use this as emergency replacement of your metal point..
just don't use this replacement against a wall.. trust me, metal point is more suitable one.. :)
shaft OD = 6mm
so i create the ID (hole) of the Arrow point / nock to 6.3mm (PLA shrinks post printing), not sure how many mm it will shrink if you use ABS..
i use slow speed.. and print one at a time (without Raft) or group of 4 (with Raft)