Cloverleaf Test Tube Holder (inner diameter 14,5mm)
thingiverse
This is a custom-made test tube holder, designed specifically to support my girlfriend's collection of test tubes used for nurturing new plant growths. I created this simple yet effective holder by modifying a standard cloverleaf shape and adding a single tube - voila! Every inexpensive test tube available on Amazon or eBay should fit perfectly within it. As long as the outer diameter of the test tube is no wider than 14.5mm, that's all I require. Our typical standard test tubes measure between 14 to 14.2mm in diameter, so I opted for an inner diameter of 14.5mm for the holding tube, ensuring a snug fit.
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