This is a test-tube rack to hold test-tubes (~5ml) from the API Master Test Kit.
You can also easily dry test-tubes by turning them upside-down -- there is a notch at the bottom of the rack that will allow fluids to freely flow out of the bottom.
Make sure to print the test-tube holder on its side -- just like it is oriented in the thingi-view simulation above.
Comments/suggestions/criticisms all welcome!
No supports needed. Make sure to print the test-tube holder on its side -- just like it is oriented in the thingiview simulation above.
I was able to print without a brim, but use your best judgement.