A CNC Router is typically designed for softer materials such as wood, acrylic, and some stone substrates. The CNC Router is generally more portable and does not provide bit cooling.
A CNC Mill is a more industrial machine, most often used for shaping metals - as such, there is typically a liquid coolant to prevent the bit from overheating. This coolant system, combined with the large size of most milling machines, makes it prohibitive for the average home user.
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