Prusa MK2.5/MK3 Fan Cover, SnapOn

by Area51 Jan 8, 2018
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Design updated for MK2.5, R3 parts and a version with grill is added.

Hi, I'm also voting for a mesh on this, (perhaps just with big holes) Had some strings from the filament while printing, that foundt there way up to the fan, and got it stuck. so this would be an awesome addition to this.

Best regards Lars

Thank you for the feedback!

From an engineering point of view, a grill is bad for airflow and good for preventing filament-strings from entering the fan.
I will make a version with a sparse grill and a version for the MK2.5 (been in my pipeline for a while...).

Stay tuned... when testing is done, the models will be uploaded...

Sounds good :-) looking forward to this ;-)

My Prusa was shipped a full black Noctua fan, so I guess from now on they will all be black

Great work!!! Thank you!

Mesh on it would have been spot on

A mesh would look nice, but interfere with air flow and raise the noise level of the fan.
That is why there is no mesh. Should the fan get blocked and stop working, the MK3 firmware will detect it and stop the print before it is too late.

I would suggest to use this one, since it both covers the fan and improves printing:

Prusa i3 MK2/MK3 External Ventilator Cover
by jgeyer

You suggest using your own design as an alternative, why else place a link in the comments for my fan cover.
Your design is heavier, has air obstruction, needs support for printing and only covers the fan sides partly... well...

I am sorry, I didn’t want to go into details, but I really don’t like your design at all. Your design is only cosmetic and even as hiding the fan color it doesn’t work very well.

Also, the cover even makes the fan a bit louder as the air hits the edge of inside diameter. Furthermore it makes the whirling air problem under the fan worse, because small amount of the air gets “trapped” under the edge as the fan spins, because the opening is a bit smaller than the fan diameter.

If you want to hide the fan completely (I have my cover opened from bottom because I don’t care this much about the fan color), I would suggest to add some cross section “ribs” like this (https://www.thingiverse.com/thing:2742479), but there is very little space for this. Otherwise you can move the fan completely like this (https://www.thingiverse.com/thing:2076234) and than add some cover, but I am not a big fan of this approach.

That’s why I made my design as simple as possible, but I didn’t find a way to make the design functional, "snap on" and printable without support (maybe split into 2 parts).

Otherwise I like you other ideas on how to improve the Prusa i3 MK3, but more testing and less branding which only complicates the print (https://www.thingiverse.com/thing:2748862) would be nice.

Anyway, I am looking forward to see your improvements and other designs.

Tilted Adapter for Noctua UPGRADE Fan + 2x Fan Cover
Prusa MK2.5/MK3 Filament Sensor Cover Upgrade
by Area51

All I want is to change the color of what I see. That makes this perfect for my needs.

IF I wanted to do all the other things you say, then I would print a different cover. All I want is a cover, so this is perfect. What one person finds perfect, another finds lacking. Don't tell me what I do and do not want.

Actually it doesnt affect the noise at all. I still have to stick my ear next to the fan to even hear it. Also it looks good. The only think that i had to do was cut a section out were the end stop was. Other than it looks and works great. Also, why block the airflow to the fan?