Pen Holder

Pen holder for 1, 7, 19, 37 or 61 pens.
OpenSCAD file (.scad) for custom changes is attached.
You can change cylinder radius, wall thickness, height of the base, and more. The shape of a single element can be straight or be created by a Bezier curve.

This thing is inspired by "48 Art Pencil Holder" by Gizmoticist: https://www.thingiverse.com/thing:316755

Recommendations for printing:
no support, no raft, layer height: 0.2, line width: 0.4, wall thickness: 0.8.

In my models:
faces= // from [6,12,18,24,...] ; single cylinder resolution
count_z= // [0,1,2,3,4] ; zone number (from center to external cylinder)
radius=8; // single cylinder external radius
thickness=0.8; // wall & bottom thickness
count=3 count_z (count_z+1); // [0,6,18,36,60] ; count+1 = number of cylinders
distance=cos(180/faces) * (2radius-thickness); // between centers of cylinders

Thickness_of_wall = cos(180/faces) * thickness
Inside_hole_dimension = 2 cos(180/faces) (radius-thickness)

Inside_hole_dimension (for radius=8 and thickness=0.8):
12.47 for faces=6
13.91 for faces=12
14.18 for faces=18
14.28 for faces=24
14.32 for faces=30
14.37 for faces=48
...
Inside_hole_dimension should be greater than pen diameter.