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even though i think that the psu of the 3d printer might get you over the switching time offline usv’s have, i’d go with an online usv (voltage & freqency independent)
one missed step and your print might be gone.
depending on your outages you might go for a smaller battery, because you’ll have to replace them more often with an online usv.
mine neither.
that’s why i wrote usv, it’s the german equivalent.
i meant online ups.