
Not every functional print is big
So, I designed and printed a crossover for a mini drill that uses "Mini"/H4x28 style bits that are 1/8 inch diameter hexagons, to enable me to use 1/8 inch diameter round bits. The round bits are actually closer to 3mm which gave me the clearance.
I had to print them with a 0.2mm nozzle using vase mode or the seam caused trouble. Add in a little dab of glue on the base of the drill bit, and it is snug and secure. They are single use since I cant get them off, but they also use ~0.1 g of filament.