◆ Plaster

Plaster scroll corbel mold

A classic scroll corbel, 150 mm tall, with volutes and a carved leaf. Cast it in plaster as a shelf bracket or decor.

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3D render of the scroll corbel master with its volutes and front leaf fused on its printed charcoal base, between the orange and blue shell halves, with the charcoal clamps behind
Plaster ~675 g Pro early access

A traditional scroll corbel 150 mm tall, 88 mm deep and 64 mm wide: a stepped top plate, a big volute under it and a small one at the foot joined by an S curve, spiral grooves on both sides, and a pointed leaf with a midrib and veins down the front. The back is flat, to glue or screw against a wall.

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Made with the hugging-shell mode of our silicone mold maker. The site's mold advisor suggests a box for this shape, and a box works, but it takes 1.14 litres of silicone; the shell follows the corbel's outline and takes about 458 ml for the same casts. Print the base with the corbel fused onto it on its back, the two shell halves and the clamps, pour the silicone, and cast through the open back.

Cast in casting plaster, Hydrocal or Jesmonite, a pair of these holds a small shelf, frames a doorway or sits under a mantel. The zip carries every printed part, the corbel master 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 pulled apart around the master, not a photo.

What you need

4
  • About 496 ml of silicone (mix it in one batch)
  • Casting plaster, Hydrocal or Jesmonite: each cast is 632 ml
  • Tape or a hot glue gun for the shell seams
  • Construction adhesive or two screws and wall plugs to mount it

How to cast it

7

  1. Print the base, which has the corbel master already fused onto it on its back, the two shell halves and the clamps (all of them are in clamps.stl). No supports.

  2. Stand the shell halves on the base around the master and push the printed clamps over the seams. Steel binder clips work too, the seats for them are built into the shell.

  3. Tape the outside seams or run a bead of hot glue along them, because silicone finds every gap.

  4. Mix 496 ml of silicone in one batch, pour it into the open top in a thin stream, and fill level with the rim.

  5. Once it has cured, unclip the shell, lift it off and peel the silicone off the master. That silicone is your mold.

  6. Turn the silicone over and set it back in the shell to keep its shape: the opening is the flat back of the corbel. Mix the plaster, brush a thin coat into the volutes and the leaf first, fill to the top and tap the shell for a minute to raise the air.

  7. Strike the back flat with a ruler while the plaster is still soft. After an hour peel the silicone off, and let the corbel dry for a few days before you paint or seal it.

Print details

22 h 30 minPrint time
~675 gFilament
9Printed parts
110 × 200 × 109 mmSize (W x D x H)
All print details
Print details
Cast materialPlaster
Printed parts9
Size (W x D x H)110 x 200 x 109 mm
Print bed needed200 x 108 mm, 109 mm tall
Filament~675 g
Layer height0.2 mm
Infill15%
SupportsNot needed
DownloadZIP: 9 printed parts in 4 STL files + corbel master (STL) + print sheet + recipe
Added2026-09-25

Pro early access until October 25, 2026, then free with any account.

Make your own silicone mold →

Made with the free Silicone mold maker generator. Upload your own model and get the same kind of mold built around it, in your browser.

Free for personal use. Selling the pieces you cast needs a commercial licence (Pro or Founder); passing on the file itself is not permitted on any plan. Full terms.

New to casting? Read the silicone mold maker guide.

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Questions about this design

Can the plaster scroll corbel hold a shelf?

A light one. Cast in a hard plaster such as Hydrocal, or in Jesmonite, a pair holds a short shelf of books or plants. Screw each corbel to the wall through two holes drilled after it has dried, and never rely on glue alone under a load. Plain plaster of Paris is decor only.

How do I get the spiral grooves on the corbel crisp?

Brush a thin first coat of plaster into the volutes before you fill the mold, then tap the shell for a full minute. Mix the plaster slowly so no air goes in. If a groove still has a bubble, fill it with a little wet plaster on a fingertip once the corbel is out.

How much silicone does the scroll corbel mold take?

About 460 ml for the hugging shell this zip carries. The same corbel in a square box would take 1.14 litres, which is why the shell was chosen. The mold is reusable for dozens of casts.

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