◆ Aroma beads

Butterfly car freshie mold

A butterfly car freshie with veined wings and a segmented body. Two per bake from a silicone mold you make.

Make your own tray mold
3D render of the printed caster for a two-cavity butterfly freshie mold, with three purple butterfly car freshies with veined wings in front
Aroma beads ~100 g Pro early access

A butterfly car freshie 99 x 75 mm and 10 mm thick: fore and hind wings with a margin line and veins, a segmented body and two short antennae. Each wing section is ringed by a ridge in the mold, so you can bake the wings in two colours or brush mica into the veins afterwards.

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Made with our tray mold generator in its flexible silicone tray mode: print the caster, pour a platinum silicone into it and peel out a mold for two butterflies. Bake the aroma beads in the silicone, never in the print. The hanging hole goes through the thorax, the strongest point, so the freshie hangs straight.

A spring and Mother's Day favourite that sells all year in pastel scents. The zip carries the printed caster exactly as the tool exported it, one freshie on its own as an STL, the master uploaded to the tool, and a print and pour sheet with the silicone figure the tool measured.

Shown as a 3D render of the printed caster with three butterflies in front, not a photo.

What you need

4
  • About 186 ml of platinum silicone rated for 200 C (400 F) or more
  • Unscented aroma beads, about 42 ml per freshie by volume, heaped
  • Freshie fragrance oil, two bead colours and pearl mica
  • A baking sheet, a skewer, and elastic cord to hang it

How to cast it

6

  1. Print the caster as exported, open side up, no supports. It never goes in the oven: it is only the form the silicone cures in, and PLA softens at about 60 C.

  2. Pour 186 ml of a platinum silicone rated for 200 C (400 F) or more into one corner in a thin stream, letting it rise over the shapes to the rim. Tap out the bubbles, let it cure and peel it out: that silicone is your freshie mold, with a post in each cavity for the hanging hole.

  3. A day or more ahead, shake unscented aroma beads with freshie fragrance oil in a lidded glass jar, about 1 oz of oil per pound of beads, and leave them until they feel dry. Shake in a pinch of mica for colour.

  4. Set the silicone mold on a baking sheet and fill each cavity level with the rim, then heap it slightly: the beads settle as they melt. Brush any beads off the top of each post.

  5. Bake at 300 to 350 F (150 to 175 C) for 10 to 15 minutes, in a ventilated kitchen and without leaving the oven, until the beads have fused but the top still looks beaded. Press with a skewer: done beads hold together.

  6. Let the mold cool completely, then flex it and pop the freshies out. Brush mica into the detail lines if you like, poke the hole clear with a skewer if a bead skinned over it, and hang it on an elastic cord where it touches nothing in the car.

Print details

3 h 20 minPrint time
~100 gFilament
1Printed parts
110 × 166 × 21 mmSize (W x D x H)
All print details
Print details
Cast materialAroma beads
Printed parts1
Size (W x D x H)110 x 166 x 21 mm
Print bed needed167 x 111 mm, 22 mm tall
Filament~100 g
Layer height0.2 mm
Infill15%
SupportsNot needed
DownloadZIP: printed caster (STL) + one freshie (STL) + tool master (STL) + print and pour sheet
Added2026-09-26

Pro early access until October 26, 2026, then free with any account.

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.

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 fill the antennae of the butterfly freshie?

Push single beads into the antennae with a skewer before you fill the wings, then heap the rest. The antennae are about 4 mm wide, the size of one or two beads, so they only come out whole if the beads are in them before the wings are filled.

How do I get a two-tone butterfly freshie?

Fill the outer band of each wing, outside the margin line, with one colour and the inside with another; the ridge holds the line while they bake. After cooling, a dry brush of pearl or holographic mica over the raised veins makes the pattern pop.

Is the butterfly freshie strong enough to hang by the hole?

Yes. The hole goes through the thorax, where the body and all four wings meet, so there is 10 mm of fused beads all round it. Hang it with a soft elastic cord rather than a thin wire, which can cut into a freshie on a hot day.

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