Tapir Shroud v4.9 for Ultimaker
by nhfoley, published
This is a redesigned fan shroud for Ultimaker which drastically improves the ability to print overhangs without curling.
The fan mounts to the shroud using #2 x 0.5" plastite screws. The shroud mounts to the ends of the M3 thumb screws using more #2 x 0.5" plastite screws as pinch bolts. Trimming some excess length off of the M3 thumb screws will result in a cleaner path for the air internally, but probably isn't necessary.
There are two versions: an standard Ultimaker version, and a version for Ultimakers equipped with a replacement brass tube from Makergear. Both seem to work great!
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200C, 70mm/s, 0.10 Layer height, 0.9mm walls, 30% infill, no support worked for me. Going slower will make the overhangs easier.
The irony with the design is that it may not be printable without support using the original UM fan duct due to the extreme overhangs...
It is important when installing this that you orient the heater block so it isn't touching the printed duct. It is also important that you keep your thumbscrews tight so that the heater block doesn't rotate over time into the duct.