I made these and I'll be posting a make soon. The ear cups are pretty small, and so they dont form a very complete seal with my ears. The sound quality and bass takes a major quality hit because of this. Compared to these monoprice headphones that have served me for years and cost less than these parts, this print is just an inferior product. https://www.monoprice.com/product?p_id=8323&gclid=CjwKCAjw6djYBRB8EiwAoAF6oYYa9Nb1iZ8G8MCskX7BQCil9XFVU-0g3pI4sz3PkX5D4RS9DF4ZkxoCqQgQAvD_BwE
I think OVER ear, as opposed to ON ear, would sound much better. This design could be adapted to have much larger ear cups and fit a larger pad.
However, the quality of the design is excellent. The hinges, sliding pieces, and threads are extremely well designed. I'm really impressed with this quality of design and I look forward to seeing more in the future from the designer! Printed pieces that fit together and interact this well are awesome to see.