Hello,
I was asked about possibility to print a web map from a mobile device.
Is it possible?
Is it possible from Web Builder application?
Assuming you mean in an Offline Mode - I would think your best bet is to create a PDF on the device then "send" it somehow to your printer. In a Cordova environment you could use something like Bytescout PDF Generator SDK for Javascript | ByteScout
I'm sure there is some equivalent in the native environments.
If you are connected you can simply use the ArcGis Server print services.