AirPrint Cube

What you asked for is called an AirPrint print server, a network-attached device which allows network Wi-Fi clients that implement AirPrint printing to access and print to printers lacking AirPrint, and AirPrint print servers are available.

That is, what you asked for is available now.

Search for AirPrint print server in the previously-linked AirPrint article for the list of print servers published by Apple.

Again, these AirPrint print servers are print servers (your “AirPrint Cube”), and not printers with AirPrint.

HP has been making similar devices for aeons too, called JetDirect print servers. Recent JetDirect models have added support for AirPrint for connecting into HP printers lacking AirPrint support. These are targeted for HP printers, and not the generic printer support that you’ve requested.

TrentosX wrote:

You guys should develop, market, and sell an AirPrint device or "AirPrint Cube" that allows consumers to print via USB for all printers that are not AirPrint compatible.

P.S. Disclaiming any title to name "AirPrint Cube"

We're other users and other app developers, and not folks that work for Apple.

You can send your feedback and suggestions directly to Apple, as they may or may not see postings here.

http://apple.com/feedback/

As for your suggestion, such devices are available.

Search for "AirPrint print servers" here:

About AirPrint - Apple Support

R&D stay way away from these forums:

Sharing an idea with Apple: So you have n… - Apple Community