You should make up your mind about what's your primary focus with the printer. Do you want to tweak the machine, try experimental setups? Then go for the UMO+. If your aim is to produce a lot of nice prints with different materials then choose the UM2+.
3d printers are not plug and play like 2d printers. It takes some practice and knowledge to get beautiful prints on both the UM2 and UMO. The UMO can produce just as good quality in my opinion although one problem the UMO tends to have over the UM2 is loose belts. But there are many great solutions to tighten the UMO belts a little bit. The UMO assembly may frustrate you. Anyone can do it but you need to pace yourself and stay motivated. Afterwards you will be much better off.
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