Thanks, ISF. I don't think ink has much to do with it.
What my print looks like - but the amount of offsett in the print varies a lot with each run of the alignment programme.
On the Mac, there are only 3 lines in the alignment programme. These two sheets show 4 runs of the L1800...
I have an Epson L1800, fitted to a Chinese flatbed; printing ecosolvent ink onto plastic items. Normally very well! However, when I go to align the printheads the alignment immediately goes WAY out of alignment and cannot be restored. Have printed hundreds of alignment pages. Cannot get good...