◆ Clay

Faceted vase slip casting mold

A four-piece plaster mold for slip casting a low-poly faceted vase, 122 mm tall with triangle facets.

Make your own plaster slip-cast mold
3D render of four printed plaster-mold housings for a faceted low-poly vase, orange and blue shells beside charcoal bases, with a white fired geometric vase in front
Clay ~5038 g Pro early access

A geometric vase 96 mm across and 122 mm tall once fired, made of octagonal rings turned half a step against each other, so every band is a ring of flat triangles catching the light. It holds 343 ml to the brim.

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Made with our plaster mold generator: a printed housing per plaster piece, you pour the plaster, and the plaster is the mold. The page's seam check found nothing stuck at any piece count. It is still a four-piece mold, two facets to a piece, because with fewer pieces the facets next to each seam run almost straight along the pull and smear their sharp edges on the way out. Open at the mouth, mold cut 15% oversize for a 13% shrinkage slip.

The zip carries the four bases, one shell and clamp set that fits all four, the vase as its own STL, the tool's print sheet and a recipe file for the generator.

Shown as a 3D render of the printed bases and shells with the fired piece in front, not a photo.

What you need

4
  • About 880 ml of casting slip to fill the mold (most of it pours back out)
  • Pottery plaster (No. 1 Pottery or similar), enough to fill each housing to the top of its shells
  • Mold soap or petroleum jelly, and strong rubber bands or mold straps
  • A pencil to number the plaster pieces

How to cast it

8

  1. Print the 4 bases and the one set of shells and clamps, no supports. The sheet in the zip asks for 4 or more walls and 40% gyroid, because the shells get clamped.

  2. Stand the two shells round the first base, slide the clamps over the ends, and run a thin bead of petroleum jelly along every seam. Brush mold soap over the printed master slice and the natch sockets so the plaster lets go.

  3. Sift pottery plaster into water (about 100 g of plaster to 70 g of water), let it slake for two minutes, mix for three, then pour it up to the top of the shells and tap the housing to lift the bubbles.

  4. After 30 to 45 minutes, when the plaster is warm and hard, unclamp, lift the shells off and ease the plaster piece off the base. Move the same shells and clamps to the next base and pour again.

  5. Let the plaster pieces dry for about a week somewhere warm and airy, until they feel light and no longer cool to the touch. A damp mold barely takes water out of the slip.

  6. Band the 4 pieces together with the natches seated, stand the mold mouth up and fill it to the rim with slip. Top it up as the level drops.

  7. When the wall is 3 to 4 mm thick (usually 10 to 20 minutes, check at the rim), pour the slip back out and leave the mold upside down to drain.

  8. Once the cast loses its shine and pulls away from the plaster, trim the rim, open the mold and lift the piece out. Dry it slowly to bone dry, then bisque and glaze fire.

Print details

168 hPrint time
~5038 gFilament
8Printed parts
191 × 244 × 108 mmSize (W x D x H)
All print details
Print details
Cast materialClay
Printed parts8
Size (W x D x H)191 x 244 x 108 mm
Print bed needed245 x 180 mm, 108 mm tall
Filament~5038 g
Layer height0.2 mm
Infill40%
SupportsNot needed
DownloadZIP: 4 bases + one shell and clamp set (8 printed parts, STL) + vase master (STL) + print sheet + recipe
Added2026-09-25

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

Make your own plaster slip-cast mold →

Made with the free Plaster slip-cast mold 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 plaster mold guide.

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Questions about this design

How do I keep the faceted vase's edges sharp?

Open the mold as soon as the cast pulls away, not before, and handle the vase by the rim and the foot only. Fettle the seams with a dry blade held flat on a facet, never across an edge, and sponge it with a barely damp sponge.

Why is the faceted vase mold four pieces when nothing is stuck at two?

Stuck is not the only problem. At two pieces the facets beside each seam have almost no draft, so the plaster slides along them as it opens and can drag their edges. Four pieces give every facet a clear angle to leave by.

What glaze suits the faceted vase?

A glossy or satin glaze that breaks at edges makes every facet show. A matte white shows the shape through light and shadow alone. Avoid a thick, runny glaze: it softens the edges the vase is all about.

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