Test tube rack / stand for 11mm tubes
thingiverse
Test tube rack to hold 2 or 4 test tubes, diameter about 11mm. In bottom theres cutout to insert and glue M14 nuts to make it more stable. Optionally you can also use 8mm silicone drops to prevent it from moving on surface I printed it using "Fuzzy skin" feature in Cura 4.8
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