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http://www.thingiverse.com/thing:3610580
Single extrusor Dual color by Octimusocti is licensed under the Creative Commons - Attribution license.
http://creativecommons.org/licenses/by/3.0/

# Summary

You can print each part with a different filament and then glue them together.
I gave it a tolerance of 0.2mm, if it still doesn't fit you can scale down the color part by a 1-2%, but it should fit anyways, you may not even need glue.

# Print Settings

Rafts: Doesn't Matter
Supports: No
Infill: 10 - 15

# Post-Printing

You may need to sand it down just a little