Keychain Maker

How to make a name keychain

1. Type the name. One line, or press Enter for a second line (a first and last name, or a name and a phone number for a bag tag).
2. Pick a font. Satoshi is built in. Fonts installed on your computer or phone are listed too, so the choice differs between devices. For a script or display font you like, choose "Use your own font file".
3. Choose the plate. "Follows the letters" grows an outline round the text, the classic name keychain look. Rectangle and capsule make a tag shape. Pick where the keyring hole goes, or None for a name sign or desk plate.
4. Check the warnings. The page flags strokes thinner than 0.8 mm and gaps under 0.6 mm, which a 0.4 mm nozzle can't print well.
5. Download. One STL for a single colour, or the base and letters as two STL files for a two-colour print.

How to print it

1. Print it flat, as it comes. The STL is in millimetres with the base on the bed. No supports are needed.
2. Use a 0.2 mm layer height with a 0.4 mm nozzle, or 0.12 to 0.16 mm for small letters. Two or three walls give crisp letter edges.
3. Two colours on one nozzle: print the one-piece STL and add a filament change (colour change or pause) in the slicer's layer preview at the first layer above the height shown under the download buttons, 2.0 mm with the default settings. The base prints in the first colour and the raised letters in the second.
4. Two colours with a multi-material printer: download the base and letters STLs and load them together as parts of one object, so they keep the same position (most slicers offer this when you open several files at once, or let you add a part to an object). Then give each part its own filament. Engraved letters work this way too, as a flush inlay.
5. PLA is the easy choice. For a keychain that lives in a pocket or a hot car, PETG is tougher and softens at a higher temperature.

Keychain sizes

Starting points, not rules. "Letter height" here is the height of a capital letter; lower-case letters are smaller.

A split ring or lanyard clip needs a hole a little wider than its wire or hook; measure it and add about 0.5 mm. Long names grow wide fast: at 12 mm letter height, each letter adds roughly 8 to 11 mm in Satoshi Bold, more or less in other fonts.

What the check means

Before a download button turns on, the page reads each STL back from its own bytes. It checks that the triangle count matches the file, that every edge joins exactly two faces in opposite directions (a closed, manifold solid that slicers accept), that the outer size matches the model, and that the keyring hole stays clear of the letters.