Keychain bit driver and bottle opener

thingiverse

This is a really cool and useful keychain bit driver. it can hold two-bit drivers ideally one regular and one Phillips. The print is strong enough for minor repairs and can be torqued on pretty hard. Two o-rings are used to keep the bits in place. The size is up to you the smaller you go the less likely the bits are to fall out but the harder they are to remove. Most hardware stores will have O-rings out in the open that you can use to test before buying. NOTE: The keychain hole should fit a small size keyring. I used a piece of string for mine for the look of it. The tolerance on the hex should be tight. Use pliers to work a bit in and out to break it in. PLA will work but the bottle opener will eventually wear down. The stronger the filament the better