Rostock Mini Fan Duct
Description
I suggest you try setting your cooling to 25% for extruder cooling (at 100% my extruder couldn't maintain 185 C!). It can cool a print job if you run it at 100%. See a video of me printing my C9 bulb cooling required test part here:
youtube.com/watch?v=xRc3xJxuWMM
Instructions
Use four M3 screws (I used 16mm length) to mount it to the platform (from the bottom) via the four extra holes. Use four M2.5 screws (I used 16mm length) to mount a 40mm fan to the top.
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Hope that fan doesn't blow too much air onto the build surface!! The original Makerbot Replicator suffered a problem which the extruder fans would blow air onto the print, causing major warping issues, until a piece of Kapton tape is placed under the fans to prevent air from blowing directly onto the prints. Seriously, when I first got the replicator, 85% of all prints failed because of warping, by eliminating the air flow issue. Now I have only about a 5% failure rate due to warping.
Funny, over at http://www.thingiverse.com/thi...
proprentnerl and I were discussing if a fan duct such as this would allow ENOUGH air to get down to the part (to cool plastic on one layer before the next layer comes out...) If you are using Slic3r you can have it dynamically adjust the fan speed based upon the layer size (or disable it entirely for the first N layers...etc). My main goal is to cool the top of my MakerGear extruder to prevent extruder jams, but I would like the ability to cool the plastic of the part by turning up my fan speed to allow me to print thin/small parts without them getting all floppy (such as my C9 bulb...which is my "go to" test for part cooling ability....http://www.thingiverse.com/thing:4207...
I haven't had enough time to fully test this fan duct over multiple prints yet, but I'll report back when I know enough to say It's good, or if I decide to remove it.
License
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What extruder are you using since the "official" mini one was never documented.
I'm using a MakerGear "V3 GrooveMount". Brian's printed hot-end mount fit the top perfectly, so It's probably very similar to what he is using, or at least uses the same top circle size. Instead of laser cutting a piece of plywood to hold it, I bought a "wooden mounting piece" for "Wades" extruder, traced around it with a pencil, and cut the extra pieces of with a bandsaw. I also had to drill out two holes to match the platform.