Finally got the twin Saturn 16k Ultras set up and decked out

Running a two-printer setup myself for about a year now, one on standard and one on ABS-like, and the calibration peace of mind is real. Once each machine stays with its own resin, my exposure settings basically never drift and I stopped keeping spreadsheets of test plates. The swap-tax thing you described is exactly why I stopped sharing one printer between duties, even when I only had the one and thought I could just change vats on weekends. I was burning more time cleaning and recalibrating than printing. For ventilation, I ended up building a plywood enclosure that sits over both machines with a single extraction point at the top. A cheap inline duct fan rated around 100 cfm pulls thru flexible hose to a window vent panel, and I run it for a good while after prints finish too. Before that I tried just cracking a window and it did almost nothing in winter.

Space was my other headache. I moved the wash and cure stations to a seprate shelf unit next to the printer bench instead of sharing the same surface, which freed up enough room to actually lay parts out and post-process without leaning over an open vat. Cheap plastic trays for curing parts, labeled per machine, keeps the two resin types from cross contaminating when I've got batches going at the same time.

My two-printer setup went in almost the opposite direction in terms of what each one does, though I run an older pair of Mars machines so take that for what it is. Both of mine stay loaded with the same water-washable grey pretty much year round, because what I acutally needed was throughput for batch jobs rather than specialization. When a friend ordered two dozen orcs I just queued the same file on both and had the whole batch done in one evening instead of two days. I do keep one spare vat for when I want to run a flexible or clear resin, but that happens maybe twice a year, so swapping the vat out and re-leveling is not the chore it would be weekly. The second printer paid for itself in saved cleanup time alone. The space issue is the part I'd flag from expirience. I started with mine on one metal rack in a spare room and ended up moving the wash station to the garage entirely, since the dirty alcohol container was the thing taking up real estate, not the printers. Getting the curing station off the main table freed up more room than I expected. Also worth thinking about where your resin bottles live, because those stack up fast once you have a couple of partial gallons going at once.

The Mass Effect naming is a nice touch. Mine are just 'the good one' and 'the temperamental one', which is honestly more descriptive.

The vinyl thing checks out from my end too. I tried plain sticker paper on my printer hoods a couple years back and it peeled and went gummy near the warm spots. Switched to low-tack vinyl and two years on it still looks fresh, and it came off clean when I sold one of the machines. Does the adhesive hold up near the pour area where IPA drips tend to land? That's where mine started lifting before I moved the decals up higher on the hood.