Minimum Solid Figure traced by a Delta 3D Printer
I think you misunderstand. It's the nozzle width and extruder step size, not the axis step sizes, that limit detail. Positioning resolution on a typical printer is on the order of 0.01 mm, but nozzle size is at least 0.1 mm and typically 0.4 mm. Also, lack of perfect rigidity in the mechanical parts will produce gradually increasing error as you try to go smaller and smaller in detail. So, it really makes no difference to the achievable detail whether the printer is a Cartesian or a Delta.