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It's the magnets too - the NIB rare earth magnets enable permanent magnet motors that are much more efficient than before.

I wish someone would make some linear ones...

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Linear motors are a lousy business. They're almost all custom, while rotary motors are standardized. Prices seem to start around 10x the price of a comparable rotary motor. Find a market for a million identical ones and the price will come way down.

Some nice linear motors.[1] Even used on eBay, they're expensive.

[1] http://www.linmot.com/products/linear-motors/

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