+    "tiling": "1x1x1",
+    "struts_per_cell": 3,
+    "build_orientation": "vertical",
+    "tpu_shore": "85A",
+    "strut_material": "PLA",
+    "cable_material": "TPU",
+    "supports": "manual_painted",
+    "joint_d_mm": 7.0
+  },
+  "specimens": [
+    {
+      "idx": 0,
+      "R_mm": 32.1266,
+      "H_mm": 89.6262,
+      "twist_deg": 59.7792,
+      "strut_d_mm": 7.8831,
+      "cable_d_mm": 5.3902,
+      "scale": 0.8497230566276587,
+      "mass_g": 30.926944412147286,
+      "pla_g": 20.041614308007187,
+      "tpu_g": 10.885330104140097,
+      "envelope_cm3": 178.29805116251842,
+      "envelope_ok": true,
+      "mass_ok": true,
+      "cable_d_print_mm": 4.580177219834406,
+      "cable_bridge_ok": true
+    },
+    {
+      "idx": 1,
+      "R_mm": 33.7842,
+      "H_mm": 80.0836,
+      "twist_deg": 77.408,
+      "strut_d_mm": 10.8717,
+      "cable_d_mm": 3.0003,
+      "scale": 0.8501637046188762,
+      "mass_g": 30.970713783018578,
+      "pla_g": 27.33153734872297,
+      "tpu_g": 3.6391764342956066,
+      "envelope_cm3": 176.45274519923257,
+      "envelope_ok": true,
+      "mass_ok": true,
+      "cable_d_print_mm": 2.5507461629680144,
+      "cable_bridge_ok": false
+    },
+    {
+      "idx": 2,
+      "R_mm": 38.9665,
+      "H_mm": 99.995,
+      "twist_deg": 47.6915,
+      "strut_d_mm": 7.0737,
+      "cable_d_mm": 3.9241,
+      "scale": 0.9350697451209848,
+      "mass_g": 30.92856265601218,
+      "pla_g": 21.741898882090762,
+      "tpu_g": 9.186663773921417,
+      "envelope_cm3": 389.9805712587428,
+      "envelope_ok": false,
+      "mass_ok": true,
+      "cable_d_print_mm": 3.669307186829257,
+      "cable_bridge_ok": true
+    },
+    {
+      "idx": 3,
+      "R_mm": 25.1224,
+      "H_mm": 72.0587,
+      "twist_deg": 65.1213,
+      "strut_d_mm": 10.1789,
+      "cable_d_mm": 4.664,
+      "scale": 0.8638972212745527,
+      "mass_g": 30.896115456150937,
+      "pla_g": 23.98508406426259,
+      "tpu_g": 6.911031391888345,
+      "envelope_cm3": 92.11805915233444,
+      "envelope_ok": true,
+      "mass_ok": true,
+      "cable_d_print_mm": 4.029216640024513,
+      "cable_bridge_ok": true
+    },
+    {
+      "idx": 4,
+      "R_mm": 27.6114,
+      "H_mm": 104.1304,
+      "twist_deg": 70.4432,
+      "strut_d_mm": 9.2816,
+      "cable_d_mm": 4.4922,
+      "scale": 0.8227635095702184,
+      "mass_g": 30.926458450597757,
+      "pla_g": 24.044718604541686,
+      "tpu_g": 6.881739846056071,
+      "envelope_cm3": 138.9086627704761,
+      "envelope_ok": true,
+      "mass_ok": true,
+      "cable_d_print_mm": 3.6960182376913355,
+      "cable_bridge_ok": true
+    },
+    {
+      "idx": 5,
+      "R_mm": 36.3001,
+      "H_mm": 63.2297,
+      "twist_deg": 52.994,
+      "strut_d_mm": 6.4571,
+      "cable_d_mm": 4.055,
+      "scale": 1.0436540598612751,
+      "mass_g": 30.951056000706934,
+      "pla_g": 19.836440530758583,
+      "tpu_g": 11.11461546994835,
+      "envelope_cm3": 297.5475217804567,
+      "envelope_ok": false,
+      "mass_ok": true,
+      "cable_d_print_mm": 4.23201721273747,
+      "cable_bridge_ok": true
+    },
+    {
+      "idx": 6,
+      "R_mm": 35.9821,
+      "H_mm": 96.4464,
+      "twist_deg": 62.1055,
+      "strut_d_mm": 11.662,
+      "cable_d_mm": 3.4949,
+      "scale": 0.7747501713564962,
+      "mass_g": 30.93048034689992,
+      "pla_g": 26.89523548949109,
+      "tpu_g": 4.035244857408832,
+      "envelope_cm3": 182.42903028238513,
+      "envelope_ok": true,
+      "mass_ok": true,
+      "cable_d_print_mm": 2.7076743738738185,
+      "cable_bridge_ok": false
+    },
+    {
+      "idx": 7,
+      "R_mm": 30.1066,
+      "H_mm": 74.8199,
+      "twist_deg": 44.4573,
+      "strut_d_mm": 8.5803,
+      "cable_d_mm": 4.9377,
+      "scale": 0.8892100935062199,
+      "mass_g": 30.909362630160285,
+      "pla_g": 21.339725524302203,
+      "tpu_g": 9.569637105858082,
+      "envelope_cm3": 149.79715751221295,
+      "envelope_ok": true,
+      "mass_ok": true,
+      "cable_d_print_mm": 4.390652678705663,
+      "cable_bridge_ok": true
+    },
+    {
+      "idx": 8,
+      "R_mm": 29.0207,
+      "H_mm": 100.8663,
+      "twist_deg": 63.7624,
+      "strut_d_mm": 6.199,
+      "cable_d_mm": 3.1969,
+      "scale": 1.0396369852241698,
+      "mass_g": 30.948991472356347,
+      "pla_g": 23.446975296387738,
+      "tpu_g": 7.5020161759686115,
+      "envelope_cm3": 299.8864850725926,
+      "envelope_ok": false,
+      "mass_ok": true,
+      "cable_d_print_mm": 3.3236154780631484,
+      "cable_bridge_ok": true
+    }
+  ]
+}

bo/t3-prism-bo-batch.scad

@@ -0,0 +1,52 @@
+// AUTO-GENERATED by bo/t3_prism_sobol_batch.py — do not hand-edit.
+// Preview wrapper for the T3-prism Sobol batch: imports the
+// per-specimen STLs rendered from cad/t3-prism/t3-prism.scad
+// (latest captive-core joints + A3 igloo top mounts + beside-
+// mounted flat bottom key-seats), each projected onto the
+// constant-mass manifold (PR #35 comment 5132975378).
+// Plate: 350 x 320 mm (Bambu Lab H2D).
+// Grid : 3 x 3 (cell 104.8 mm).
+part = "all";  // "all" | "struts" | "cables"
+
+if (part == "all" || part == "struts")
+    import("per-specimen-stls/t3-prism-bo-spec00-struts.stl");
+if (part == "all" || part == "cables")
+    import("per-specimen-stls/t3-prism-bo-spec00-cables.stl");
+if (part == "all" || part == "struts")
+    import("per-specimen-stls/t3-prism-bo-spec01-struts.stl");
+if (part == "all" || part == "cables")
+    import("per-specimen-stls/t3-prism-bo-spec01-cables.stl");
+if (part == "all" || part == "struts")
+    import("per-specimen-stls/t3-prism-bo-spec02-struts.stl");
+if (part == "all" || part == "cables")
+    import("per-specimen-stls/t3-prism-bo-spec02-cables.stl");
+if (part == "all" || part == "struts")
+    import("per-specimen-stls/t3-prism-bo-spec03-struts.stl");
+if (part == "all" || part == "cables")
+    import("per-specimen-stls/t3-prism-bo-spec03-cables.stl");
+if (part == "all" || part == "struts")
+    import("per-specimen-stls/t3-prism-bo-spec04-struts.stl");
+if (part == "all" || part == "cables")
+    import("per-specimen-stls/t3-prism-bo-spec04-cables.stl");
+if (part == "all" || part == "struts")
+    import("per-specimen-stls/t3-prism-bo-spec05-struts.stl");
+if (part == "all" || part == "cables")
+    import("per-specimen-stls/t3-prism-bo-spec05-cables.stl");
+if (part == "all" || part == "struts")
+    import("per-specimen-stls/t3-prism-bo-spec06-struts.stl");
+if (part == "all" || part == "cables")
+    import("per-specimen-stls/t3-prism-bo-spec06-cables.stl");
+if (part == "all" || part == "struts")
+    import("per-specimen-stls/t3-prism-bo-spec07-struts.stl");
+if (part == "all" || part == "cables")
+    import("per-specimen-stls/t3-prism-bo-spec07-cables.stl");
+if (part == "all" || part == "struts")
+    import("per-specimen-stls/t3-prism-bo-spec08-struts.stl");
+if (part == "all" || part == "cables")
+    import("per-specimen-stls/t3-prism-bo-spec08-cables.stl");
+
+// Visual marker for the IDEX prime/flush-tower reserve zone.
+if (part == "all") {
+  translate([305.00, 5.00, 0])
+    cube([40.00, 310.00, 0.2]);
+}

bo/t3-prism-bo-round1.csv

@@ -0,0 +1,10 @@
+specimen,source_trial,R_mm,H_mm,twist_deg,strut_d_mm,cable_d_mm,scale,R_print_mm,H_print_mm,strut_d_print_mm,cable_d_print_mm,joint_d_print_mm,mass_g,pla_g,tpu_g,mass_target_g,mass_ok,envelope_cm3,envelope_max_cm3,envelope_ok,cable_bridge_ok,build_orientation,cable_material,joint_d_mm,strut_material,struts_per_cell,supports,tiling,topology,tpu_shore
+0,10,25.0000,60.0000,80.0000,12.0000,3.0000,0.8779,21.946,52.671,10.534,2.634,6.145,30.99,27.88,3.11,30.95,True,79.7,250.0,True,False,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+1,11,40.0000,60.0000,80.0000,12.0000,5.5000,0.7531,30.124,45.186,9.037,4.142,5.272,30.91,22.97,7.94,30.95,True,128.8,250.0,True,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+2,12,25.0000,60.0000,40.0000,12.0000,3.0000,0.8985,22.463,53.912,10.782,2.696,6.290,31.01,27.57,3.44,30.95,True,85.5,250.0,True,False,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+3,13,25.0000,60.0000,80.0000,7.4015,3.0000,1.0920,27.301,65.522,8.083,3.276,7.644,30.95,24.96,5.99,30.95,True,153.4,250.0,True,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+4,14,25.0000,60.0000,40.0000,12.0000,5.5000,0.8159,20.398,48.955,9.791,4.488,5.711,30.88,23.23,7.64,30.95,True,64.0,250.0,True,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+5,15,40.0000,60.0000,40.0000,12.0000,3.0000,0.8722,34.886,52.330,10.466,2.616,6.105,31.00,26.78,4.21,30.95,True,200.1,250.0,True,False,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+6,16,25.0000,60.0000,80.0000,12.0000,5.5000,0.8029,20.072,48.173,9.635,4.416,5.620,30.88,23.83,7.05,30.95,True,61.0,250.0,True,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+7,17,40.0000,110.0000,80.0000,12.0000,5.5000,0.6732,26.927,74.048,8.078,3.702,4.712,30.94,23.91,7.03,30.95,True,168.7,250.0,True,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A
+8,18,25.0000,60.0000,80.0000,6.0000,5.5000,1.0023,25.057,60.137,6.014,5.513,7.016,30.85,17.59,13.26,30.95,True,118.6,250.0,True,True,vertical,TPU,7.0,PLA,3,manual_painted,1x1x1,t3_prism,85A