Thinner Spool Hole Spool Holder

http://www.youtube.com/watch?v=oly6A4GSLD0
Thinner Spool Hole Spool Holder for CTC Replicator / Flashforge / Wanhao and others with a 30mm rear hole.
the factory holder was 30mm. too thick for most spools.
this one is only 20mm, so all spools should fit onto.
nuts are already prescaled to 104% to fit with pla.
ready-to-print.
prints without support and without raft from pla.