Summary

I made a print cooling fan set up for the Duet Smart Effector with a Volcano hot end. it uses a 50mm radial fan, the ring part just a press fit into the fan opening, so a small amount of sanding should be needed for a nice snug fit without splitting the fan case open. Sand a little and test, wash rinse repeat. I use a little electrical tape for added insurance. I would appreciate any feed back for fitment of the ring to hot end as I worked through several versions before this one. Good insulation on the hotend is a must. I use the silicone boot, and kept the 30mm fan on the blue clip for the cooling fins. #3 is slightly shorter than #2 and I would start with that one. as #2 is slightly closer on one side to the hotend. YMMV

added an open ring cooler 10/19 532pm

update 11/11/18: added a cooler that has an end that resembles the one from Prusa for those that like it.