Measuring Ink Level

[Measuring Ink Level]

Yes, all working well.   
But to be clear, there is no way to know how much ink is in cartridges anymore?

 

[Measuring Ink Level]

Successfully updated Epson WF3720.    First fw update, stuck at 97%, second try, 98%, third and fourth tries, 99%, never would finish.  But pulled power, turned on printer and successfully activated.   Thank you!     

However I have to ask, how does a person now know when ink cartridges are low?   Going to use refilled cartridges for a while but don't want to run dry and risk print head problems.  What are ways to see or estimate actual ink usage?      Seems it will always show 100%?