metric pvc-pipe spoolholder

the spool-holders here on thingiverse so far where all designed around pvc pipes of various imperial sizes - this design addresses that :-)

build from a standard drainpipe piece with 40mm outer diameter a bit of wood, both cut to length and from the same hardware store :-)

simple/lean design, quick to print and assemble - and allows super fast filament change (no center hub to unscrew/mount)