What Vase Mode Actually Does
By Inno Uncle
Vase mode — called "Spiralize Outer Contour" in most slicers — prints the outer wall in one continuous spiral, eliminating the Z-seam entirely. No retractions, no travel moves, no layer start/stop artifacts. The result is a perfectly smooth outer surface and a print that finishes in roughly one-third the time of a normal print with infill.
The catch? You get exactly one outer wall. No infill, no top layers, and anything beyond a simple continuous profile will fail. Despite these limitations, vase mode produces some of the most beautiful prints you'll ever make.
Getting the Settings Right
The default settings in most slicers aren't optimized for vase mode. Here's what I run after a lot of experimentation:
- Line width: 0.6mm to 0.8mm (with a 0.4mm nozzle). A wider extrusion gives significantly better wall strength and water-tightness. Your extruder can handle more than you think — modern hotends push 0.8mm lines without breaking a sweat.
- Layer height: 0.2mm for detail, 0.28mm for speed. Taller layers give a nice visual texture on organic shapes.
- Bottom layers: 3-4 solid bottom layers minimum. The base is the only structural element holding everything together.
- Speed: 40-50mm/s outer wall. Going too fast introduces ringing even in spiral mode because the print head never stops.
- Cooling: Maximum fan after layer 3. Single-wall prints need aggressive cooling because there's no previous layer beside the current one to act as a heat sink.
Design Rules for Vase Mode Success
Not every model works in vase mode. The key constraint: the outer wall must be a single continuous profile from bottom to top. No internal structures, no horizontal holes, no separate islands. Models designed for vase mode typically flare outward at the base (for stability during printing), have gentle curves rather than sharp angles, and taper or remain vertical.
One trick I use: design a spiralized planter with a slightly tapered base that flares at the top. The taper keeps the print stable, and the flare creates a visually pleasing silhouette. Drainage holes in the bottom are fine — they're on the base layer so they don't break the spiral.
Material Choices Matter
PLA is the go-to for vase mode — it prints cleanly and the wide variety of colors and finishes means you can create genuinely decorative objects. Silk PLA in vase mode is particularly striking because the continuous spiral shows off the sheen uniformly. I've had excellent results with dual-color and tri-color silks — the color shift happens gradually as the spiral climbs.
PETG works too but can be stringy on overhangs since vase mode can't use support. If your model has steep angles, stick with PLA. For a waterproof vase, PETG with a 0.8mm line width and 105% flow usually works. Browse our filament collection for silk PLA options that really show off vase mode's aesthetic potential.
Real-World Applications
Beyond decorative vases, vase mode is great for lamp shades (the continuous wall diffuses light beautifully), pencil holders, small trash bins, and planters. The speed advantage is real — a 200mm tall vase that would take 8 hours normally prints in about 2.5 hours. If your build plate isn't cooperating, a quality PEI build plate ensures that wide vase base stays put throughout the print.