Hemera 5015 Fan Shroud - Simple

----Overview----
This is a simple fan shroud for use with a 5015 blower. It bolts directly to the lower two mounting points on the Hemera motor. It was loosely inspired by the MK3S fan shroud, with the fan tilted away from vertical (30deg here) and two flanking ducts blowing from the sides towards the back of the nozzle.

Any tips on improving the performance of the shroud would be greatly appreciated! I've included a .step file for the tweakers out there.

Print in PETG, ASA, etc. PLA will warp. Support the mounting arm, obviously. Lower layer heights (0.1-0.15ish) will produce cleaner ceilings inside the duct, might be a good idea.

Mounting Hardware:

• 2 × M3x5 socket head bolts - into supplied square nuts
• 1 × M3x20 socket head bolt - threads into plastic
• 1 × M3 washer

---- Hotfix v0.3.1 ----
09/03/2021 11:32

User svdb99 pointed out several problems with the STL mesh. Non-flat bottom surface was among them, and this has been fixed here.

A complete v1 remodel to fix wall thickness issues (and printability in general), improve air flow, and general model funkiness is in the works. No idea when this will be released though, hopefully v0.3(.1) is doing the trick for most of you in the meantime!

---- Update v0.3 - Untested ----
26/02/2020 21:09
Changes from V0.2

• By popular demand: 6 mm of negative vertical adjustment!
• Shaved a bit more material off of the bottom, might improve nozzle visibility
• Airflow directed further downward through main opening
• Thin wall problems at the flanking ducts should be fixed

---- Update v0.2 - Benchmarked ----
11/12/2019
Result
Bridged as before. 60deg front, and sides. 50deg rear. An improvement on v0.1.
Changes from v0.1
The direct duct blew too far below the nozzle, cooling the print body too much and causing corner curling.

• Angled the main duct more toward the horizontal
• Focused the main duct air flow along the bottom of the nozzle, less on the block
• Restricted main duct cross section, hopefully increases side cooling

---- Update v0.1 - Benchmarked ----
09/12/2019
Result
Bridged almost perfectly. 50deg in all directions. Not amazing, but consistent on all sides. Will improve.
Changes from v0.0
Noticed most airflow was behind the nozzle and the straight duct was mostly obstructed by the silicone sock.

• Shortened the wings about 5 mm
• Moved the direct orifice back and sloped it downward slightly

Testing Methodology
Print TeachingTech's fan torture test - https://www.thingiverse.com/thing:3167063
Consider last angle increment that looks like the previous to be the max angle.

Conditions:

• AmazonBasics White PLA (original supplier)
• 205degC nozzle
• 0.2 mm layer height
• 60 mm/s inner perimeters, 30 mm/s outer
• 2 perimeters
• 0.4 mm extrusion width

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