The most difficult problem to overcome with flatbed UV FB printers for me are inks. If you have good ink, you can build a printer around it relatively easily.
The price of inks I don't think is that important and I find the use of non-original inks a mistake, no matter how cheaper they are.
Everything becomes more expensive when the machine is under repair and does not produce.
The second most important problem for me is the vacuum of the tables.
It must be able to be controlled in very small areas and be able to be very strong when necessary and without affecting the print heads.
But this is not easy to construct. All manufacturers work in the direction of speed, ink price, resolution, etc. and seem to underestimate the loading time of the machine and the vacuum that will keep the various materials stable on the tables.
The temperature of the lamps
The high temperature of the lamps (whether mercury or LED) strongly affects most of the materials and imposes a stronger vacuum of the tables.
I can't stop writing for a few more hours.
The speed
Speed is important, but it's when only you have a fast machine. When your competitors also start to have fast machines, the speed becomes slow again. When the print speed significantly outstrips the other processes after printing, this speed becomes completely meaningless.
Machine control software.
It should be stable, look tidy, give wide control over the machine, but not excessive.
Carriage height.
Now I remember how with some cutting machines, the curves on the table can be traced and recorded. I haven't heard of this option for printers. This will slow down the print, but will guarantee it without a hitch. And this can shorten the printing time on some materials. Option, when needed
.
... and the printer start to be expensive
))