Bowden Cooling Tube for Rostock Max w/ Squirrel Cage Blower

thingiverse

Squirrel cage blowers can move a LOT of air, which is great for cooling printed parts, but since they're bulky, it's not ideal to have them attached to your 3d printer's end effector. This set of parts lets you mount a squirrel cage blower (one with a round nozzle) in a convenient spot, and then pipe the air to the hotend via 3/8" vinyl tubing. You'll need to print 4 of the clamp ring part, as it takes a pair to make a ring, and use some M3x8 screws to join them. You'll also need some longer M3 screws + nylock nuts to mount the rings to the end effector, or just one long M3x25. I secured the vinyl tubing using some 2 part epoxy, and helped it bond by roughing up the tubing with a little sandpaper first. You can also use black corrugated tubing, which is more flexible, but it tends to make an annoying whistling sound as you crank up the fan speed. The nozzle needs to be printed hollow, and the cap just goes on the end of the tube by the hotend, with a small window cut in the tube right where the gap is in the cap. This lets you direct the airflow exactly where you want it, which is generally in the shape of a cone just at the tip of your hotend nozzle. Please note that the picture is a little out of date, and uses the older mounting rings instead of the new clamp rings. Each new ring is made by screwing together two of the Clamp Ring parts, and flipping one upside down on top of the other, such that the screw holes line up.