First approach of a customizable thing.
Holder for sewing machine cones, type miniking. If you're unsure just use the default values and adjust only rows and cols.
Sample with 4x3 fits for Sovol SV01, my target printer for this thing.
Sample 1x1 is just to figure out the printer settings and if the cone fits.
For better stability of the pillars, I set the minimum infill to > 100mm2, so the pillar and the top of the stabilizer are filled completely.
See also the version with threads: https://www.thingiverse.com/thing:4112893