This spool to spool transferring was a bit of a pain so when I bought a large consignment of ABS from New Image I had them put it on their own 1 kg reels. New Image reels looked nothing like Delta's and would not fit onto the UP! spool holder, so I new I was either going to have to print a new spool holder or continue reel to reel transferring.
I was in a hurry with a mechatronic hand project, so rather than use the New Image spools I just unpacked one of my Delta spools instead. Imagine my surprise when I discovered that the 1 kg Delta spools won't fit on the UP! spool holder, either. Totally shocking.
In any case, I went down to the hardware store, bought some plywood, a large diameter bolt and a Lazy Susan turntable assembly. Here is the new spool holder that resulted.
It works beautifully with both my wide New Image spools and also the 1 kg Delta spools.