It's a design for stock cooling fan, you will need it if you tune to E3D Volcano or V6.
The thickness of Flow Tube wall is 0.7mm, don't sqeeze it, and pls remove the complete printing by the bottome.
Don't ry this if you only use stock hotend, it requires to remove the stock fan cover and the screw holes.
No internal support is needed for print, fill in 100%, only need manual penetration if you find the two .5 screw holes are sealed, also trimming to adjust the outtake length fitting the distance from hotend.(about 5-DEGREES for outtake height adjustment)
Take some washers if you find the rack interfered by roller screws.
Or you can choose Rack2 the thicker one for settle without washers.
Any comment pls let me know,
Hope you enjoy it!
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