These parts are used to mount the copper cooling roller above the fan on the laser cut enclosure. I also added another support for the filament on the front.Print the tube, bushing holder A and B (left and right sides). Insert the two halves into the brass tube. The ends of the support bar have two small holes in them that you can use a small pin or drill larger and use a piece of 1.77mm filament. Put the copper roller assembly on the tube then use two 5mm screws to secure the tube using the holes in the from of the filastruder enclosure near the fan.