So if you stick up additional mesh nodes that offers better signalling that the incumbent (to your printer) it might flip once, but once it's done so, you'd expect it to stick with the "better" one. It would be a "bad thing" if clients were constantly "hunting for the best signal" as the could end up flipping around AP's frequently and needlessly, hence client need the signalling to drop off quite significantly for a period of time before they initiate a roaming assessment.
Having multiple AP's shouldn't be a "problem" though there's nothing to stop your printer choosing to change which AP they are Associated with (it's the printer that chooses, not "the system") but generally once a client is in session with it's chosen AP, it sticks with it until there is a good reason to change. You can see them all if you use a Wi-Fi Sniffer such as Acrylic Wi-Fi or InSSIDer - in a site with multiple AP's, you'll see the same SSID listed multiple times, but the MAC addresses differ for each AP. There is another identity each AP uses which is a MAC address and this is what allows the client devices to choose which AP they want to talk (Associate) with.
With Wi-Fi systems made up of multiple hotspsots, each hotspot "advertises" it's presence independently of all the others, even when they have the same (human readable) SSID name - as with many thing in IT, a lot of what you "see" when using the technology is an illusion. What is producing the "no filtering" error message - the printer itself or something else.? (The printer does not have to be connected using Wi-Fi for other Wi-Fi devices to print to it - it just needs to be "on the network" somehow.) Though one appreciates that sometimes geography and aesthetics dictate that permanently connecting on ethernet is sometimes not an option. If you can ethernet connect it permanently and not use Wi-Fi at all, that would be a better alternative in any case - thusly it leaves more "air time" available for the rest of your Wi-Fi devices. If you cite the exact model number of the printer, (it's often on the self test page and/or the "serial number" label,) maybe we can go find a user guide online and see if it tells us what buttons to push.
HP PRINTER MAC ADDRESS FILTERING SERIAL
Some devices might allow a kind of "back door" to this so that if you've got it ethernet (or USB) connected, (temporarily,) then you may be able use a tool to configure the Wi-Fi settings (in olden days on "big" it you might have hooked up up a temporary link with a serial cable to a special "config" port - but a lot of cheap SOHO gear lacks this.) If not, you've got to get it on the network using the tools available on the device itself. You've got to establish the network connection first, and that probably means using the control panel on the printer itself. There's literally no way to "talk" to it until you've established a network link. If you do not wish to have MAC Filtering on for your network, simply turn it off or disable it.Be sure to appreciate that if a printer has no network (or other) connection, no amount of adjustment on apps running on anything else (phone, ipad, pc's, router, whatever,) will make any difference as so doing is not communicating with the printer if it has not yet bound to the (Wi-Fi) network.
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