@wildbill360 Move the head to the 0,0,0 position (all the way bottom left the furthest away you can get from the extruder) Stick the tube into the hotend heatsink all the way and put the clip on then see how much tube you need for a comfortable fit to the extruder. Add about an inch as it sticks into the extruder and there is the length. If its a little too long its ok. Too short OTOH is bad as you always can cut a little off but you cant add. The If its a little longer than necessary it should not hurt In general you want it as short as reasonably possible