I have been working on my Wanhao Duplicator i3 mods for last month and finally (nothing finalize but at least working) :) I manage to print good quality dual color.
The mod list is;
Long 8mm bearings
Z brace
Knurled Nut - platform Leveling Thumbscrew
Ramps 1.4
Fan extender
Z level extent
2 bowden extruders
Chimera Mount olate
Chimera dual extruder
All steel throats
Led lighting on the frame
Led lighting back of nozzle
Cooler Fan Mount and 30mm cooler fan
Layer fan mount and 40mm fan
Case for Ramps
Case for 12864 Full Graphic Screen
MKS TFT28 Graphical Interface extension
New Filament Holders at top
Tool holders
Small Bed clips
Borosilicate glass and PEI sheet sticked on it
I use AquaNet extra strong hair spray for bed adhesion
I mostly print with PETG, PLA and ABS
I also tried Cyclops but it is very hard to maintain it. Instead I spend couple of hours to adjust two nozzles and I managed to level them. Not an easy process but will be done once.