3inch hose attachment
thingiverse
This attachment connects a 80mm computer fan to a 3" hose, fitting MakerBot M3 hex-head machine screws for assembly. Print with a raft to prevent curling and attach it to the fan (or other hoseless item) using screws. Secure a flex-hose in place with a clamp or zip-tie for venting purposes. Note: large prints may require G-code adjustments on Thing-O-Matic build platforms, so check with ProcessingGCodeViewer (http://www.thingiverse.com/thing:14980). For more details, visit http://zoomy.net/2012/01/30/thing-003-fan-attachment/.
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