I cannot speak about the TAZ, but I have 3 Ultimaker printer, Um2Go, UM3 and S5 and can say they are all very reliable. Also the switch is very durable, no problems at all and I also haven't heard any problems from others. So don't worry, this lifting mechanism just works. Of course it is a bit time consuming, but with a dual print you want a good and clean result and if you enable a prime tower too for example to wipe you nozzle, then the switching time is negligible. I would not buy a printer which doesn't lift the unused nozzle, to avoid scratches or other accidents during the print.
You write "the price of the matching filament". You only need a 2.85mm filament and you can use any brand you want. There is no need to go with UM filemant. The advantage with UM filament is only, that they have an NFC tag and will be auto detected by the printer. But if you load a non UM spool, you select the material type on the display and then you have the same result. Nothing more happens and no more magic with UM spools. But you should use a filament of good quality, but that should be the case for all printers.
Bondtech feeders are only needed for the UM3 if you want to print abrasive materials, because the UM3 feeder gears are not hardened. The S5 feeder gears are already hardened so you can print abrasive materials with the S5 out of the box. Both feeders are great and personally I don't see any advantage to the Bondtech (except for abrasive materials) Additionally the S5 feeders have a filament sensor detection. Bondtech feeder are great for UM2s or UM2+, I have one on my UM2Go and there was a great upgrade, but the UM2 feeders are not as good as the stock UM3 or S5.
Im interested in this as well. I was looking at the Taz but the ultimakers do seem like a more polished product.
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