Arrowheads for target practice!
These will fit and will not break on anything as soft as a hay bale. If you decide to shoot rocks, you can get the broken plastic out by heating up the plastic and using a screwdriver to make a mold. When it cools down, you can unscrew them out.
This will fit a standard arrow shaft if you screw it in. It takes about 9 minutes.
0.2 mm layer height
1.5 mm wall thickness
25% infill density
Yes to rafts and support.