Cubic tube rack - Each face a type of tube
thingiverse
You might want to add some magnets or screws to the corners, and bind several of these together. GitLab repo: https://gitlab.com/naikymen-space/hardware/gradilla_bea The FreeCAD files are over there. Note: tour tubes might be slightly different than mine. For example my PCR strip tubes were 9.1 mm apart, when according to the SBS standard it should have been 9.0mm. You can mess with the FreeCAD to adapt it before printing, or leave a comment/issue on GitLab: https://gitlab.com/naikymen-space/hardware/gradilla_bea/-/issues
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