Fan duct for part cooling for Ender-4 with interchangeable nozzles.
Including a more effective fan duct for hot end cooling, which also is base for part cooling fan duct.
Designed without sharp edges and bends, to minimize noise.
Hot End Fan Duct:
Version 2: (Updated 01-27-2019)
Improved mounting method, that is more stable and will work with PLA.
It have quite a snug fit over the hot end, and may not fit when printed on your printer. Leave a comment, and I'll create a version with a looser fitting.
To be able to print without support, I've added 4 pcs. 0.2 mm bridges. These must be cut away according to picture.
Follow instructions from version 1, for mounting.
Mount the 40x40x10 fan, that came with your printer, to the fan duct with 4 pcs. 3mm nuts and 4 pcs. 3mm screws (14-18mm long).
First put the fan duct over the top of the hot end, and then gently push it to place in the bottom. You might want to cut away 6mm of the bridge on top, so you easily can slide it over the PTFE tube. Both ways will work.
Part Fan Duct:
Here you have two choices. Either print ‘Part_Fan_Duct_Assambled .stl’, which some may find hard to print without support, or print ‘Part_Fan_Duct.stl’ and ‘Fan_Mount.stl’ and glue those together.
Mount a 5015 Blower Fan, and slide the fan duct on the Hot End Fan Duct. I used 2 pcs 4mm x 25mm screws and two 4mm nuts.
Wiring (For Ender-4 only):
If your 5015 Blower Fan is 24V, use the 'Fan1' connector. (The LED-strip connector).
If you have a 12V Blower Fan, you should be able to use the upper 12V connector. I have NOT tested this….. The mentioned connectors are marked on the controllerboard picture.
You may have to extend the wires on the Blower Fan.
BEWARE!!!! The polarity of the fan connectors, seams to be swapped on the Ender-4 controllerboard.
If the nozzles sits a bit loose, simply heat up the mounting bracket on the nozzle, and give it a gentle bend.
Normal fan nozzle, that blows down on the part from two sides.
Comes in four versions. 5, 10, 15 and 20 degree drop on nozzel tip.
Fan nozzle that blows slightly down on the part from four tubes.
Circular fan nozzle.
Fan nozzle that blows past the nozzle, so less airflow should bounce back from the build plate. (Can be helpful if you don’t have a silicone sock on the heating block).
All parts can be printed without support, in the orientation of the STL files.
I've printed mine in PETG, but I would guess PLA is just fine for the ducts. I dont know if PLA would work for the nozzles though.