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Electrically heated butter dish.
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NormanV:
Edward, when I found that company, after I had made mine, I saw that every version that they listed was out of stock and had been for some time (the last update on their website was several years ago). Anyway, where is the pleasure of just buying something that you can make yourself?
Andrew, I will have to look up a Peltier element.
edward:
I think I prefer yours!
bp:
 On a similar, but different note.
A friend of mine used to machine high grade Titanium and he used coconut oil as a tapping fluid, and sometimes a cutting oil.  Even up here in 'straya coconut oil is usually solid at room temperature.  So he got a cup warmer from his local kitchen supply shop, and robbed a small Pyrex dish from the kitchen.  A dollop of coconut oil in the dish, dish on the warmer and bingo,  the coconut oil stays nice and liquid!!
cheers
Bill
NormanV:
It's easy to get the oil in a liquid state. So far at room temperature my butter is at a spreadable state. I will have to adjust it as summer approaches.
S. Heslop:
I've been having a go at sculpting with plasticine lately and the stuff is hard to work with when it's cool. I've been sticking the plastic wrapped bricks on the radiator before opening them but the thought is how i'm going to handle it when it's not conveniently wrapped in plastic. I was thinking of lightbulbs in a box which seem a little worrying to be left alone for long.. but a vivarium heater is a much better idea!
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