Extruder fan specification ?  

Re: Extruder fan specification ?

I have no experience in fan durability :/

Do you know if ADDA is reliable ? They make another interesting fan regarding the specs: ADDA AD0412LB-C73GP(P) (6.4 CFM, 19 dB, 0.15inch H2O) and pretty cheap, can be found at 5 €

(Edit: Well 5€ if you order 500, otherwise close to 20 € ...)

I just know to avoid Sunon from when I was repairing Xerox machines. They had a recall on Sunon branded fans that they installed across several different models of copiers. ADDA sounds reliable enough and may have been one of the brands that we replaced the Sunon's for.

Re: Extruder fan specification ?

Ive had a design in the print queue for a week now, printed it now, with some eSun eAL-fill.
Anyone know how to polish this without a tumbler?

Re: Extruder fan specification ?

Ive had a design in the print queue for a week now, printed it now, with some eSun eAL-fill.
Anyone know how to polish this without a tumbler?

Looks great!!

Sandpaper would be your best, albeit most annoying, bet.

Re: Extruder fan specification ?

Do you have a dremel ? It would really help you here.

Another option, using a kind of coating like XTC-3D, with mild sanding for finishing.

Re: Extruder fan specification ?

I honestly think that if you are going to do any finishing to this item that you polish the wind tunnel for better air flow.

Re: Extruder fan specification ?

Rub adub dub with a low grit abrasive. And whilst you are doing it think of love 😉

Re: Extruder fan specification ?

I honestly think that if you are going to do any finishing to this item that you polish the wind tunnel for better air flow.

The airflow wont improve a considerable amount no matter how much I polish the inside or cover up the heads of the screws.
The disturbance in the airflow will be to small to affect the cooling overall. The drop in cooling time that we see has t do with the fan, not our angled design or unpolished wind tunnels.

Re: Extruder fan specification ?

Rub adub dub with a low grit abrasive. And whilst you are doing it think of love 😉

Done some rubbing with sanding paper, steel wool and the backside of a spoon.
I would say that the spoon created the best effect so far, it wasn't done with love in mind though, so I quit after 5 min 🙂
I have some eCopper as well, will do another test with that and do some more love-rubbing.

Re: Extruder fan specification ?

I think I might have some issues with cooling of the hotend now! I'll do some more investigation before turning back for the original fan to see if it disappears.

Re: Extruder fan specification ?

Any details?

Re: Extruder fan specification ?

Any details?

I am confident that once he figures out more he will post them here. 🙂

Re: Extruder fan specification ?

Any details?

It's been going back and forth, but I also saw that some of my S3D settings was screwed up, after adjusting them again it seems to print fine again, so it was hopefully the printer trying to tease me! 🙂

I suddenly got some REALLY wierd looking things popping out where my start/stop points was located.

But the retraction (and many other) settings was crazy in S3D suddenly, so I think it was some kind of hickup in the profile-files there...

Seems to print fine again now!

Re: Extruder fan specification ?

Re: Extruder fan specification ?

auuhhhm.... I just started to look what fan I ordered... This is the one: https://www.komplett.se/product/770799/datorutrustning/kylningvattenkylning/flakt/noctua-nf-a4x10-flx-40mm-flakt#productinfo

Thats clearly a 12V fan, do we get 12V or 5V from the rambo? I forgot and got very insecure suddenly...

This is the 5V one: http://noctua.at/en/nf-a4x10-5v/specification

Am I using the wrong fan?

Re: Extruder fan specification ?

Thats clearly a 12V fan, we're using the 5V output right? So Im running my fan half speed?
No, fan output is 12V, original fan is 12V as well.

Re: Extruder fan specification ?

Thats clearly a 12V fan, we're using the 5V output right? So Im running my fan half speed?
No, fan output is 12V, original fan is 12V as well.

Re: Extruder fan specification ?

The poor performance of the Noctua fan for this application is almost certainly related to the much lower static pressure rating of the fan. With the huge heatsink of the cold end blocking the path of the air flow, the fan blades simply cannot push enough air through it.

A potential solution would be to drive the fan with a slightly higher voltage. Rather than use a boost converter to go from 12V to 13V, I think it would be easier to order the 5V part, and use a resistor to bring the 12V down to 5.5V or 6V. We will be running the fan slightly beyond the factory spec, but hopefully it will be within the margin of error.

Re: Extruder fan specification ?

The poor performance of the Noctua fan for this application is almost certainly related to the much lower static pressure rating of the fan. With the huge heatsink of the cold end blocking the path of the air flow, the fan blades simply cannot push enough air through it.

A potential solution would be to drive the fan with a slightly higher voltage. Rather than use a boost converter to go from 12V to 13V, I think it would be easier to order the 5V part, and use a resistor to bring the 12V down to 5.5V or 6V. We will be running the fan slightly beyond the factory spec, but hopefully it will be within the margin of error.

I have the 5V version on the way as well, I might to some test with "overclocking" that one

Re: Extruder fan specification ?

The poor performance of the Noctua fan for this application is almost certainly related to the much lower static pressure rating of the fan. With the huge heatsink of the cold end blocking the path of the air flow, the fan blades simply cannot push enough air through it.

A potential solution would be to drive the fan with a slightly higher voltage. Rather than use a boost converter to go from 12V to 13V, I think it would be easier to order the 5V part, and use a resistor to bring the 12V down to 5.5V or 6V. We will be running the fan slightly beyond the factory spec, but hopefully it will be within the margin of error.

I have the 5V version on the way as well, I might to some test with "overclocking" that one

Excellent!

You are probably already familiar with such things, but in the small chance that you are not, choose your resistor values carefully. What you'll first need to do is measure the actual power draw of the fan (the spec sheet is way off on this, they always over-estimate) then calculate a resistor value to bring it from 12V to 5V, 5.5V, and maybe 5.75V. Maybe start at 5V as a baseline test and slowly change values until performance is similar to original fan.

Re: Extruder fan specification ?

Just a notice. Brushless fans contain electronics to make it turn. It will most likely die when too high voltage is applied. Be careful when using 5V fan on higher voltage.