what I have been doing recently is running prints at 0.1mm layer height and 150mm/s on the he3d delta.

In the three years I've had it - it never occured to me to try that before the last couple of weeks :-)

I've been designing a pocket solitaire set that uses 4.5mm steel bb's (has flexible top, little magnetic stick for moving bb's and a foam pad to keep the bbs in place when not in use). So the individual holes on the board are tiny and to keep them curved you need to print at very small layer heights.
So just for a laugh I thought I'd see how quick it would go.
Turns out - very quick lol

I mean I've printed no end of things at 0.4mm layer height and 150mm/s - for rough practical items. But for some reason it never occured to me to do the detailed stuff at that speed.
Saves an awful lot of time I can tell you :-)

So basically in a round about way what I;m saying is that you do not need a small or slow printer to print small and detailed models.

A large print volume machine will happily print small and detailed as well as large and crude.
BUT a machine with a small print volume can only print small items :-)