WhatsUp3d shared an awesome design using gridfinity. However I'm not a gridfinity user. I downloaded the setup they posted, I really needed the rail system from this upload. I uploaded WhatsUp3d rail in fusion and designed my endcaps around it. My end caps allow the user to remove the rail to take all the tools on the rail. This is easily done with adjusting the screws that hold down the endcaps using the toolgrid screws. With the screw just snug enough, you're able to slide one end of the cap over to “release” the rail. Just slide that same back over the rail and it will remain in the box and not lift up, that will allow you to remove a single tool if you desire. 

I printed this with PETG, I'm sure other materials would work. Use whatever you want.