What is default printer command line? How can I adjust the default printer via command line? What command should I type in the command prompt?

 I am a professional photographer and have used almost all technology devices for taking pictures and printing them. Recently I have heard about a new device called Polaroid ZIP instant printer. My friends have told me some features about it but I am yet to explore it. Can some tell me about its size and price? Also what technology it uses to print pictures? How does it get refilled? Does it needs to be installed somewhere? Please help.

Last week I encountered a problem while I was printing using Epson XP-410 printer, I cleaned the print head with a soft clean wet cotton wool piece but after cleaning it became dim and colorless, then I realized that printer can no longer print in black color.  I have tried cleaning it with a cleaning unit but same error. Kindly help me to fix this issue, Can somebody help me?

I have a canon home printer and have been using it quite from past 5 years. In the recent past I have started to observe that, whenever I give print, it simply says printing and do not complete the task. The only way to recover is turn off both my computer and the printer. Again if I turn on both, and issue print, it must probably work fine. What do you think is the problem? Once it starts to print, it still never gets stuck. Currently I have solution but it is only temporary. Can anybody guide me on this to get one solution which is permanent?

Recently, I bought a latest HP Printer for my Official work with multi color control. But those colors are mixed up while printing the colorful photos and pictures. The words are also not printed properly. What is the reason behind this error? Is there any way to fix it up at home?

Hello!

I just recently bought this scanner few days ago. I want to set it up now but after I finished installing the device it posted me message, USB device not recognized. How is this possible? It is supposed to be plug and play device. Can you give me reasons why this is happening? Can you give me also instructions on how to resolve this problem? Can you give alternative solutions that can help me eliminate this problem not just with this but for other devices also? Thank you!