Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5850899.

I made some 14mm bowl multiplier, because I saw a glass one and I wanted it! So I made it.

In testing of the quad/dual I found that the bowl multipliers can be too close to your face because of the height they add to your down stem. To remedy that I designed some angle joints and extenders which are also on this post.

And what I really love is every single one of those pieces are interchangeable stack-able they’ll work with each other, because they were made for each other!