I use a Sigma R16 IDEX printer, which has a silicone rubber nozzle scraper, but when printing in two colors, there's still some "dribble" to address. For that, I use what Simplify3D calls an ooze shield. The parameters are adjustable, but I'll use two nozzle widths, one for each color. Not much waste, especially compared to the purge tower, which is not warranted for an IDEX machine. I've printed 0.10 layer height, but would not attempt 0.005 with my current 0.4 mm nozzle diameter. If BCN3D wasn't so expensive for nozzle changes, it would be worth a try to use a smaller set.