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Tutorial 9 Min Read

Designing a Parametric Lampshade (Vase Mode Tutorial)

Lampshade Gen

Parametric shapes, ribs, and mounts — exported in seconds

Lampshades are one of the most satisfying things you can 3D print. They are fast, cheap, and the result transforms a whole room once a warm bulb lights them up from the inside.

In this tutorial you will build a custom lampshade end-to-end using the MegaSlicer Pro Lampshade Generator, slice it in vase mode for a single-wall seamless finish, and mount it on a standard E27 bulb fitting.

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Step 1: Choose the Right Bulb First

Before touching any sliders, decide which bulb the shade will sit on. The bulb dictates heat output, mount diameter, and clearance — which in turn constrain wall thickness and internal volume.

  • Use LED only. Incandescent and halogen bulbs radiate enough heat to warp PLA within minutes. LEDs stay cool and are the only safe choice for printed plastic shades.

  • Pick the fitting. E27 / E26 screws use a 42 mm spider ring, B22 / E14 use 29 mm. Our generator has presets for both under Spider Fitting.

  • Leave 15 mm of air. Keep the bulb glass at least 15 mm from any wall so heat can dissipate and the bulb's shape is not telegraphed through the shade.

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Step 2: Dial In the Silhouette

Open the Lampshade Generator. The first four sliders control the whole profile. Start with these values and tweak from there:

Starter Preset — "Classic Drum"

  • Height: 220 mm
  • Bottom Radius: 90 mm
  • Top Radius: 85 mm
  • Profile Curve: 0 mm

Starter Preset — "Modern Cone"

  • Height: 180 mm
  • Bottom Radius: 110 mm
  • Top Radius: 55 mm
  • Profile Curve: +20 mm

Profile Curve is the most expressive slider. Positive values bulge the silhouette outward (great for traditional bell shapes), negative values pinch it inward for hourglass or pendant looks. Drag it slowly while watching the preview — small changes have a big visual impact.

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Step 3: Add Character with Ribs and Ripples

A perfectly smooth shade looks generic. The Structural Pattern controls cast shadows on the wall when the bulb is lit — this is where your shade becomes interesting.

Vertical Ribs

12–24 ribs with a depth of 2–4 mm create a subtle fluted column. Go higher (32–48 ribs) for a crystalline effect, and switch Rib Style to Sharp for origami-style facets.

Horizontal Z-Ripples

Six to ten ripples at 1.5 mm depth give a pottery-style banding that hides FDM layer lines beautifully. Keep depth under half your wall thickness or the ripple will punch through.

Twist Angle

Combine 8+ ribs with a 180°–360° twist for a spiral shade that throws rotating shadow stripes. Keep rib depth modest when twisting — sharp twists create overhangs your printer may struggle with.

// Pro Tip — Wall Thickness

For vase-mode printing set Wall Thickness to match your intended extrusion width, typically 1.2–1.6 mm with a 0.4 mm nozzle. The slicer will collapse the shell to a single continuous extrusion, giving you a seamless, translucent wall that glows beautifully.

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Step 4: Configure the Spider Fitting

The Spider Fitting panel generates the mounting ring and spokes that attach the shade to the bulb socket. Three settings matter:

  • Fitting Type: Choose the preset matching your socket. For non-standard lamps, pick Custom and dial in the hole diameter.
  • Z-Height Position: 15–25% from the bottom is classic. Raise it for a taller “skirt” below the bulb; lower it for a more recessed look.
  • Spider Spokes: Three spokes is the sweet spot — they are invisible when lit and strong enough to hold the shade stable. Use four or more only for heavy shades above 250 mm tall.

The generator automatically orients the spokes to meet the wall at the correct twisted radius, so twist and ribs will not leave gaps around the ring.

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Step 5: Export and Slice in Vase Mode

Click Export STL to download the model. Load it into your slicer (Cura, PrusaSlicer, OrcaSlicer, Bambu Studio — all support this) and enable the following:

Critical Settings

  • • Spiralize outer contour / Vase Mode: ON
  • • Bottom / top layers: 0
  • • Infill: 0%
  • • Layer height: 0.2–0.3 mm
  • • Print speed: 30–45 mm/s for a clean finish

Filament Choice

  • • Translucent PLA — classic warm glow
  • • Silk PLA — highlights ribs beautifully
  • • PETG — more heat-tolerant near the bulb
  • • Avoid ABS near enclosed bulbs

Heads up: Vase Mode Ignores the Spider Ring

Because vase mode spirals a single outer wall, the slicer will discard the internal spider ring geometry. If you need the built-in mount, disable vase mode and print with 2–3 perimeters instead. For pure vase-mode shades, set Fitting Type to “None (Open Tube)” and glue a separate lamp collar into the top afterward.

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Step 6: Finish and Install

Straight off the bed, a vase-mode shade already looks striking. For a store-bought feel, spend ten more minutes on finishing:

  • Deburr the rim with a light pass of 400-grit sandpaper.
  • Warm it up briefly with a heat gun to soften any blobs — don't linger or you will slump the whole shade.
  • Screw on the socket finger-tight only. Over-tightening cracks the spider ring.
  • Use a 4 W–8 W LED. Anything higher is unnecessary and risks cooking the nearest wall.

Build Your Own Shade Now

Open the generator, play with the sliders, and you will have a printable STL in under a minute. No CAD skills required.

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