Borrowed from the reference photo brief (ideas/ribbed_desk_vase/inspiration): tall ~2:1 cylinder, pronounced bulging shoulder, wide mouth, evenly spaced sharp-edged vertical flutes running from just above the base through the shoulder to the rim, no fillets on the ribs.

Print: spiral / vase mode (Snapmaker Orca "Spiral vase"), 2-3 bottom layers, 0.4 nozzle, any rigid filament; the slicer follows the fluted outer contour with a single perimeter. Printed as a normal shell instead, the wall is 2.0 mm between flutes and 0.8 mm under them. The shoulder leans out 28 deg and the mouth leans in 14 deg from vertical: both self-supporting. Not watertight for water without a sealant (single wall); fine for dried stems or a glass insert.

Assumptions (user unavailable): sizes from the brief's proportions, 150 mm tall; 28 flutes so the ribs and grooves are about equal width at the body; flutes straight (FLUTE_TWIST = 0).