MINI heat block fan replacement PWM and voltage  

RE: MINI heat block fan replacement PWM and voltage

I had a broken fan on my Prusa i3 MK2.5S and wanted to replace it. Be aware that you by a fan with same rotational speed as the original. With the replacement (the MK2.5S has only 3 pins) I had lots of issues during printing because of "wrong" cooling. I ended up bying an official fan from Prusa.

Best regards, Clemens Mödlin

RE: MINI heat block fan replacement PWM and voltage

@joantabb

Correct, 3 wires, but I was just not sure.

Thanks a bunch!

RE: MINI heat block fan replacement PWM and voltage

@hl2run

As far as I am aware the 4 wire fans, need an active PWM signal to be pumped into the fan, to drive the fan motor controller. which is a feature I have not seen on a 3D printer...   but then I have not got my hands on a Mini yet, so have little idea what the 32 bit controller can achieve. 

regards Joan

RE: MINI heat block fan replacement PWM and voltage

Posted by: @hl2run

Hello,

I am looking into replacing the stock heat block fan on the MINI.

I figured the stock fan is 5V.

 

Which one of these would work?

3-pin 5V
https://www.alza.sk/noctua-nf-a4x10-5v-d5464098.htm?o=33

4-pin PWM 5v
https://www.alza.sk/noctua-nf-a4x10-5v-pwm-d5716009.htm?o=41

Does anyone know which one I should buy?

Thanks!

I would not recommend any of the fans you are showing here. With a quick search you can see that the characteristics are way different. If you wanted it for a pc air flow it may would be sufficient but in the case of a 3D printer it will cause many problems with layers.

Key differences:

• While the rpm on Delta (Mini original) fan is 8000rpm the Noctua has 4500rpm.
• Also the rated input current on the Delta is 0.11A  while on the Noctua is half 0.05A.
• The most important characteristic is the air flow which in the case of Delta is 0.262 cubic meters/min while the Noctua has  0.1366 cubic meters/min which is again half. This means it cannot provide the same air flow to your 3D prints.

RE: MINI heat block fan replacement PWM and voltage

First time uploading pics 😋 

Here are the datasheets from both fans. So I would recommend searching for a fan with the blue characteristics above.

RE: MINI heat block fan replacement PWM and voltage

@geoper2

Thanks so much! The Delta fan is really noisy, so I will look for other suitable replacement.

RE: MINI heat block fan replacement PWM and voltage

@hl2run

Have you managed to find suitable fan? 

RE: MINI heat block fan replacement PWM and voltage

@crawlerin

Nope :(, crawled whole aliexpress with no luck.

RE: MINI heat block fan replacement PWM and voltage

Posted by: @hl2run

@crawlerin

Nope :(, crawled whole aliexpress with no luck.

Do you think this one would work? Specs are close bit a bit more CFM and power.

https://www.digikey.com/product-detail/en/cui-devices/CFM-4010-03-20/102-4398-ND/6194962?utm_adgroup=DC%20Fans&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Fans%2C%20Thermal%20Management_NEW&utm_term=&utm_content=DC%20Fans&gclid=CjwKCAjwr7X4BRA4EiwAUXjbt7z9szkQ0NFe9mXGkj7720Vk6i3VbSVI24yc2xdK9bG8p4Gd1Icb7RoCDuwQAvD_BwE

RE: MINI heat block fan replacement PWM and voltage

Any updates on finding a quiet replacement fan? Bit of a shame noctua ones wont work

RE: MINI heat block fan replacement PWM and voltage

@tobz4321

nope

RE: MINI heat block fan replacement PWM and voltage

I have these on both my MK3S and Mini: FTSETC Fans.  I also have a Noctua 3 pin 5V on a printer.  The Noctua is quieter and appears to cool sufficiently.