Just curious... Was there a reason you didn't seam and sand as parts came off printers, and instead waiting until you had them all? Like contain the mess and clean up to one long day?
For me... as an old guy with way too much bodily damage, sanding as they come off so I only do a part a day basically, means less tennis elbow. Doing an hour or two per session instead of 12 hour days of sanding is just a lot easier on my old tired bones.