There is a subreddit for DIY in ear monitors. Pay close attention to the first post on this page in particular: https://www.reddit.com/r/DIEMs/comments/kfdwf5/m

There is a subreddit for DIY in ear monitors. Pay close attention to the first post on this page in particular: https://www.reddit.com/r/DIEMs/comments/kfdwf5/made_my_first_3d_printed_shells_with_an_iphone_11/ https://www.reddit.com/r/DIEMs/comments/kfdwf5/made_my_first... However, you do not need a 3D printer at all to make wonderful in ear monitors. Also, I prefer clear shells (as a color for the headphones) by far. It is also not difficult to make proper ear impressions, too. See this for example: http://static.speedwaymotors.com/pdf/910150509.pdf http://static.speedwaymotors.com/pdf/910150509.pdf However, this was my basic search technique to find this document about making your own ear impressions: "impressions" AND "ear" AND "bite block" AND "make" filetype:pdf I made a post that is lower down on this thread that gives the 411 on everything you need to know including using them with a phone that does not have a 3.5 mm jack. This includes for microphone use, like making phone calls.