The Abacus consists of:
- top bar (Shell_T)
- central bar (Shell_C)
- lower bar (Shell_B)
- left (Shell_L) and right (Shell_R) bars
- counting beads - two upper (Bead_t2) and eight lower (Bead_t1).
After printing you have to glue bead halfs together.
You also need two studs 2x75 mm. Initially I tried to print them but then decided to use 2 mm steel. It can be made both from steel whire, plastic and wood. I prefer steel :)
All the joints are adjusted for 3D printing.
This abacus parts can be easily assembled/disassembled and sections can be stacked together.
FD Plast PLA
Why the abacus is so complex
The Abacus is useful for teaching children counting. This one is specially designed in the form of a designer/constructor. As you study counting, you can add sections at the left and at the right (may be in a different colors).
When simple math operations are studied using abacus, multi-bit (18 positions for example) abacuses are suitable. But when divisions and fractions begins children faces with difficulties - they have become accustomed to the fact that the rightmost digit is one and it’s difficult for them to understand, that something happens to the "right".
Upper beads have 5 corners - for visually impaired children.
So this abacus is not only a compact funny toy but also a useful tool for mental arithmetic study