◆ Concrete

Concrete soap dish tray mold

Two concrete soap dishes with a rim and drain ridges, cast straight in a printed tray.

3D render of a printed orange tray with two soap dish cavities, and three grey concrete soap dishes with drain ridges in front
Concrete Pro early access

A printed tray for two soap dishes, each 110 x 75 mm and 14 mm thick, with a raised rim and six ridges across the top that hold the bar up out of the water so it dries between uses.

Made with our tray mold generator in its rigid tray mode: print the tray, wipe in release and pour a fine concrete or Jesmonite straight in. The dish is cast upside down, so the ridges form against the tray floor, and the back comes out flat for the bathroom shelf.

The zip carries the tray exactly as the tool exported it, one dish on its own as an STL, the master uploaded to the tool, and a print and pour sheet with the volume of each cavity.

Shown as a 3D render of the printed tray with three concrete dishes in front, not a photo.

What you need

  • Fine concrete, mortar mix or Jesmonite, about 101 ml per dish
  • Mold release or cooking oil
  • A concrete sealer for a bathroom

How to cast it

  1. Print the tray as exported, cavities up, no supports. PLA is fine.
  2. Wipe a thin film of mold release or cooking oil into every cavity, including the grooves.
  3. Mix a fine concrete or Jesmonite to a thick pour, fill each cavity, and vibrate it out: tap the tray on the table or hold a sander against the side for a minute until no more bubbles rise.
  4. Cover the tray and let it cure for 24 hours, then flex the tray and tip the pieces out. Sand the back flat, and seal them once they have dried for a few days.
Print details
Cast materialConcrete
Total print time10 h 33 min
Printed parts1
Size (W x D x H)125 x 173 x 21 mm
Filament~126 g
Layer height0.2 mm
Infill15%
SupportsNot needed
PrinterSliced with PrusaSlicer 2.7.2: 0.4 mm nozzle, 0.2 mm layers, 3 walls, 15% infill, MK3-class speeds. You pour straight into this tray, so PLA is fine: plaster and concrete only get warm as they set. No supports.
DownloadZIP: printed tray (STL) + one soap dishe (STL) + tool master (STL) + print and pour sheet
Added2026-09-24

Pro early access until October 24, 2026, then free with any account.

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.

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

New to casting? Read the ice cube tray mold guide.

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Questions about this design

Does a concrete soap dish need sealing?

Yes. Raw concrete soaks up water and soap and grows a dark ring. Let the dish dry for a week, then brush on two coats of a water-based concrete sealer or a food-safe wax. Jesmonite needs a sealer too if it lives by the sink.

How do I get the ridges on the soap dish crisp?

Use a fine mix with no gravel, pour it a little wetter than for a slab, and vibrate the tray well: the ridges are the deepest part of the cavity, and that is where air collects. Holding an orbital sander against the side of the tray works well.

How long before a concrete soap dish can be used?

Demold after 24 hours, then let it cure for about a week before sealing and using it. Keep it damp, under a plastic bag, for the first few days: concrete that dries too fast is weaker and dusts.

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