RefrigDNA SenseNode — CLAMP CAD & 3D-PRINT RECIPE
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Rev A1 · canonical spec "Rev C" (116 x 68 x 42.5 mm · clamp Ø6.35–28.6 · M4x0.7)
You do NOT need to model from scratch. Pick ONE route below to get a printable STL.

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ROUTE A — OpenSCAD  (fastest, zero CAD skill)         file: 01_Source_CAD/RDNA-CLAMP-BODY.scad
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1. Install OpenSCAD (free, openscad.org) on the Lenovo tower.
2. Open RDNA-CLAMP-BODY.scad.
3. Set the pipe size: edit  pipe_d =  to your line (6.35=1/4", 9.53=3/8", 22.23=7/8", 28.6=1-1/8").
4. Set  PART = "body";  press F6 (full render), then File > Export > Export as STL.
5. Set  PART = "jaw";   F6, export again.
6. You now have two STLs -> slice & print (settings below). Assemble with an M4 pin + M4 screw.

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ROUTE B — FreeCAD macro  (you already have FreeCAD)   file: 03_FreeCAD/RDNA-CLAMP_freecad_macro.py
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1. FreeCAD > Macro > Macros... > Create > name it RDNA_clamp > paste the .py contents.
2. Edit  OUT_DIR  near the top to a real folder (e.g. your Desktop).
3. (Optional) edit pipe_d for your line size.
4. Press the green Run arrow. It builds body + jaw and writes:
      RDNA-CLAMP-BODY.stl   and   RDNA-CLAMP-JAW.stl
5. Slice & print.

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ROUTE C — Fusion 360 hand-model  (best for refining toward production)
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Use this when you want clean, editable production CAD rather than generated geometry.
1. New design. Units = mm.
2. Sketch the enclosure footprint 116 x 68 on the XY plane; extrude 42.5 (this is the envelope).
3. On the bottom face, sketch a circle of Ø = (pipe_d + 2*1.5 pad); cut-extrude a channel ALONG
   the 116 length (pipe axis = the long axis) — this is the clamp bore + silicone pad gap.
4. Split the body with a plane through the pipe axis: upper = body, lower = jaw band (~48 long).
5. Add a hinge (knuckles + Ø4 pin bore) on one long edge at the split; add an M4 (Ø4.3) latch
   hole on the opposite edge.
6. Shell the upper body (3 mm wall) for the PCB cavity; add the 1/4" SAE service boss on top;
   add a USB-C slot on one end.
7. Add the sensor-mount bosses LAST — these are the only numbers not in the spec sheets
   (token CAD-03). Measure them from your chosen modules (TMP117 / ADXL355 / SPU0414 / pressure)
   and place bosses to seat each at its contact point.
8. Export STL (or STEP for the laser interface plates).

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3D-PRINT SETTINGS (library FDM, prototype)
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- Material: PLA or PETG for fit checks. (Production target is the spec's aluminum/PC — not printed.)
- Layer height 0.2 mm · 3+ perimeters · 20–30% infill.
- Orientation: print BODY cavity-up; print JAW channel-up (supports off / minimal).
- Print the test coupon fit first; verify the M4 holes and the pin bore before a full clamp.
- Check the clamped bore on your real pipe; tweak pad_t / fit_clear and re-export if tight.

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ASSUMPTIONS TO CONFIRM  (marked // TODO-CAD in the files)
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- Internal sensor-mount boss positions (CAD-03) — depend on YOUR sensor modules; not on the sheets.
- USB-C slot + service-port boss exact location — placeholders; set to your PCB.
- The hinge/latch are a functional approximation of the sheets' "hinged clamp + adjusting screw."
Everything else (envelope, bore range, wall, M4) is taken from the canonical Rev C datasheet.

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THEN: the laser interface plates
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Once the clamp STL exists, follow dossier Part 7 (Fusion/FreeCAD > project flat geometry > DXF)
to cut CORE-01/02 sensor-interface plates to the real internal surfaces. Until then, the two
SVGs already in 04_SVG_Master (coupons + rig base) are the parts that need no clamp geometry.