Double helix spiral staircase. Scala a chiocciola doppia elica

Compose your spiral staircase with as many steps as you prefer to give an idea of ​​completeness the ideal number is 14 steps for sectorThis measures 5x5 cmWith surpluses 55x55 cmThe step sizeZ 4 mmX 25 mmY 16 mmWith your slicer you will ...