◆ Soap

Botanical soap bar tray mold

Four oval soap bars with a raised botanical sprig on top, poured into a printed tray.

Make your own tray mold Download free on Thingiverse
3D render of a printed orange tray with four oval soap cavities, and three pale green soaps with a raised leaf sprig in front
Soap ~216 g

A printed tray for four oval soap bars, each 90 x 60 mm and 24 mm tall, with a raised sprig across the top: a curving stem and six leaves standing a millimetre and a half proud of the soap.

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Made with our tray mold generator in its rigid tray mode: print the tray and pour melt-and-pour soap straight in. The sprig is pressed into the tray floor with sloped sides, so the bar lifts out clean and the leaves stay sharp.

The zip carries the tray exactly as the tool exported it, one soap 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 pale green soaps in front, not a photo.

Botanical soap bar tray mold at a glance: every printed part with its size, print time, filament, print settings and the three steps to use it

What you need

3
  • A PETG print of the tray
  • Melt-and-pour soap base, about 97 ml per bar
  • Colour, fragrance and rubbing alcohol in a spray bottle

How to cast it

4

  1. Print the tray as exported, cavities up, no supports. PETG is best: melt-and-pour soap goes in at about 60 C, which is where PLA starts to soften.

  2. Melt the soap base, stir in colour and fragrance, and pour each cavity to the brim. Spray the surface with rubbing alcohol to pop the bubbles.

  3. Let the soap harden for an hour or two, then give the tray 15 minutes in the freezer so the bars shrink away from the walls.

  4. Turn the tray over and press on the back of each cavity to pop the soaps out. Wrap them once they are at room temperature, or they sweat.

Print details

6 h 40 minPrint time
~216 gFilament
1Printed parts
207 × 144 × 30 mmSize (W x D x H)
All print details
Print details
Cast materialSoap
Printed parts1
Size (W x D x H)207 x 144 x 30 mm
Print bed needed207 x 145 mm, 31 mm tall
Filament~216 g
Layer height0.2 mm
Infill15%
SupportsNot needed
DownloadZIP: printed tray (STL) + one soap (STL) + tool master (STL) + print and pour sheet
Added2026-09-24
Make your own tray mold →

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

Download free on Thingiverse

Free download. Opens the Thingiverse listing in a new tab.

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 ice cube tray mold guide.

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Questions about this design

How do I make the leaf sprig a different colour from the bar?

Pour a teaspoon of green soap into the sprig first, just enough to fill the leaves, and spray it with alcohol. Let it skin over for a minute, spray again, then pour the main colour on top. The alcohol makes the two layers bond.

Will the botanical sprig survive in the shower?

The sprig wears down with the rest of the bar, which is part of the charm. It stays crisp for the first weeks; a harder base, such as a shea or goat milk melt-and-pour, keeps the detail longer than clear glycerine.

Is the botanical soap bar a good size to sell?

Yes. At about 97 ml each, the bars come out near 100 g, the most common size for handmade soap. The oval fits standard soap boxes and bands.

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