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The Play & freeze ice cream ball is pretty neat, but a little pricey @ $28+
"With the unique Play & Freeze Ice Cream Maker, you can make ice cream anywhere! You dont need electricity, just add ice and rock salt in one end and ice cream mix in the other endthen have a ball as you shake it, pass it or roll it! The ice cream mix can be as simple as cream, sugar and vanilla. Try flavors from our recipe list included or make up your own. Made of durable polycarbonate, its lightweight, portable and easy to clean." [via] - Link.
Here's a DIY version that could be put inside some type of sphere too... MAKE 06 - Home Made Ice-Cream... without a refrigerator! Lower the temperature of ice with salt and use it to freeze your own ice-cream! - PDF & Link.
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I'd go with the homemade one. We had the commercial one and it never really worked. FYI.
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Bob "Surreal Gourmet" Blumer uses a salad spinner as the entropy source for the homemade version. The theory with that is that the cream which freezes gets less dense, and as a result tends towards the center, helping it to churn and keeps the denser (liquid) parts in closer contact with the ice.
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We always used nested coffee cans which could be rolled back and forth across the floor.
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The guys from Food Jammers did something very similar to this while camping, just to see if they could. It was basically a can in a can, sealed with tape and kicked around.
Later on in the episode, they used a washing machine motor geared down to about 60RPM to churn the cream in a bucket that was in a freezer.
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I have the pint sized ball and it works great
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