When you're working on 3D printers you need a place to put things.  This small work station has compartments to hold the hex nuts & bolts as well as other small pieces.  There are also two small magnets to hold your hex wrenches.  You will need two small 5x2 round magnets.  I get mine on amazon.  Get a bunch and see how you can use them in your prints.  Use the pause print function to place the magnets in.  Be sure to only put one layer of filament over the magnet.