A friend of mine is getting married and had an idea for wedding favors for their guests and enlisted my help to make something for them.
I highly recommend a wood based filament for the best finish, and they can be stained to whatever suits your needs.
These test tube holders are designed to fit larger than average test tubes (link below) that are then filled with coffee beans, tea, or hot chocolate. This way the wedding guests get to take home a beverage to enjoy at a later date.
They also serve a second function after the beverage has been consumed, they are perfect for plant propagation!
This way not only do the guests get a gift to take home with them and enjoy once, but then they can make it a permanent part of their home decor.
These are designed for 20mm or 25mm test tubes (see below), we went with the 25mm versions as they fit coffee beans better.