Prusa Mini Mosquito Fan Shroud

UPDATE 07/29/2020: RevB is posted. Please note RevB parts are incompatible with the original ones.
Carriage Updates: Reworked profile to not interfere with the smooth z-rod.
Duct: Optimized airflow, better angled the side outlets to hit below the nozzle, it was too low previously.

UPDATE 07/28/2020: Please use the low profile heatbed cover here https://www.prusaprinters.org/prints/37499-prusa-mini-low-profile-heatbed-cover

This is a remix of the fan duct by RH_Dreambox over here: https://www.thingiverse.com/thing:4217188. Shoutout to RH_Dreambox for providing drawings for the positioning of the shroud and answering my questions.

This is a part fan cooling upgrade designed for my Prusa Mini Mosquito Mount here: https://www.prusaprinters.org/prints/36643-prusa-mini-mosquito-mount

There are two pieces to the system:

• An Updated X-Carriage which contains a receptacle for a fan shroud
• A fan shroud based on the RH_Dreambox design that slots into place.

If there are remixes, please try and keep the x-carriage design the same so we can swap out shrouds easily 🙂. Along those lines, I am working on tweaking the fan duct geometry and will post updates.

Additional Items needed:
1x M3-8mm (you can also use the spare M3-12mm screw that came with the Prusa Mini)
1x M3 nut

Installation Instructions:

1. Follow the heatsink/mount disassembly instructions here https://www.help.prusa3d.com/en/guide/how-to-change-a-heatsink-mini_121780
2. Follow the instructions to loosen the x-belt tension towards the bottom of the article: https://www.help.prusa3d.com/en/article/ghosting_1801
3. Slide out the belts from the assembly
4. Slide the linear bearings outs, they will slide out along the x-axis linear rods and may take a little bit of coaxing to pop out
5. Remove the original x-carriage part
6. Invert steps with the new x-carriage (you can also slide the linear bearings into the new carriage.

Cooling Configuration:
PLA: You should see improvements out of the box since the fan will be at 100% and distributing the air evenly.
PETG: I've noticed since the percentage is so low, the increased resistance the shroud adds to the airflow is noticeable. Because of this, increase the cooling by 10% (default: 30-50, my profile: 40-60) to compensate for the increased resistance.
ASA: Doesn't require as much cooling as PETG so should also work out of the box.

NOTE:
There is a tight clearance between the back two screws that are used to line up the bedsheet and the heatbed cover which will impact mesh bed levelling as well as build area. Please use the linked low profile heatbed cover and verify the shroud clears the two screws and heatbed cover on the back of the heatbed.

Print instructions

X-Carriage:
Print in PETG @ 0.2mm 20% Infill. Follow the orientation in the provided 3MF (X-Carriage long side along the x-axis, minda probe mount facing the back for optimal overhangs)

Fan Shroud:
Print in ASA @ 0.2mm 15% Infill. PETG should be fine but recommend ASA for heat resistance, especially if you are printing higher temperature filaments (not PLA).