◆ Crayons

Dinosaur crayon mold

Eight dinosaur crayons per bake: T. rex, long-neck, stegosaurus and triceratops, from broken old crayons.

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3D render of the printed caster for an eight-cavity dinosaur crayon mold, with four green crayons shaped like a T. rex, a long-neck, a stegosaurus and a triceratops in front
Crayons ~115 g

A silicone tray for eight chunky dinosaur crayons, two each of a T. rex, a long-necked sauropod, a stegosaurus with plates on its back and a triceratops with its frill and horns. Each is about 50 mm long and 12 mm thick, with an eye pressed in, and the set of four takes about 38 ml of melted crayon.

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Made with our tray mold generator in its flexible silicone tray mode: print the caster, pour a heat-proof platinum silicone into it and peel out the tray. The crayons melt in that silicone in the oven; the printed caster never goes near it. The silicone flexes round the legs, tails and horns, which a rigid mold would snap off.

Dinosaur crayons are a favourite party bag filler and a good use for a box of broken stubs: one colour per dinosaur, or a swirl. The zip carries the printed caster exactly as the tool exported it, the set of four dinosaurs 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 a set of four green dinosaur crayons in front, not a photo.

Dinosaur crayon 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
  • About 218 ml of platinum silicone rated for 200 C (400 F) or more
  • Broken wax crayons, peeled, about 38 ml of pieces per set of four
  • A baking sheet, a skewer and oven mitts

How to cast it

6

  1. Print the caster as exported, open side up, no supports. It never goes in the oven: PLA softens at about 60 C.

  2. Pour 218 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 the crayon mold.

  3. Soak old crayons in warm water for ten minutes, peel off the paper and break them into pieces about 1 cm long. Sort them by colour, or mix colours for swirled crayons.

  4. Set the silicone tray on a baking sheet. Push small pieces into the legs, tails and horns with a skewer first, then fill each dinosaur to the top and heap it a little: the pieces shrink as they melt.

  5. Bake at 230 to 275 F (110 to 135 C) for 10 to 20 minutes, until every piece has melted. Hotter makes the wax separate into a white film on top.

  6. An adult lifts the sheet out. Let the crayons cool for 30 minutes, give the tray 10 minutes in the freezer, then flex it and pop them out. Keep this tray for crafts, never food.

Print details

3 h 50 minPrint time
~115 gFilament
1Printed parts
124 × 171 × 24 mmSize (W x D x H)
All print details
Print details
Cast materialCrayons
Printed parts1
Size (W x D x H)124 x 171 x 24 mm
Print bed needed171 x 124 mm, 25 mm tall
Filament~115 g
Layer height0.2 mm
Infill15%
SupportsNot needed
DownloadZIP: printed caster (STL) + one set of four dinosaur crayons (STL) + tool master (STL) + print and pour sheet
Added2026-09-26
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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

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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 stop the legs breaking off the dinosaur crayons?

Let them cool completely, then 10 minutes in the freezer, before you touch them: warm wax is soft and snaps at the thinnest point. Peel the silicone back from each dinosaur instead of pushing it out, legs and tail first, and store them flat.

How many broken crayons fill the dinosaur crayon mold?

A set of four takes about 38 ml, so the full tray of eight needs roughly twice that, about 15 to 20 standard crayons once peeled. Fill every cavity heaped, because the pieces settle by about a third as they melt.

Can I use the dinosaur mold for chocolate after crayons?

No. Once crayon wax has been in the silicone, keep the tray for crafts: the pigments stay in the surface. For chocolate dinosaurs, pour a second tray from the same caster in a food-safe platinum silicone and keep that one for food only.

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