I haven’t printed on gloss for a few months, but I have maintained my 3880 properly, and shaken the printer every few days. Yesterday, I decided to test the theory of using the linearisation droplet for varying amounts of GO. First thing I did was to print a 21x4 and measure it to ensure that all was as it should be. Comparing the linearisation from last time to now was a real surprise. I’ll attach screen grabs. The second shows a very nice linearisation that I did after getting my custom IGFS curve. The first is what I got yesterday showing quite a different result.
My assumption is that there has been sedimentation in the ink lines, and needless to say, the 3880 does not purge the full line when it swaps from MK to PK. I can’t think of what else it could be. If this is true, then:
- the argument for a universal black starts to look compelling. as discussed elsewhere on this forum
- how much does one need to print to get back to linear, i.e. how much ink is in the line and how many ml per A4 / Letter page will this printer use at 2880?
I hope that I’m wrong. It also occurs to me that some of my earlier issues with linearity in gloss curves may well be due to half flushed lines. Jon did say that my printer was weird.