$fn = 60;

include <BOSL2/std.scad>

tube_dia=16;

// new
cuboid([90,150,9], rounding=3) attach(BOT) textured_tile("trunc_diamonds", [80,140], tex_reps=[10,10]/*, style="convex"*/);
translate([0,0,17]) {
    difference() {
        cyl(l=25, d1=80, d2=26, rounding1=-5, rounding2=5);
        zcyl(l=25, d=tube_dia+.5, rounding=-2);
    }
}