This is a simple spool holder for a Bukobot. Seems to works very well and keeps the printer steady.Just screw the carriage bolt though the back of the spool holder then attached 2 washers and a nut.Check the spool isn't touching the front corner bracket bolts of the Bukobot. If it does add an extra nut to space away.Press the 608ZZ bearing into the bearing bushing.A V2 version was added to ad clearance for the Bukobot V2 Z axis threaded rods.