18650 to double C adapter

Pimp your electric application! I was looking for an adaptor to replace the C batteries and pimp the n*rf a little.This adaptor replaces a double C battery tandem. Just add a M3x30mm screw in the hole for electric connection.Be careful, a single 18650 has almost 50% more voltage than a double C tandem, 4.2V fully charged vs 3V. This can damage your application, but also boost the motor performance. A lot :-)Print with low infill and 2 perimeters, should be sufficient. The screw should be screwed, due to low infill you may break the hole.