I you aren’t worried about too precise a fit, you can enlarge the printed hole diameter, typically by about the diameter of the filament print nozzle (if using FDM printing). At least, the printers I use (which have a nozzle diam of a nominal 0.5mm) seem to print along the centreline of the edge of the modelled part, which means that the edges of the print are 0.25mm off the centreline - outside making it larger, or round a hole, making it smaller.
For example, a rectangle drawn 10mm x 10mm will end up around 10.5mm x 10.5mm printed, and a hole drawn 3mm diam will finish up about 2.5mm diam.
To fit a 1/8" (3.2mm) rod, with a nozzle 0.5mm diam, try drawing the hole 3.2 + 0.5 = 3.7mm diam, or 1.85mm radius in SU.
You can probably do the same sort of thing for a laser 3D printer, but I wouldn’t know how much to add to the hole size. Probably, its nominal resolution.
There may be cleverer slicing software than what I use (Lulzbot Cura 3.2) that automatically does the offset for you, but mine doesn’t, and it often takes a few test prints to get mating parts to fit.