@JeffHolland Something like this may work for 3D printing the flexible and transparent portions. I have personally worked with TPU as being an economical method for semi-flexible prints (assuming a very low infill < 10%).
Posts made by dowdt
RE: Crinoid Bio-Medium Aquaculture: Nutrient Flows in Classroom Aquaria
From a perspective of 3D printing, might it be more robust to have a thicker stem which plugs into the base? A rectangular socket would also prevent rotation of the attachments (though due to their symmetry, it doesn't look like that is an issue).