Contour cuts at 40 inches

I had a hard time with prints being off even on shorter runs if there were lots of cuts. I swapped out my pinch rollers and it made it exponentially more accurate. I feel it's more accurate now down the length of the roll compared to the width. Coincidentally I own an X3.

 

they look fun.
what type of material are you using on them. what pressure does it take to cut.
do you use extra rollers when cutting, on the vs540 you can get 7 rollers in.
as a note if you change the rollers the outer ones are conical and need to be the right way round there is a red dot on the side.

 

with the 540 came new with 5 extra rollers to plug in as required, presumed the 300 would come with 2 extra.
i have two 540s and would expect the cut to be no more out than 1 mm at 40 odd ins length.
over the years you have probably learnt these but just in case.. slow it down and slow the up speed very important. its quite a weight to be swishing about.
double check quality of knife and holder. very acute angles can drag it off line, if the pressure is above 150 expect problems unless all else perfect., not too much knife sticking out that causes the vinyl to drag a bit.
clean the bed bit of polish dont go amiss so the vinyl slides easily over the cutting strip whilst under the cutting pressure.

we cut most types of vinyls inc mx stuff just watch whats going on, as a test rather than cut put a pen in as there is no cutting pressures involved will help you find your problem, if the pen marks the vinyl in all the right places then not the reading of the marks at fault.

 

other possibility is feed rates set in the printer or vw, in theory the way roland work the cut path after its read the marks should equal it out.

 

ok substance superb material but likes to be kept flat not bending over the bed as you would standard materials, when we used to cut that on a graphtec i built on to it tops (shelf's) so the material stayed flat as it fed in and out, we now use a flat bed for the mx so we can cut then second pass perfcut with very very few mishaps.
notice if there is any bunching of the material near the rollers a sure sign its going off. try and do all your testing with cheap materials

 

meant to say if you cant get it correct on $2 worth of material dont put in $20 worth

 

thanks for the offer see how it goes. keeping the material flat was the big jump forward for us tape a couple of bits of sign board on the machine to test vinyl boxes for legs. then build something better if good., was trying to find pic to show

 

This doesn't always work... we could NEVER get print & cut to be accurate on our VS-540 with 3M IJ1220-10G vinyl. Nothing we did could get it to cut accurately.
However, every single other vinyl worked fine. Sure they all cost more, but at least they worked.

 

When I nest everything for print on substance, I never go beyond 36". Like you said though, it's tough. Sometimes the pieces for an X3 and other SXS's are very large and it's unavoidable.