There are a number of printable spool holders that use inexpensive skateboard bearings to reduce rolling friction. Some sit on the bench next to the printer while others mount on the wall. There might even be one that mounts on your Zortrax, although I haven't seen it. They come in two basic designs, ones where bearings support a spindle on which the spool turns and others where the spool sits on rollers having bearings in their center. If building isn't your thing, shop Amazon or other places that cater to 3d printing.
Good luck.
Jeff
