Using a fan to print aggressively acute angles.
by MaikaiGuy, published
This is a simple fan guard so I won't harm my fingers while holding a small fan.
Why am I holding a small fan you ask?
I've been working on something and needed to print overhangs with aggressively acute angles without using supports. I noticed I can get angles down to about 15 degrees and still have a quality print if I blew on the hot ABS as it is printing. So I ran down to Radio Shack and bought a small fan.
The picture is of 5x5x10mm cube with a 1x1x10mm arm coming off at a 15 degree angle to horizontal. The cube and arm on the left have no air flow. The cube and arm on the right do.
Please keep in mind this is a layer height of .27mm and a feed rate of 80mm/s. The slices at this layer height do not have much to grab onto. It's kind of a torture test for the problem I'm trying to solve.
This is a simple fan guard to save my fingers. The real purpose of this Thingiverse Thing is to share a technique for achieving aggressive overhangs and still have a quality print.
I looked at some of the fan ducts for extruder fans, but they all seemed to reduce the build area... unacceptable.
Getting great prints with aggressive angles is easy using a fan with a separate power supply (wall wart), but requires your attention. Since my Makerbot is still relatively new to me and I'm usually watching it print, this is not a problem. ;-)
While I was at Radio Shack, I also bought a wall wart to power the fan and a female plug for the fan wires to accept the wall wart's plug.
You'll need a soldering iron.