I really like the design of the delux spool holder. I found that sideways holders end up causing jams when the spool starts to run low, because the filament has to bend over the spool wall at pretty extreme angles. However, the delux spool holder requires either removing the top cover or cutting it. I've redesigned the hook attachment so it can be used without removing the top cover. You have to push the cover upwards first - that will give you access to the back wall (see pictures). Then just hang it like it's shown in the picture. Once you have the spool hanging on the holder and the filament threaded through the guide, you can push the back cover back down - there should be enough clearance for the filament and the hangers.
I made the axle small so it can accomodate spools with smaller hub holes - as long as the diameter is under 15mm, it should work.
I printed the hanger and the crosspiece with 20% infill, no support, 40mm/sec. The dovetail connectors are a very tight fit, but they do fit - they did on mine. If you end up using the axle, you need to print it with supports. I recommend printing it horizontally - printing it vertically would have printed layers stressed by the weight of the spool. I sliced it with Cura, since Cura's supports are easier to break off than slic3r's.