what he said :-)

OR
You don't say what the printer is (the nmore info you give, the better the chance we can help you)
As i understand it the capricorn tubing is simply made to a higher tolearance and thus has a smaller internal diameter than standard teflon tubing.
It could simply be extra friction.
Without knowing what the print looks like or what the printer is, can't say if it';s a bowden tube issue or not.

But My first inclination would be that you haven't pushed the tubing down hard enough.