3D printing resolution / accuracy

I'm printing some items that require down to 1/10 mm accuracy, pushing the limits a bit and curious what others are doing to improve the accuracy of their prints.

I see the printer Bambu PS2 says in the print settings it will do 0.08mm (fine) print, which I've selected for my prints. I believe the extruder nozzle is a 0.4mm currently in the machine (also correctly spec'd in the print settings). I'm printing with a ABS filament.

Question 1: Bit odd that Bambu Studio claims it can print at 0.08mm when nozzle is spec'd at 0.4mm? Not exactly sure how that works, is that the filament size and not the extruder tip size?

Question 2: How are you handling high precision print requirements? I'm currently printing with some extra padding in certain areas then removing material via another process to adjust fitment. Not ideal, I'd just like to print if possible without employing a secondary process.

Question 3: Repeatability, when the parts are smaller I'm noticing the dimensions vary a bit. I'm using ABS material, maybe a different filament would hold dimension better through cooling process? It needs to be a filament for automotive application. Any suggestions, filament or otherwise?

Question 4: I imagine the material "shrinks" a bit when it dries & cools off? Any idea if the printer model accounts for a temperature / expansion coefficient of the filament?

Thanks!

Question 1: Nozzle diameter at 0.4mm and layer height at 0.08mm are 2 different things. As the filiment is laid down the nozzle will only step up 0.08mm, so that'll be the height. The printer will control the flow through the nozzle to make sure the width and height of the layer lines are suitable.

Question 2: Printing holes too small on purpose or not printing them at all and drilling them out in a mill is an option. But i'd say most of this comes down to the orientation of the print. Basically align the important details like the hole position etc with the print bed, don't let gravity have an impact on important dimensions

Question 3: Not sure here, depends what properties you need but ABS is know to be a bit trickier to print. Maybe try slowing the printing speed as well. Nylon/PA is a good one.

Question 4: It would, but i'm not sure - I'd imagine a printer like the P2S probably wouldn't and something much more expensive would account for this - like a stratasys printer