This kit attempts to retrofit your MBI or other horizontal filament spindle box setups for UltiMachine 5 pound filament spools as well as an adapter to quickly change back to MBI 2 pound spools.Print out the "UltiMachineSpoolBearingCollar.stl"Mount via your preferred method (I drilled holes and used zip-ties (I'm cheap)) to a bearing plate (I used: 300 lbs Capacity 4 Lazy Susan Bearing 5/16 Thick Turntable Bearings VXB Brand from Amazon for $2.99)Pop your UltiMachine 5 pound spool on top and insert back into your spindle boxWhen you need to slam an MBI 2 pound spool in, print out the "MBIAdaptor.stl" and your ready to mount back into your spindle box with no center slop!I posted up a few other mods if your a horizontal spindle user here: http://www.thingiverse.com/thing:13756 Keep it real horizontal spooler's!