Spotify on MP3 player?

no, but if you buy the CD's and rip them (or get the MP3's from less then legal methods) you can put them onto it, unless it's one of the older CD/audio cassette devices.

Spotify has an added layer of protection that hinders the direct transfer of music to your MP3 player or other devices.but you can download Tunelf Spotify Music Converter to download and convert MP3 then transfer converted Spotify songs to MP3 players.

Yes you can. With the help of Audfree Spotify music converter, you can download Spotify music to MP3 and sync them onto your sony walkman player. As long as you keep it for personal use, there won't be much of a problem.

To play Spotify music on MP3 player, you could use the DRmare spotify converter for mac to help you. With it, you can easily put all your favorite Spotify songs on MP3 player or other devices directly.

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Not legally. 

Content creators allow Spotify to stream their content including offline usage, because they know that Spotify pay them a small amount every time their music gets played. Any offline playing gets logged by the app and that data gets sent to Spotify when it has a web connection.

Ripping CDs which you purchased from new onto mp3 is also illegal. But as long as it is for single personal use and as long as you still own the CD, then nobody enforced that as it’s not stealing content from music makers. But sharing the ripped files is undoubtedly harmful to content creators as they don’t get paid for their work. 

Same deal with Spotify: anything you rip from there is stealing from everyone who helped to create and distribute the content. 

When artists work hard to create something it’s like spitting in their face and emptying their pocket when you take without fair payment.

Loads of artists have simply given up because they cannot afford to keep producing music just for it to be stolen.

Real fans don’t steal music.

The other problem is that no App Store will host apps designed to steal content. So that means you have to go to other sites for those app downloads. People who want you to download malware are very well aware that the tempting bait of downloading a Spotify ripper is just what they need to sneak their own unwanted freebies onto your phone, tablet or computer.

So yeah, you CAN do as you ask. Doesn’t mean that you SHOULD do so.

Yes, you can use the TunesKit Spotify Music Converter to download Spotify songs and then use a USB to put them on your player.