Morgan,
I would suggest you contact us a support@makergear.com

Have you been getting any errors? (eg. MINTEMP)
Have you tried printing via USB? (just as a diagnostic)

We would be happy to help you troubleshoot this problem!

Great suggestions from "sthone". I am also interested in what your layer height is. Especially, since you are having layer adhesion issues.
I would encourage you to open a ticket with us at support@makergear.com so we can help you get the results you are looking for.

I would make sure that your bed is level as possible. The taller your print is, the more crucial bed level is.

I agree with Tim. If you haven't done so, please open up a ticket with us at support@makergear.com
It does sound like a blown fuse. We need to figure out if it is and why this is happening.

Try running a M106 S255 and see if the fan comes on.

Swami,
If you email us at support.makergear.com we can help you get the right fans and firmware for your configuration.

Just want to add some clarification. Although I do modify firmware, I cannot take credit for writing it. (not that good yet) The VIKI 1 is, technically, not supported for Dual extruder models. Josh, the actual firmware author, found that firmware for you to try. We hope it will work well for you, ho...

That's right. Assign each model it's own process and assign each process to the appropriate extruder only.

Thats right. Assign each model it's own process and assign each process to the appropriate extruder only.

Thanks Justine, I will pass that along!