$fn=64;

// --- Parameters ---
jar_diameter = 120;        // Inner diameter to fit the treat jar
wall_thickness = 4;        // Thickness of the holder walls
base_thickness = 5;        // Thickness of the solid base
holder_height = 90;        // Total height of the holder
front_cutout_width = 75;   // Width of the front slot for easy gripping/viewing
front_cutout_z = 45;       // Height from the bottom where the front slot begins
suction_hole_radius = 12;  // Hole in the base to prevent vacuum when removing jar

// --- Calculated Variables ---
outer_radius = (jar_diameter / 2) + wall_thickness;
inner_radius = jar_diameter / 2;

// --- Geometry ---
difference() {
    // Main outer body
    cylinder(r=outer_radius, h=holder_height);

    // Inner hollow for the jar
    translate([0, 0, base_thickness])
        cylinder(r=inner_radius, h=holder_height + 1);

    // Anti-suction hole in the bottom base
    translate([0, 0, -1])
        cylinder(r=suction_hole_radius, h=base_thickness + 2);

    // Front access and viewing slot
    translate([0, 0, front_cutout_z]) {
        // Rounded bottom of the slot
        rotate([-90, 0, 0])
            cylinder(r=front_cutout_width/2, h=outer_radius + 2);
        
        // Straight vertical cutout for the slot
        translate([-front_cutout_width/2, 0, 0])
            cube([front_cutout_width, outer_radius + 2, holder_height]);
    }
}