Drill Adaptor from ±12.4mm to 10mm

This is an adaptor for my step drill to allow it to fit in my chuck which can only take up to 10 mm drills.

I would print with 100% infill and 0.2mm on a 0.4 mm nozzle, then cleanup the edges.

Makes use of two M3x5mm bolts

Im unsure how it will hold up over-time or when used for drilling into hard surfaces like metals or hardwoods. Has worked for me in plastic and soft-woods.

There are two versions. 0.4 is smaller and 0.5 has thicker walls and is a bit longer.