I saw JBFromOz's spool holder but wanted something a little different and designed this. The arms click in simply, but it needs to be printed at an angle on the bed one arm at a time to fit. I had no trouble with warping on glass with ABS Juice. The spool holder arms allow for 260mm diameter spools.The spool spindles are designed to take spools with holes from 24 to 40mm diameter. They can be fitted with a standard 608 bearing (most commonly a skate bearing). Hardware needed, 8mm threaded rod A few 8mm nuts Additionally: 2 x 608 bearings.Make sure you rotate the angle to print the arms. On a standard size bed 200x200mm I could only print one at a time. You might need to press the bearings in, I just placed the spindles with the bearing partly in on the ground and trod on it.Once printed, clip onto top rails and fit spindles and threaded rod.