No difference printwise, but it pauses for a few seconds whenever a splice is made. I suppose it would make a difference with hundreds of splices, but I try to limit the number of splices to less than 100. It has to build the transition tower though, and that’s what really kills it. 40% more time on the average building that useless block of plastic, but I’ve had cases where it was more like 600%! My best uses for it so far are custom colored PEZ heads, drink coasters and colorful name tags. Attempts to do things bigger than that are very time consuming and risky. I’ve done a few colored models I found on Thingiverse, but usually I have to scale them down, sometimes way down, like half the size to get them to fit along with the transition tower. BTW: If you are willing to babysit your print and clean up the stringy mess after each layer, you can get by without a transition tower by using side transitions. It still has to purge the extra plastic, but it dumps the plastic to the side instead of building a transition tower. Unfortunately, unmodified the R2 doesn't support moving the hotend beyond the confines of the bed. I was thinking of an invention: a metal strip about an inch wide that you can attach to the right side of your bed to route material over the side and away from the bed. You would still have to babysit the first few layers, but losing about half an inch of the right side of your bed is better than losing half of your entire bed.