This is a very simple block for holding various sizes of tubes commonly used in the lab. The file is available for free on Thingiverse to 3D print. Just flip them around to access different sized holes for different sized tubes. We've numbered the smaller holes to make it easier to keep track of what's what.
We've been using them recently to test on our orbital shaker v2.0. The rack system was doing a good job holding them in place as the tubes were shaken. We've got some improvements to make on the rack system and we will be updating that soon.
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