Network printers are able to connect directly to your network using Wi-Fi or Ethernet, and are available to add for anyone on the same network by default.
If you have a printer connected to and setup on your computer instead, then you will need to share the printer before it will be available to add for anyone on the same network.
Network printer sharing allows another computer on your network to print to the printer connected to your computer on the same network.
The HomeGroup service will no longer be available starting with Windows 10 build 17063. The user profile used for sharing and the file/folder/printer shares will continue to work.
This tutorial will show you how to unshare or share a printer over the network without using HomeGroup in Windows 10.