Problem solved. There were a few dust particles on the print head.
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Thank you everyone for the help:).

<r><QUOTE author="AGS;152442"><s>[QUOTE=AGS;152442]</s>Is the ink splatter on your nozzle test sheets as well?<e>[/QUOTE]</e></QUOTE>
The test itself looks clean.<br/>
Today I've made 4 test mugs, 3 of them ended with black/gray dots (but not as many as on previous mugs), 1 was clean. So maybe there ...

<t>Already tried 4-5 different images and also 3x the same image. Spots appear on random places, even from the same image.<br/>
Images itself are fine, I've used them multiple times already in the last 2 years.<br/>
Dust - I don't think so, usually don't have problem with that and not on that scale ...

Thank you, I will try some more cleaning.

<t>Hello,<br/>
a few days ago, the paper in my printer (Epson L1300) jammed, the printer head smeared the paper, the paper itself was removed and there was no major issue.<br/>
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The problem occurred after that, each subsequent printout started pouring spots like in the picture, and to ...