The ORD Bot Hadron doesn't have a good system for managing filament so I put together this simple system. It's a free-standing spool holder and a guide that installs on top of the left vertical rail. You'll need to drill and tap the rail for M5 screws to secure it. The filament guides up through the X axis motor standoffs, through the guide and over to the carriage. Nice and clean. I use a zip tie to keep the filament from backing up into the drive belt. The spool holder is sized for full size spools from Protoparadigm, but it should work with most.