Designed To Be Flexible The LGX Shortcut Copperhead Hotend includes a reversible heat sink that can be installed on the left or right hand side of the cold block. The heat sink also includes the hole pattern for attaching 40×40 fans. Cooling down the heat break Our tests suggest a 4010 fan is enough to cool down the cold block and the cold zone of the heat break, even with such small contact surface to the heat sink. In case you have an application where additional cooling is required, try using a 4020 fan or 2 LGX heat sinks, one on each side. Main Advantages Gives access to all available materials. Enables to print flexible and soft materials faster. It is small and light. Allows mounting in many different ways. Compatible nozzles. The hot block included in this product is compatible with the RepRap standard of nozzles. B