Arrow Nock

Sometimes on our archery practice the nocks jump from the arrow when hitting the target. I usually can't seem to find them nowhere, so i decided to design my on nocks to print them when i lose one. From the safety point It's always better to buy quality nocks in a store. I only used these in very low power bows. I've uploaded a Step file of the nock so you guys can change to adapt to your arrow sizes.