Tube holder, testtube rack, openscad
thingiverse
I needed a compact bottle rack that could be adjusted to fit various sizes. Making it adjustable seemed like a great idea. Openscad files can be tailored to suit individual needs, with detailed instructions provided right in the file. I've printed several different-sized racks, and they work beautifully - although printing them does take some time. I've also been showcasing openscad code for groups, which is really useful as it includes if statements and nested loops.
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