Base-12 Meditation Vajra — 144 mm
A custom handheld meditation vajra (dorje) in base-12 geometry, generated parametrically in Python. Two sizes, one set of proportions: the 144 mm standard and a 120 mm version that fits standard 125 mm casting flasks. Spin the piece in 3D, download the manufacturing files, and read the foundry spec.
Flask-friendly size — fits standard 125 mm casting flasks; the 144 mm plus its sprue exceeds them.
The 3D viewer could not start (WebGL or library load issue).
You can still download the full mesh below — start with the STL file.
Drag to rotate · pinch or scroll to zoom · left half satin finish, right half mirror polish
For casters — start here
This page is the complete job packet. Four steps:
- Pick a size with the toggle above — 144 mm (standard) or 120 mm (fits standard 125 mm investment flasks). The specifications on this page follow your selection.
- Download the mesh and the spec sheet for that size from the grid below — the STL (or OBJ for CAD work) plus the matching Foundry Spec Sheet PDF. All meshes are modeled 1:1 in millimeters.
- Quote this process: lost-wax investment casting from a 3D-printed castable resin pattern — no rubber master mold needed (one-off piece). Alloy: C87300 silicon bronze (C83600 red brass acceptable). Scale the pattern 1.018× for shrinkage. Finish: satin on one end, mirror polish on the other (marked in the spec sheet).
- Send the quote — price and lead time for each size, please — to Rodney A. Ripley Jr., droiden.rr@gmail.com · 330-420-8444. The size choice will be made on price.
Download the files
Everything a caster or machine shop needs. All meshes are modeled in millimeters at 1:1 finished scale. Both sizes are generated from the same parametric model — quote both and compare.
Base12_Meditation_Vajra_144mm.stl
144 mm full-resolution casting mesh · 179,136 triangles · 8.9 MB
⬇ Download .STLBase12_Meditation_Vajra_120mm.stl
120 mm flask-friendly casting mesh · 179,136 triangles · 8.9 MB
⬇ Download .STLBase12_Meditation_Vajra_144mm.obj
144 mm mesh in OBJ · 6.1 MB · Rhino, Blender, ZBrush, jewelry CAD
⬇ Download .OBJBase12_Meditation_Vajra_profile.dxf
144 mm 2D profile drawing · 60 KB · verify lengths & diameters
⬇ Download .DXFFoundry_Spec_Sheet.pdf
Printable specification sheet (144 mm) · 72 KB · dimensions, alloys, shrinkage, finishing
⬇ Download spec sheetFoundry_Spec_Sheet_120mm.pdf
Printable specification sheet (120 mm flask-friendly) · 72 KB · same spec, 120 mm dimensions
⬇ Download spec sheetbase-12-vajra-3d-rendering.html
Standalone offline 3D viewer · 7.9 MB · mesh baked in, no internet needed
⬇ Download viewergenerate_vajra_dual_size.py
The dual-size parametric generator (numpy only) · source of truth for both sizes
⬇ Download sourceFoundry Spec Sheet (online)
The spec for the currently selected size, right in this page — opens as an overlay, printable.
Specification — 144 mm
| Part name | Base-12 Meditation Vajra (144 mm) |
|---|---|
| Process requested | Lost-wax investment casting from a 3D-printed castable resin pattern — no rubber master mold required (one-off piece) |
| Preferred casting alloys | C87300 Silicon Bronze (~95% Cu) — preferred · C83600 Red Brass (~85% Cu) acceptable |
| If CNC machining instead | C14500 Tellurium Copper (~99.5% Cu). Near-pure copper is difficult to investment-cast in this thin open-cage geometry; C14500 is the machining route only. |
| Overall bounding box | 144.0 mm (L) × 39.0 mm (W) × 34.1 mm (H) — width measured across the outer prong cage |
| Central hub | ⌀ 24.0 mm nominal 12-sector fluted sphere (24.5 mm max across flutes) |
| Lotus collars | 28.7 mm envelope, 31.0 mm max across petal crests · 12 petals per side |
| Prong geometry | 1 central twisted-hexagonal shaft + 6 outer prongs per end · prongs ⌀ 4.8 mm at root, 12° taper into faceted diamond tips |
| Mesh volume / est. weight | 30.1 cm³ → approx. 265 g finished in silicon bronze |
| Shrinkage compensation | Scale the mesh by 1.018× (+1.8% to +2.0%) before printing the pattern, for an exact finished length |
| Surface finishing | One end (−Z): 220-grit bead-blasted satin · Other end (+Z): mirror buff polish. The split finish is deliberate — it lets the holder feel the piece's orientation by touch. |
Casting notes
- Two sizes, one geometry: the 120 mm version is the identical base-12 model at 1U = 10 mm instead of 12 mm — same proportions, same details, ~42% less metal by volume. Quote both sizes; the 120 also fits standard 125 mm investment flasks that the 144 (plus sprue) exceeds.
- Sprue & gating: the 6 outer prongs per side form an open cage around the central shaft. Attach the main feed sprue to the very tip of one end, or feed into the central hub sphere with small auxiliary vents on the outer prong arches, so metal flows through all six prongs without trapping air.
- Thin sections: minimum wall is the prong tube (⌀ 4.8 mm at root on the 144, ⌀ 4.0 mm on the 120, tapering toward the tips). Silicon bronze's fluidity is requested specifically for clean fill of the lotus petals and prongs.
- Why bronze for casting, tellurium copper for CNC: casting alloys like C87300/C83600 flow smoothly into thin detail without trapping gas. C14500 machines cleanly (the tellurium keeps it from gumming cutters) but absorbs oxygen and shrinks unevenly when cast — so it is the machining option only.
- Quote checklist: the STL or OBJ above + the process request (“lost-wax investment casting from a 3D-printed castable resin pattern in Silicon Bronze C87300”) + this spec. That is enough for an accurate quote — no master-mold setup fee applies to a one-off from a printed pattern.
Studio renders
Rendered from the 144 mm mesh (silicon bronze, satin left / polished right).
