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Anyway. This one has a weird feature compared to my other two. The main fan only activates when the extruder hits 50 degrees C. I know about this feature from Marlin of course, I just thought the UM2 wasn't able to use it.
This depends only on the revision of the main board. On the older boards (Rev. 2.1.1) the 5 Volt supply for the small fan is hard wired and not switchable. This has changed for newer boards, that are used for the UM2+ (Rev. 2.1.4).
A cheaper option for older machines would be a bimetallic temperature switch and a bit of tinkering, see here:
So if you go back even older, the first few thousand UM2s had a very very quiet 3rd fan. You really can't hear it. And it works just fine. So consider just buying 2 for your older UM2s:
I see. My newest one is probably a later batch then. I was hoping I had just missed something.
My other two are fairly quiet. My very first one was very loud but I didn't notice until I got my second one and realised how quiet it should be. I think the second one was pretty early because it had the very low light encased led strips. Anyway, I ordered a new fan for the loud printer and they are all just fine. Would have been even more quiet with it off though.
I might get one of those switches and mount on the side I guess. It won't fit on the top because I use Alexander Leisentritts modified print head. It's not a really big deal, just very nice that the fan shuts off when not in use.
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tinkergnome 929
This depends only on the revision of the main board. On the older boards (Rev. 2.1.1) the 5 Volt supply for the small fan is hard wired and not switchable. This has changed for newer boards, that are used for the UM2+ (Rev. 2.1.4).
A cheaper option for older machines would be a bimetallic temperature switch and a bit of tinkering, see here:
UM2-RearFan-Automatic
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gr5 2,330
So if you go back even older, the first few thousand UM2s had a very very quiet 3rd fan. You really can't hear it. And it works just fine. So consider just buying 2 for your older UM2s:
http://www.digikey.com/product-detail/en/MC25060V2-000U-A99/259-1573-ND/2757803
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jonatanrullman 17
I see. My newest one is probably a later batch then. I was hoping I had just missed something.
My other two are fairly quiet. My very first one was very loud but I didn't notice until I got my second one and realised how quiet it should be. I think the second one was pretty early because it had the very low light encased led strips. Anyway, I ordered a new fan for the loud printer and they are all just fine. Would have been even more quiet with it off though.
I might get one of those switches and mount on the side I guess. It won't fit on the top because I use Alexander Leisentritts modified print head. It's not a really big deal, just very nice that the fan shuts off when not in use.
Cheers
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