Morse code reference card (A-Z, 0-9), raised dots and dashes

A pocket-size Morse code reference card with all 26 letters and 10 numbers. The dots and dashes are raised, so you can see them and feel them.

Handy for scouts, classrooms, escape rooms, new ham radio operators, or anyone learning Morse who wants a chart that survives being in a bag.

Print settings

• Size: 115 x 78 mm, 2.2 mm thick

• Layer height: 0.2 mm (0.12 mm if you want crisper letters)

• Nozzle: 0.4 mm

• Infill: 100% (it is thin)

• Supports: none, print flat

• Two colours (optional): add a filament change at 1.6 mm so the letters and symbols stand out from the card

How to read the card

Dots are round bumps, dashes are long bars. A dash is three times as long as a dot, the same ratio used when sending Morse.

When you send or listen:

• a dot is 1 unit, a dash is 3 units

• the gap inside a letter is 1 unit

• the gap between letters is 3 units

• the gap between words is 7 units

Customise it

The OpenSCAD source is included. You can change the card size, thickness, relief height, row spacing and font at the top of the file. If you add letters or punctuation, add them to the letters list as ["?", "..--.."].

Practise with it

The card tells you what each letter looks like. To learn what they sound like, pair it with a few minutes of listening practice a day:

• Learn Morse code: a free Koch method trainer that adds one letter at a time

• Morse code translator: type anything and hear it as sound, light or vibration

• Printable chart: a paper version for the wall

The image is a digital render. This model has not been physically test-printed.