Recommendation on Duet Part Cooling Issue
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Hi
I have a Duet 2 Wi-Fi (1.04c). When I converted over to the Duet, I had to do a lot of crimping and I made some mistakes. Early on in the process, my Fan0 stopped working. I made a post about this (https://forum.duet3d.com/category/7/tuning-and-tweaking) and the best advice was that it was probably due to a blown mosfet, and I could just use fan1.
This was fine - still had fan1 and fan2 and even with dual extruder experiments I was only using 1 parts fan. Well, about a year later the same thing happened with fan1. So, I've been using fan2.
Yesterday, fan 2 stopped working completely. I suspect I put stress on the fan wires due to a lapse in good cable management. Fan wires detached from fan
As of this writing, I'm using an always-on fan for my parts fan. I would love recommendations on any/all the below points as they are not all mutually exclusive:
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In this configuration with my parts fan on full blast all the time, is there any significant downside that would make me want to resolve this sooner rather than later?
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What are the options for repair if any? I saw the replacement MOSFET recommendations at https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers. I could order "type PMV20XNER or AO3400A or AOSS32334C which have a higher peak current rating and are fitted as standard in recent production Duets" . . . but my soldering skills are far too primitive. If I order these is there a good way to get them replaced?
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Should I instead consider moving to a newer board like a Duet 3 Mini 5+? My requirements are not extreme - 24V, max 2 extruders, BLTouch. My motors are all 2 Amp except Z axis motors which are 900 mA. Seems like an expensive option - would quality be going up or down (different drivers, etc.)? Also seems like it would create some work to transition configuration though I am on firmware 3.4.4. I don't have Wi-Fi issues so not lusting after external antennas, etc.
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For parts cooling I've been using "WINSINN 50mm 5015 Blower Fan 24V Dual Ball Bearing, Brushless Cooling 50mmx15mm 2PIN". Is this choice of fan in any way contributing to my issues? Do you have an alternative I should consider? I've tried Noctua and other axial fans but had better luck with blowers and even read an interesting article about the two on reddit (https://www.reddit.com/r/3Dprinting/comments/7kexdv/a_nearly_comprehensive_study_of_cooling_fans_and/).
Apologies for the length but hopefully this will be interesting for some others.
Happy New Year!
Jack -
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There's no downside to running the part fan always-on other than the lack of slicer control.
If you aren't able to solder the replacement mosfets you may be able to find a place locally that has the capacity, or depending on where you live it may be viable to send it off for repair.
The mini5+ is a good option if you were looking to replace the board. Config file differences aren't major. Pin names mostly. The config tool would be a good place to start for a basic setup.
I prefer Sunon blower fans. I like this one. https://www.digikey.ca/en/products/detail/sunon-fans/MF50151VX-B00U-A99/7691033?s=N4IgTCBcDa4KwE4C0BGAHGZA5AIiAugL5A
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@Phaedrux said in Recommendation on Duet Part Cooling Issue:
There's no downside to running the part fan always-on other than the lack of slicer control.
Doesn't whether taht's a major downside or not depend on the material printed?
I prefer Sunon blower fans. I like this one. https://www.digikey.ca/en/products/detail/sunon-fans/MF50151VX-B00U-A99/7691033?s=N4IgTCBcDa4KwE4C0BGAHGZA5AIiAugL5A
I observe that lots of part cooling fans are at wacky angles, and ball bearing fans are generally more tolerant of non-horizontal rotation axis placement than are other bearing types. I agree Sunon are generally good, but they don't seem to have many ball bearing options. I've never seen any data about whether a good quality non-ball fan from Sunon outlasts a generally less-good ball bearing one from someone else, though.
(Ball bearings are also more tolerant of elevated temperatures, if the chamber is heated.)
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@Phaedrux thanks for the pointer on those blowers. I'll give them a try.
Also, I see there were questions about orientation and heat. I designed my own carriage (I'll post a picture tonight) with accessibility in mind. There is a small arm that take the blower off to the side. So it sits in its normal orientation, off to the left of any heat source. So, I should be good on both orientation and heat fronts.
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@achrn On the material, that is a good question. Most of my prints are with PETG and so far that is ok.
But I have a new spool of Parmount TPU which has not fared well in terms of adhesion and I wonder if the fans are part of it. Maybe I'll remove my fan completely and do a TPU test.
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@achrn The nice thing about Sunon is that you get an actual data sheet.
They claim temps up to 50c. I'm not sure about angle of mounting. I would think that the maglev would be superior to ball bearing, but that's just my hunch. They make no recommendation on orientation. I've been running one at a 45 degree angle for a number of years now without issue.
Obviously, having PWM control over the fan would be ideal. Always on wouldn't be advisable for anything but PLA. There's no risk of damage to the fan or board from running it always on though.
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@Phaedrux can't wait to try the Sunon.
Based on what you all have said, I ordered a few Mosfets and there is a little computer repair shop near here that I'm going to talk to.
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Here is the carriage configuration. I think heat and angles shouldn't be a problem.
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@Phaedrux Struggling to find any Sunon 24v blowers in stock :-(. I'll keep looking. But, the blowers at digikey seem like a notch up from what I've been using so, if I can't find a 24v Sunon, I'll probably try one of these:
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If you look at page 11 of 14 in the linked pdf file (@Phaedrux post), item 7 specifically says not to use PWM on either + or ground to control speed.
I recall seeing something a while back about the Sunon fans with mag-lev bearings not working well with variable speed via PWM. These fans have something called "vapo bearings".
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@mrehorstdmd And yet it works perfectly well down to about 15% speed.
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@Phaedrux and @mrehorstdmd this is part of what I love about 3d printing. There is as much devil and as much detail as you could ever want . . .
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@jrwaters2 some sunon fans don't play well with PWM and are either on or off. I believe the feature is "auto restart" and the fan reboots if it's not spinning when it thinks it should. Essentially you need a sunon without a letter A at the end of the model number
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@jay_s_uk that is extremely helpful - thank you! Most 24v Sunon's are out of stock. I did find one from Mellow on Ali Express that claims to be a genuine Sunon and even has information on how to tell a genuine from a fake. Its the same price as from DigiKey but they have in stock
I was going to order from someone like DigiKey or Filastruder or Matter Hackers but that doesn't seem to be an option at the moment.Interestingly, the Mellow one states "Upgrade: New fan support voltage to adjust wind speed"
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@jrwaters2 the mellow ones are ok as far as I'm aware.
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@jay_s_uk thanks - I ordered one today so will see how it goes.
