Print the parts, melt the fusible links, install the ice cream stick in the bottom part, tighten the screw. Insert the stick in the top part, install it on the edge of the spool, tighten the screw. Perform the calibration on a full and empty spool.

Used M4x20, M4x12, 2 x M4xL4xOD5

You can also modify the model, the source in freecad is attached.