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.