I use a Prusa Mk3s which is great, but is more expensive. I have a couple of friends who have Creality Ender 3's and they are very happy with them. Once setup with the correct bed levelling and other settings they seem to work very well. I would check out 3D Printing Nerd who does some great videos on 3D printing, and has a review of the Ender 3 Pro kzbin.info/www/bejne/ooe1haOHnZqEoqc However the Ender 3 doesn't have a 300mm bed, so you would then need to look at the Creality CR 10 series, but then that starts to be more than your budget. If you get a printer, I would start with PLA or PETG. TPU is difficult to print, so does require some experience with 'easier' materials. I still struggle with TPU, and it requires a REALLY slow print speed and a lot of attention to get working. I also use Reddit to check out the 3D printing subreddits, so I would also check out the www.reddit.com/r/ender3/ subreddit. These are great places to go to get advice and tips. I originally started with a cheap 3D printer (Anet A8, which I would NOT recommend). Although it was a terrible and dangerous printer, which cost me loads to try and make it safe, I did really enjoy the hobby, so it allowed me to learn a lot before moving to a better machine. I suspect the Ender 3 would be a great starter for you. Hope this helps.

to show layers on cura you first have to slice the model and after that click on 'preview'

I printed a case to protect my new phone (originally did it for my new Pixel 5). Not going to drop test a £600 phone deliberately, but I have since dropped the phone a few times and have zero damage so far. It isn't going to protect the screen of course. I am still using the original case I printed, so it is holding up well.