@Anne_Delong yes I think even if you print 1 - it has to hop from one to the other strand in the duplex. So then hopping from 1 to other strands and doing multiple at a time is likely not that much less efficient. Doing 5 diff colors - for a big batch to have on hand. Doesn't matter really how long it takes. Also made them smaller to be able to make more. Scaling is just a click.