My Copam will not pull sign vinyl from a fresh roll. It was a gift so I ain't gonna complain.
It
WILL begin cutting where I tell it to, as opposed to a favorite brand.
I discovered a consistent way to cause it to track to at least 10 feet.
I set the alignment with tape markers on the front panel, lock the rollers, run out 10 feet of vinyl off the roll into the basket. I do the measurement set, then using the forward arrow I run out the 10 feet. I make small adjustments as necessary and run the vinyl back into the basket. Repeat until it tracks within 1/8".
I clean the rollers with Simple Green daily. Contamination will cause the rollers to slip. I did snug the adjustment screws nearly to the max long ago. The "clamp a dollar and pull it out test" works well to get some reasonable degree of equal tension..
I just finished thirteen 10 foot banners with no hitches using WINPC, four lines of text cut to 68 inches long.
ken
