TWO-SIDED KEYCHAIN – FULL COLOR

Two-sided Keychain to STL

Design a front and back that print as one keychain. The front’s shape defines the outline; the back fits inside it. Add a keyring hole or edge ring, and every color exports as its own STL.

Launch Tool →
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How it works

  1. Upload a front image and back image
  2. Remove backgrounds if needed (optional – skip it and the full image is used as is)
  3. Detect colors separately for each side, and fine tune any color you want
  4. Drag and scale the back image to position it within the front’s shape
  5. Add a keyring hole or edge ring if you want one
  6. Set thickness, pick your core color, and export – you’ll get a separate STL per color.
  7. Import into your slicer – load as a single object with multiple parts
  8. Select colors for the parts in your slicer. Hint – The color HEX is in the file name.

Detailed Instructions

Choosing your images

  • The front image determines the object’s outer shape. Whatever silhouette your front design traces to becomes the final outline — the back is fit inside it, not the other way around.
  • PNG with transparency works best for clean background detection, though it’s optional — you can skip background removal entirely for either side.
  • Leave a little breathing room around your design if you’re planning a keyring hole or edge ring, so it doesn’t crowd the artwork.

Background Removal

Optional and independent per side — remove it for the front, the back, both, or neither. If you skip it for a side, that side’s full original image is used as-is for color detection. A Detail slider per side controls the working resolution used for detection, separate from your final print size.

Color Detection

Detect colors separately for front and back. Click any swatch to fine-tune that color, or uncheck a color to leave it out of the export entirely.

Positioning the Back

Drag the back image directly, or use the Scale and X/Y offset fields for precise placement. The mirror flip needed for correct two-sided printing is applied automatically at export — what you see is the back exactly as it’ll look when you flip the printed piece over.

Keyring / Mounting

  • Hole in print — punches a real hole through the entire piece. Set position, diameter, and edge gap.
  • Edge ring — adds a loop on the outside edge instead. The ring has no color of its own — it naturally picks up whatever’s already there (core color through the middle and on top, back background color underneath).

Settings & Export

  • Core color — the piece’s structural middle layer. Defaults to your front’s dominant color, but you can pick any color.
  • Back background color — fills any part of the shape the back artwork doesn’t cover.
  • Print size — sets the longest side of the finished piece, in mm — the keyring hole or ring scales with it.

Click Generate & Download — you’ll get a ZIP with one STL per color. Load them together in your slicer and assign a filament color to each.