x_size = 75;
y_size = 40;
z_size = 6;
wall_size = 1;
hole_rad = 2;
filament_x = 10;
filament_size = 2;

union()
{
	difference()
	{
		// Main
		cube([x_size, y_size, z_size], center = true);

		// Hollow
		translate([0, 0, wall_size])
		{
			cube([x_size - 2 * wall_size, y_size - 2 * wall_size, z_size], center = true);
		}

		// Fillament Hole
		translate([filament_x, 0, wall_size])
		{
			cube([filament_size, y_size + 1, z_size], center = true);
		}
	}

	// Hole Mounts
	for (i = [-1:1:1])
	{
		translate([i * 32, ((i == 0) ? 1 : 0) * 29 - 14.5, 0])
		{
			difference()
			{
				cylinder(z_size - 1, hole_rad + 1, hole_rad + 1, $fn = 360, center = true);
				translate([0, 0, wall_size])
				{
					cylinder(z_size - 1, hole_rad, hole_rad, $fn = 360, center = true);
				}
			}
		}
	}

	// Bearing Mount
	translate([3, 0, 0])
	{
		cylinder(z_size, 2, 2, $fn = 360, center = true);
	}

	// Left Walls for fillament
	for (i = [-1:2:1])
	{
		translate([filament_x + i * ((filament_size + wall_size) / 2), 0, 0])
		{
			difference()
			{
				cube([wall_size, y_size, z_size - 1], center = true);
				cube([wall_size + 1, 5.625 + i * 0.875, z_size], center = true);
			}
		}
	}
}