Magnetic Number Line

I designed these number lines to help our son with his math worksheets.  Each line is numbered from 0 to 100 and is comprised of 5 or 10 sections (“By 20s” or “By 10s”, respectively) joined by magnets.

Required Non-Printed Materials

• (8) or (18) rectangular rare earth magnets, 20 x 5 x 2mm

Assembly.  Glue a magnet in the recesses at the ends of each section.  Be sure to orient each magnet so that the magnet on any section‘s right end will be attracted to the magnet on any other section‘s left end.  I used 2-part, 5-minute epoxy for the gluing.

File options.  In the 3MF files, each numeral is a separate part that can be colored differently.  I have also included STL files in which each section is a single body with the numerals fused to the main body, for those who prefer to paint the colors.