on one plate Dual extruder CTC 3D printer

thingiverse

This upgrade Requires Support and works with a V Groove Filament Guiding Bearing (3x12x4mm) as well as a normal flat Bearing (3x10x4mm). If you're satisfied with VERSION_1, there's no need to make this one. Here are the changes: 1) The pivoting arm was made even thinner at the top for compatibility with all printer versions, especially those with covers on top of extruder motors like CTC printers. 2) The V-groove gear is easier to fit inside the arm, and the V-groove hole was cut in front to accommodate smaller (3x10x4mm bearing) use in printers without V-groove bearings. 3) A guide hole at the bottom of the base for the filament was added, as previous designs lacked this feature causing incorrect loading issues. 4) The offset spring alignment issue is resolved. This is my final version; I see no room for improvement. If it still doesn't fit your printer, seriously? The 3dm file is provided; make your own changes!