My Epson 645 printer can't see the SSID from my Time Capsule but computers and iPhones can. Any explanation/fix?

Question

I could understand better if none of my devices could see the AirPort, but everything works fine except my Epson printer and my Canon printer--they simply can't see the SSID when I try to set them up.
I've had them a year, they have been working fine until today. I simply can't explain the printers couldn't se it, but everything else can.

Answer 1

Power cycle the printers themselves is perhaps the most important.
The wifi outage is related.. no doubt about that.
Sometimes Apple names are difficult for non apple (ie stuff made by anybody but apple) to work with.
If you have no luck.. full reset is the order of the day.
Use all names that meet SMB network standards.. that means short,, no spaces.. and stick with pure alphanumeric.
Apple wizard chooses your name.. plus device name.. so you end up with a name like
Fred Blog's Airport Time Capsule
This is hopelessly wrong.. reduce it to FBATC
The wireless name can be even worse..
When things go wrong.. setup names that are different for both bands.. and put the band in the name.
So tc24ghz and tc5ghz work well for me.  I often will have a gen number in there as I repair them and need to know which is which so tcgen324ghz is meaningful.. note no full stop.. no punctuation.. no spaces.. you could use other characters like dash or underscore.. but like I said.. stick with simple.
Last bit is channels.. wireless is subject to interference.. one thing that can happen is someone starting up a wifi device near you.. (or a microwave with a leaky door etc). Stick to fixed channels.
The idea is to remove the level of voodoo as much as possible.. ie from 80% to a mere 66%..
All wireless is voodoo but by controlling as much as you can.. you can reduce it slightly.