This is a 1.75mm Filament Guide for the Wanhao Duplicator i3. Inspired by the other designs here I created my own custom design since I am feeding from the Right Rear of my Printer. Guide can be used with out PTFE Tube but works Best when used with 4mm OD PTFE Tube with enough slack to allow extruder to move freely from left to right & top to Bottom. I used this thing: http://www.thingiverse.com/thing:932102 for hte extruder end and worked great with my 4mm OD PTFE. Included Pictures of the Part as printed, then Installed with OUT PTFE Tube and then completed Assembly with PTFE Tube. I will say this combo works great so far and no issues with dragging or Filament getting snagged.Printed Using Cura with Makergeeks 'Dark as Night PLA' ...I had to scale it x10 to get it proper size 1 : 1 My Cura Setting: Layer Height: .3 Shell Thickness: .8 Bottom/ Top Thickness: .6 Print Speed: 50 mm/s Printing Temp: 230 C Bed Temp: 45 C Support Type: None MY INSTALLATION: Remove Existing 2m m2 x 5mm screws that from top right Support Install Filament Guide using 2x m2 x 10mm screws ... snug them but do not use brute force