◆ Plaster
Cast the Augustus of Prima Porta as a 140 mm statue in plaster or concrete, from a museum scan.
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The Augustus of Prima Porta as a 140 mm statue: the first Roman emperor in armour, his right arm raised to address his troops, the carved breastplate on his chest and a little Cupid riding a dolphin at his feet. The marble from the 1st century AD was found in 1863 at the villa of his wife Livia and is in the Vatican Museums.
The master is a 3D scan of the plaster cast of the Augustus of Prima Porta in the Royal Cast Collection of SMK, the National Gallery of Denmark, published by SMK as public domain. The mold is made with the hugging-shell mode of our silicone mold maker, the mode the site's own mold advisor picks for a statue: every fold and limb would lock a rigid two-part mold, and silicone peels out of them.
Cast it in plaster or Jesmonite for a shelf or a history teacher's desk, or in fine concrete for the garden. The same mold also takes resin, soap or candle wax.
Print the base with the statue fused onto it, the two shell halves and the six clamps that hold them shut (all six are in clamps.stl, no binder clips needed), pour about 200 ml of silicone, and cast in the flexible mold that comes out. The zip carries every printed part, the statue as its own STL, the tool's own print-settings sheet and a recipe file for the generator.
Shown as a 3D render of the printed mold parts, the six printed clamps and the cured blue silicone mold they make, not a photo.
Print the base, which has the statue already fused onto it, the two shell halves and the six clamps (all six are in clamps.stl, laid out on one plate). No supports.
Seat the two shells on the rim of the base around the statue and push the six printed clamps over the wings, three down each seam, so the shell is clamped shut from top to bottom. Steel binder clips work too.
Tape the outside seams or run a bead of hot glue along them, because silicone finds every gap.
Mix 225 ml of silicone in one batch and pour it into the opening on top in a thin stream. Stop once silicone rises in the small air vent.
Once it has cured, pull the thin strand of silicone out of the vent, take the six clamps off, lift the shells away and peel the silicone off the statue. That silicone is your mold.
Before the first cast, read the notes in PRINT-SETTINGS.txt: if they flag air trapped in the cast, cut a thin vent in the cured silicone from that spot toward the opening with a craft knife, so the plaster fills it.
Set the silicone back in the shell to keep its shape, and pour plaster, Jesmonite or fine concrete into it through the opening the base left. Tap it for a minute so the bubbles rise.
Print details
| Cast material | Plaster |
|---|---|
| Printed parts | 9 |
| Size (W x D x H) | 101 x 102 x 159 mm |
| Print bed needed | 102 x 85 mm, 160 mm tall |
| Filament | ~195 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: 9 printed parts in 4 STL files + statue master (STL) + print sheet + recipe |
| Added | 2026-10-05 |
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About 200 ml, so mix 225 ml in one batch. The shell follows the figure, which is why it takes far less than a box around a statue this size would. A tin or platinum casting silicone of Shore 20 to 30 A works well.
With six printed clamps, all in clamps.stl in the zip. The two shell halves have wings along both seams; push three clamps over each seam, top, middle and bottom, and the shell is closed tight with no gap for silicone to escape. Tape or a bead of hot glue along the outside seams on top of that makes it leak-proof. If you have steel binder clips, a few more never hurt, but you do not need them.
From SMK, the National Gallery of Denmark. Its Royal Cast Collection holds plaster casts of famous sculptures, made in the 19th century so artists could study them, and SMK has 3D scanned many of them and published the scans as public domain. This is their cast of the Augustus of Prima Porta in the Vatican. We only cut it flat under the plinth, scaled it and simplified the mesh for printing.
Yes, if the cast has hardened fully and you peel the silicone back from the arm first. For a statue that gets handled, Jesmonite is stronger than plaster at the raised hand.
Yes. They are all scans from the same museum collection, made at a matching shelf size (most stand 140 mm tall), so a few of them cast in the same plaster make a small sculpture gallery for a shelf or a mantelpiece.
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