Headphone support V2

18/05/2019 Version 2:

Version 2 has been improved for printing in the back; now the print should look more beautiful.

I added an empty space inside to add weight; in the previous version, heavy headphones tend to overturn everything. (fishing lead should be good)

I removed the screw holes; just add a thread of glue if it goes too slow.

The top part, I made a change to print better.

you should print without media; otherwise it will be difficult to eliminate supports inside.

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