This remixed articulated “flexi” octopus holds 16mm/5ml diameter sample vials full of fountain pen ink to stabilize them during use.
The hole was made with negative volume in PrusaSlicer.
The hole isn't wide enough for most vials with labels to go all the way through, but fits enough to make it stable and accessible. Adjust the size of the negative space to fit the vials as needed.
The author remixed this model.
This model has a 16.1mm hole straight through the center made with negative volume in PrusaSlicer