Wanhao Duplicator 4S Filament Tube Holder This is a modified Tube Holder specifically for the Wanhao Duplicator 4S inspired by.. http://www.thingiverse.com/thing:550152 AND http://www.thingiverse.com/thing:409297 Extends the rear filament tube holder locations farther back and higher.. Fits in same spot the tubes fit into for easy installation. I made this verson because the 2 already on Thingiverse did not fit the 4S quite right.. I needed this because I bought some huge 'triple size' filament spools from PushPlastic and this mod was necessary to let the big spool work with the 4S.. UPDATE: 02-13-015 Just uploaded version 2 which should fit just a bit better and also use a little less material during the print.. have not tested it yet..Print requires support material and a fan.. I printed mine with PLA using Simplyfy3d as my slicing software and also for the support generation..