◆ Resin

Chess bishop mold

A 78 mm Staunton chess bishop to go with the pawn, from a rigid two-part print. Cast it in resin, no silicone.

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3D render of an ivory resin chess bishop with its slit mitre between the two printed halves of its rigid orange and blue mold
Resin ~147 g Pro early access

A classic Staunton bishop, 78 mm tall on a 36 mm foot: foot, bead, waisted body, a double collar and the mitre with its diagonal slit, topped with a small ball. It is sized to stand with the pawn from the same library.

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The mold is exactly what our two-part candle mold generator builds for this shape, set to resin: two rigid halves with rubber-band grooves, pry pockets and a pour funnel on the finial. The body is turned round one axis, and the slit in the mitre is cut from the front so it opens straight out of the front half, which is why the tool's own seam check finds nothing stuck.

A chess set needs four bishops, two of each colour: print the mold once and cast them in black and ivory resin, or in plaster and paint them. The zip carries both halves, the bishop 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 halves pulled apart around the bishop they cast, not a photo.

What you need

4
  • About 22 g of casting resin per bishop: the cavity holds 20 ml
  • Mold release spray or wax
  • Rubber bands or clamps
  • A craft knife and fine sandpaper for the sprue

How to cast it

5

  1. Print both halves as exported. Clamp-strength settings: 4 walls, 40% gyroid infill, no supports. Sand the seam faces flat if your first layer came out rough.

  2. Coat both cavities with mold release, working it into the slit in the mitre. Close the halves and band them along the whole seam.

  3. Mix the resin and pour it slowly down one side of the funnel so the air can leave through the other side.

  4. Leave it to cure fully, as long as the resin's datasheet says, then open the halves at the pry pockets.

  5. Cut the sprue off the top of the ball, sand it round and trim the thin line along the seam. Release again and cast the next bishop.

Print details

12 h 14 minPrint time
~147 gFilament
2Printed parts
46 × 56 × 97 mmSize (W x D x H)
All print details
Print details
Cast materialResin
Printed parts2
Size (W x D x H)46 x 56 x 97 mm
Print bed needed56 x 24 mm, 97 mm tall
Filament~147 g
Layer height0.2 mm
Infill40%
SupportsNot needed
DownloadZIP: 2 printed parts (STL) + bishop master (STL) + print sheet + recipe
Added2026-09-25

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

Make your own candle mold →

Made with the free Rigid box 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 candle mold guide.

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Questions about this design

Does the slit in the chess bishop fill properly with resin?

Yes, if the resin is thin enough. Pour a low-viscosity casting resin slowly and tap the closed mold for a minute, so any bubble caught in the slit rises out through the body to the funnel. A thick resin can leave the slit rounded at its bottom.

Will the chess bishop match the pawn from the same library?

Yes. Both are Staunton pieces drawn to the same set: a 50 mm pawn on a 30 mm foot and a 78 mm bishop on a 36 mm foot, the usual proportions for a set whose king stands about 95 mm. Cast them in the same resin and they sit together.

How do I weight the chess bishop so it does not tip over?

Resin pieces are already heavier than plastic ones. For a tournament feel, drop a few steel shot or a large washer into the foot end halfway through the pour, then top up; felt on the bottom covers it and protects the board.

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