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Check if Autoload is enabled. If it is disabled, enable it. Do you use a heavy roll, but don't use the media flanges? Check if the pinch rollers are ok. Does you set the outer pinch rollers to lower pressure?

An ICC-Profile will not help with the dithering. It could help with the „slightly off colours“, but that kind of printers are hard to calibrate. Could be that on older versions of Flexi profiles are available, but because of this machine isn‘t been sold anymore for more than 15 years, they...

Regularly, if you do not print with spot color ribbons that match the needed colours (and define them in the file), you will not have „full“ colours. In addition, thermal transfer printers are printing with a very rough dither. Check Chapter „Halftone (printing process) at Wikipedia.

There are additional things to consider: Color is reflected light. So it could happen that the same print, viewed under different light conditions, can look different. The reference light for ICC-Profiling is named D50, a light similar to daylight. There are light indicator strips available...

Another difference between 115 and 315 is the missing OMAS-Sensor, which adjusts and control the media feed permanently.

The linear encoder have nothing to do with cutting, problems with the linear encoder will show up in printing. For cutting, the Encoder on top of the scan motor is responsible. ENV. MATCH calibrates both encoders together, but won't help in my case. Think of suggesting this friend to cancel...

Thank you for your answers. I haven't tried to do auto adjustment, I have tried to adjust manually in the service menu. But the deviation is more than the adjustable range. And the deviation is uneven, very different between left and right. I agree that it could be something with the encoder...

A friend of mine owns an old SP300V with a strange problem: Cutting contour is way off (more than 1cm) on the right side of the print, but will be a millimeter only at the left side of the print. I have varried out ENV MATCH, have checked the adjustment values, have done a LIMIT INITIALIZE...

In Flexi exist a possibility to rotate the job about 90 degrees. So it would be possible to set a bunch of small jobs crosswise over wide media, using nearly the complete width of the media.

Have you replaced the head yourself? Could it be that, after replacing, you haven't filled the head with ink? How the damper looks like, or the tubes? Are there ink in it?

One important step in checking colors is to look at them under right conditions. Color is reflected light, and if using different light sources, colors could seem different. Check your grays under daylight or a D50 light source. On the other hand, if using generic profiles, it could lead to...

Up/Down-Encoder means the tool, not the OPOS.

If you really have OPOS-CAM, then the camera will regularly not lowered. If you have regular OPOS X, this sensor will be lowered. But, could it be that your cutter reports a problem with lowering the tool? I agree that you need to buy a new head.

If your SP300 has the old type installed, you need a conversion kit to mount the new pump. And you need to change a setting of the ink pump motor.

If a software overwrites your cutter settings, and you have no idea to avoid that, you could set the cutter to „ignore tool commands“ in the communication menu. But this could lead to other trouble.

Flexi would let you assign different settings to different colours, and - since v19 - to layers too.

Have you tested what I have suggested? Downloading the factory settings from the Summa Website und reset your cutter?

I do Summa-Support since 1997 and never had both motors and the OPOS-Sensors failing at the same time.

Show a nozzle check. Are the colors correctly assigned?

Why do you put a code in? The summa cutter should read the barcode itself and load the appropriate file. 6 or 9 is the number depending of the orientation of the cut job. What version of onyx do you use?