Roller Variant of Top Rail with Click System

I really liked Sam's update to the CORE One MMU3 Community version, and loved the idea that Tom came up with to make the spool holders more securely snap into place. I wanted to use the roller variant of the spool holders though. So, I created this remix that will allow the roller variant of the spool holders to securely click into place on the top rail. To use, follow the instructions that Sam provided, and simply replace the top rail piece with the versions I've included here. (Note: for those that have access to a printer with a larger print bed, I've also included an ‘extended’ version that will extend the top rail slightly beyond the width of the CORE One. The regular non-extended version works just as well though to help secure five spool holders.)