This is what we call the "Time is Money" tower.  There is a constant desire to have the best possible surface finish with prints, but it comes at the price of time. We're created a sample that shows this concept very plainly. Each one inch section of the tower is done at a different layer thickness. 

.1mm layer = 360 RMS = 102 minutes

.2mm layer = 590 RMS = 51 minutes

.3mm layer = 720 RMS =  35 minutes

.4mm layer = 950 RMS = 26 minutes

.5mm layer = 1100 RMS = 21 minutes