◆ Ice
Large ice cube tray, 2 inch whiskey cubes
Six 2 inch whiskey ice cubes per tray. A food-safe silicone mold you make yourself.
◆ Ice
Six 2 inch whiskey ice cubes per tray. A food-safe silicone mold you make yourself.
The large ice cube a whiskey glass wants: about 2 inches (50 mm) on every side, with 6 mm rounded corners and softly rounded edges. One cube fills a rocks glass and melts slowly, so the drink chills without watering down. This tray makes six at a time, each about 122 ml of water.
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 six-cube tray. The printed caster never touches food or drink, only the silicone does, and a big cube twists out of silicone whole where it would crack out of a rigid tray.
The cube measures 49 mm at the face and widens by a degree or two toward the open side so it lets go, about 2 inches half way up. The zip carries the printed caster exactly as the tool exported it, one cube 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 ice cubes in front, not a photo.
Print the caster as exported, open side up. It is one part, so there are no seams to seal. No supports.
Set it on a level surface. Mix 577 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.
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.
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.
Boil distilled or filtered water twice and let it cool: that drives out most of the air that clouds ice. Set the tray on a baking sheet and fill each cavity to just below the rim, since water grows about a tenth as it freezes.
For clear cubes, stand the tray in a small insulated cooler with its lid off in the freezer, so it freezes from the top down, for 6 to 8 hours or overnight. The cloud ends up in the bottom face: take the cubes out while it is still slushy, or trim it off.
Let the tray stand for a minute, then twist it at both ends and peel it back from each piece. Store the ice in a freezer bag so the tray is free for the next batch.
Print details
| Cast material | Ice |
|---|---|
| Printed parts | 1 |
| Size (W x D x H) | 182 x 124 x 64 mm |
| Print bed needed | 183 x 125 mm, 64 mm tall |
| Filament | ~609 g |
| Layer height | 0.2 mm |
| Infill | 15% |
| Supports | Not needed |
| Download | ZIP: printed caster (STL) + one cube (STL) + tool master (STL) + print and pour sheet |
| Added | 2026-09-27 |
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.
Use directional freezing. Boil distilled water twice, fill the tray, and stand it inside a small insulated cooler with the lid off in the freezer, so the ice can only freeze from the top down. The air and minerals are pushed to the bottom face, the last part to freeze: take the cubes out while that face is still slushy, or trim the cloudy layer off with a warm knife.
Six to eight hours in a home freezer, and up to a day in a cooler for clear ice, so freeze them the night before. A cube is done when it rings hard when tapped. Let it stand for a minute before it goes in the glass: straight from a very cold freezer it cracks when the drink hits it.
Every cavity widens by about two degrees toward its open side, which is what lets a tall cube leave the silicone without being pulled. It is about 2 inches half way up and a millimetre or two either side of that at the face and the back, which nobody sees in a glass.
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