UPDATEV3.1: +1 x Longer Arm for Nicolinux :) + 4.5 cm.

UPDATEV3: Shorter arms, better tolerances and longer main / cap and inner (2 cm) which gives more stability and fits better.

My version of a filament spool Holder for the DiamondAge (and potentially other) loose filament. No bolts, no glue required.
Just print 4 x arms, 1 x cap, 1 x inner and 1 x main.
Insert 3 arms at first, then mount the filament spool and insert the 4th arm, press in the inner piece and screw the cap on. Done.
Should just fit the UM1's spool holder and also should clear the extruder mechanism on the stock UM1.