Test Tube Stand
thingiverse
Fully customizable/parametric test tube stand. The default dimensions work for this set of test tubes: https://www.amazon.com/gp/product/B01N79SSZB/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 You can change the number of test tube slots by adjusting the 'num_hole_x' and 'num_hole_y' variables in openscad or customizer. You can adjust the diameter of the test tube with 'hole_dia'. 'step_size' will roughly control the spacing between slots. I use these for pre-weighing and preparing coffee bean doses for espresso.
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