I have a mimai jv3-160 and here is what I did to print double sided and have it line up perfectly! If you are getting the tops and bottoms of the banner to line up that is half the battle. Now you just need the left & right sides of the banners to line up. Here's how I did it. Once the printer is set up with material loaded and it is ready to be put in REMOTE, I took a pencil and made marks on the edges of the banner lining up with landmarks on the printer. In other words I made marks where the horizontal aluminum and black strips lie on the left and right side of the vinyl near where the print head passes. Then I followed the mark on each side around to the the back side of the banner and made similar hash marks on the back side. Remember which "landmark" you used to line up the pencil marks with. This is your "registration mark" Now when you flip the banner over to print the back side, if these lines are lined up with the same landmarks on the back side when the printer finishes registering the vinyl, you are golden. Now it's important to know that when you load the vinyl and align the marks on the back side, your printer registers the vinyl and then moves away from the mark and they will be out of alignment. Then you have to use your arrow buttons to move the vinyl forward or back again and realign the mark. As you do this you are changing the location of the origin. When it lines up, hit enter and the new origin will be established. However each time the machine advances or shifts the vinyl slightly when it does it's final registration. On your machine, you may have to make a second mark after the machine shifts using the same landmark and measure the distance between the first and second marks. That tells you how much the vinyl has shifted. Measure the amount. I think my machine shift was 1/4". Then just shift your line 1/4" the opposite direction from what the material shifts the vinyl and when the machine shifts the line will line up with your landmark. Once it lines up after the machine stops shifting the vinyl, you know you are ready. I think I printed about 14 banners in a row that lined up perfectly front to back. I only needed 14 but I'm sure it would've kept in alignment if I needed more. So just in review, I made marks aligning with some landmark on the printer, found out how much printer shifted after loading the vinyl with the marks aligned and then reloaded the vinyl so that the marks were off the amount the printer shifts the vinyl when loading and then when the printer finished its registration, the lines lined up. That allowed me to know that whatever I printed on the second side started printing at exactly the same point as the first side. Anyway, hope that wasn't too cryptic. Good Luck.
