◆ Ice

Rocket popsicle mold

Three rocket popsicles per batch, stick grooves included. A food-safe silicone mold you make yourself.

Make your own tray mold
3D render of the printed caster for a three-cavity silicone rocket popsicle mold, with three red rocket ice pops on wooden sticks in front
Ice ~163 g Pro early access

The rocket ice pop of summer fairs and the Fourth of July: 42 mm wide and 96 mm long, three stepped tiers under a pointed nose, rounded on its face like the real thing and flat on its back. Each cavity holds about 51 ml and has its own groove for a standard 114 x 10 mm lolly stick.

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Made with our tray mold generator in its flexible silicone tray mode: print the caster, pour a food-safe platinum silicone into it and peel out a flexible three-rocket mold. The printed caster never touches food, only the silicone does. The tray tool closes every cavity with a thin silicone skirt, so each stick groove ends 3 to 4 mm short of the edge: snip that end wall out once with small scissors and the grooves are open for good.

An open tray lies flat, so a red, white and blue rocket is made in thick layers, a strawberry purée in the nose, yoghurt in the middle and a blueberry purée in the base, each firmed in the freezer before the next. The zip carries the printed caster exactly as the tool exported it, one rocket 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 rocket popsicles on their sticks in front, not a photo.

Rocket popsicle 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 262 ml of food-safe platinum silicone, Shore 10A to 20A (mix it in one batch)
  • Thick fillings, about 51 ml per rocket: strawberry and blueberry purée, yoghurt, or juice frozen to a slush
  • Wooden ice lolly sticks, 114 x 10 mm, and small scissors

How to cast it

7

  1. Print the caster as exported, open side up. It is one part, so there are no seams to seal. No supports.

  2. Set it on a level surface. Mix 262 ml of silicone in one batch and pour it into one corner in a thin stream, letting it flow round the raised shapes until it is level with the rim.

  3. Tap the caster on the table for a minute to bring the bubbles up, then let the silicone cure for as long as its datasheet says.

  4. Peel the cured silicone out of the caster. If the silicone's datasheet gives a post-cure, do it, then wash the tray in hot soapy water and rinse it before the first use. That silicone is your tray; the caster is ready for another one. At the end of each stick groove the tool left a thin silicone wall, 3 to 4 mm: cut down both sides of the groove to its floor with small scissors and lift that piece out, once.

  5. Set the tray level on a baking sheet. Spoon a thick strawberry purée into the nose of each rocket, freeze for 20 minutes, then yoghurt into the middle tier and freeze again. Keep the layers below the groove floor for now.

  6. Lay a wooden lolly stick in each groove with about 4 cm reaching into the rocket, then fill the base tier to the brim with a thick blueberry purée, which stays put at the open groove. Freeze for at least 4 hours, or overnight.

  7. Let the tray stand for two minutes, peel the silicone back from the nose and lift each rocket out by its base. Keep them in a freezer bag.

Print details

5 h 30 minPrint time
~163 gFilament
1Printed parts
162 × 116 × 32 mmSize (W x D x H)
All print details
Print details
Cast materialIce
Printed parts1
Size (W x D x H)162 x 116 x 32 mm
Print bed needed162 x 116 mm, 32 mm tall
Filament~163 g
Layer height0.2 mm
Infill15%
SupportsNot needed
DownloadZIP: printed caster (STL) + one rocket popsicle (STL) + tool master (STL) + print and pour sheet
Added2026-09-27

Pro early access until October 27, 2026, then free with any account.

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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 make red, white and blue layers in the rocket popsicle mold?

Use fillings thick enough to hold their place in a flat tray: a strawberry purée spooned into the nose, Greek yoghurt with a little honey in the middle tier, a blueberry purée in the base. Freeze for 20 minutes between layers so the colours stay apart, and lay the stick in before the last layer.

Can I pour plain juice into the rocket popsicle mold?

Up to the groove floor, yes. Above that, liquid runs out through the open stick groove, so freeze the first half until firm, lay the stick on it, and fill the rest with juice you have frozen to a slush in a cup for 40 minutes and stirred. Slush stays put and freezes onto the first half.

How do I get rocket popsicles out without snapping the stick?

Let the tray stand on the counter for two minutes, then peel the silicone back from the nose first and lift the pop out by its base, not by the stick. The rounded face lets the silicone roll off it. Pops that are frozen rock hard for a day come out cleaner than ones only just set.

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