Heat Sink
This ensures that heat does not travel up the plastic and melt it prematurely before it reaches the nozzle. This phenomenon is called heat creep and it causes jams, especially with PLA. This fan should be running whenever the hot end is warm.
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Due to high demand, occasionally some of our products do go out of stock. We are constantly monitoring our stock levels, and we usually expect to replenish any product line within a couple of weeks. If you have placed a pre-order for an item that is out of stock and it looks like it will take longer than expected to get it to you.