One of my first designs. 

A simplified ski pole basket with friction fit. Some glue will bond it even stronger.

Best results with TPU material and 100% infil.

Mine holds few seasons already, but I'm not skiing every weekend :-) 
If it fails, just print a new one.
In case you are wondering - the small hole at the side is to snap it with the other pole.

To customize you'll need OpenSCAD from openscad.org
open the ski_pole_basket.scad file and adjust the parameters to fit your ski pole

if you prefer copy-pasting :-)
 

$fn = 120;
height = 1.6;
outer_diameter = 65;
inner_diameter = 12;
hole_diameter = inner_diameter-0.45;
other_pole_hole_d = 10;

inner_height = 15;
angle = 30;

difference() {
union() {
cylinder(h=height, d=outer_diameter, true);
cylinder(h=inner_height, d1=inner_diameter+inner_height*tan(angle), d2=inner_diameter, true);
};
cylinder(h=inner_height, d=hole_diameter, true);
translate([0.5*(outer_diameter-other_pole_hole_d),0,0]) cylinder(h=inner_height, d=other_pole_hole_d, true);
};