Summary If you are anything like me, the tiny allen keys (Hex wrenches), are REALLY difficult to grab and work with, even when trying to simple pick up off the table. Made these simple sleeves to give a little extra grip. Obviously they are small and your printer needs to be pretty accurate. You can adjust sizing if needed in slicing to accommodate nozzle size and spread.. sizes are 1.5mm 2.0mm 2.5mm 3.0mm anything bigger isn't much an issue I find...