Hi Smithy, Thank you for your reply, I was about to call it a night, I did try everything, yeah rasberry had a network connection and had an IP address from router, yeah I was able to connect to the octoprint web gui. But , I think your reply made it work ..... lol. after reading your reply went back and switch on laptop, 3d printer and rasberry pi: everything looked fine, rasberry pi network connected , octoprint on my web browser connected to printer, so i went and open cura to have another go, and Guess what, ....... this time there was an octoprint instance to choose from, so , i think your message made it work ......lol.
My Ultimaker Cura is connected to Octoprint 🙂 . I have sliced a file and clicked print with octoprint to test, "it's working" printing as i write this message, I guess i'm staying up a little longer 🙂 . Thanks Bud.