I have worked with every model so far. I would say in general (in my experience) the UM2 prints a bit better than the UMO if you're talking about a stock machine.
There are a few reasons for this:
the UMO only comes with 1 fan on the side. This makes one side print better and the other side is often left hanging. (overhangs, get it? heh) The UM2's have 2 smaller fans on either side which is pretty good cooling all around.
Other notable differences:
The start/stop code is handled on the UM2's firmware and it is much cleaner and smarter. Meaning you can start prints back to back without having to manually do stuff like prime the nozzle and such.
Retraction for whatever reason I can't determine is more reliable and better on the UM2s. Virtually no stringing where stringing occurs on my UMO. Many people complain about bowden printers having bad retraction but this is certainly not the case for the UM2s.
In terms of raw quality of prints. I would rate the following assuming UM2 quality is our baseline @ 100%.
UMO: 92%
UMO+: 93%
UM2: 100%
UM2 EX: 98%
UM2GO: 115%
The UM2GO hands down prints the best out of the box. But with obvious disadvantages of being smaller, and no heated bed. The surface quality can be quite superb and I'm not sure I can get my UM2 to duplicate the surface quality. -probably all due to the smaller frame.
The UMO, while lower in the list I think is capable of reaching the UM2 levels of quality. Printed fan shrouds and other mods along with being well built and tuned should be quite capable of producing pieces of equal or better quality than a stock UM2. Mine doesn't print as well as my UM2 but I've seen one UMO that does.
Even though print quality is very similar, I wouldn't discount the usability aspects of the UM2s. I trust them way more starting prints back to back and leaving them for 10-20 hours compared to a UMO.
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gr5 2,295
I think quality is about the same. It's not called the "1" because it has been updated and the UMO could be said to be a newer design than the UM2.
When the UMO got the heated bed kit it became a much better printer. If you aren't afraid of assembling it then go for it.
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zastin17 0
Thanks I have built many reprap printers to sell and I have made lots of money doing it. I have Seen many videos showing the ultimaker and to be honest is probably the best extruder based printer out there. Beats maker bot easily.
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