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<strong>Step 10:</strong> Zoom into the bottom of the egg and perform the same operation on the intersection between the spline and the 6mm line. Again, the goal is to make the spline approximately horizontal where it connects with the 6mm line to maintain the continuity of the curve. As you manipulate the spline, you might like to click on the Show Curvature checkbox in the left column to see a visual representation of the intensity of the spline's curve at each point. Change the curvature scale and density to taste.

<strong>Step 10:</strong> Zoom into the bottom of the egg and perform the same operation on the connection between the spline and the 6mm line. Again, the goal is to make the spline approximately horizontal where it connects with the 6mm line to maintain the continuity of the curve. As you manipulate the spline, you might like to click on the Show Curvature checkbox in the left column to see a visual representation of the intensity of the spline's curve at each point. Change the curvature scale and density to taste.

[[File:Egg 10.png|1500px|none]]

[[File:Egg 10.png|1500px|none]]

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<strong>Step 11:</strong> One you are happy with the shape of your spline, you can deselect Show Curvature. Select the spline and click on Offset Entities. Set the distance to 3mm; this is defining the wall thickness of your egg. Make sure the new offset curve is on the inside of your spline. Toggle the Reverse checkbox to switch the offset curve between inside and outside.

<strong>Step 11:</strong> Once you are happy with the shape of your spline, you can deselect Show Curvature. Select the spline and click on Offset Entities. Set the distance to 3mm; this is defining the wall thickness of your egg. Make sure the new offset curve is on the inside of your spline. Toggle the Reverse checkbox to switch the offset curve between inside and outside.

[[File:Egg 11.png|1500px|none]]

[[File:Egg 11.png|1500px|none]]

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<strong>Step 13:</strong> Arbitrarily, draw a diagonal line from the point shown in the first screenshot below and set the length to 40mm long using the Smart Dimension tool. Notice that when you click elsewhere to deselect the line you just drew, it doesn't turn black like the rest of the lines in your sketch. This is because the line is "Under Defined," which is also indicated at the bottom of the SolidWorks screen. To fully define this line, click on the diagonal line and the vertical 72mm construction line using the Smart Dimension tool to set the angle to 45 degrees. The result should look similar to the second screenshot below.

<strong>Step 13:</strong> Arbitrarily, draw a diagonal line from the point shown in the first screenshot below and set the length to 40mm long using the Smart Dimension tool. Notice that when you click elsewhere to deselect the line you just drew, it doesn't turn black like the rest of the lines in your sketch. This is because the line is "Under Defined," which is also indicated at the bottom of the SolidWorks screen. To fully define this line, click on the diagonal line and the vertical 72mm construction line using the Smart Dimension tool to set the angle to 45 degrees. The result should look similar to the second screenshot below. Why is this diagonal line necessary? Well, we don't want any supports printed inside of the egg because that would impede the beads/pellets from moving freely to create the egg shaker's signature "shaking" sound. 3D printers don't do a great job printing over thin air with no supporting material underneath. However, most 3D printers can handle a 45 degree incline quite well, and this diagonal line ensures that no surface on the top half of the egg is shallower than 45 degrees with respect to the build plate. This 45 degree line will turn into a cone shape later on. Geometry is one of the most important factors that affects the likelihood of a successful print, and for this particular project, the top part of the egg will present the greatest risk of causing the print to fail.

[[File:Egg 13.1.png|1500px|none]]

[[File:Egg 13.1.png|1500px|none]]

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<strong>Step 14:</strong> Use the Trim Entities tool to get rid of two parts of the diagonal line and part of the offset curve to create the shape shown in the screenshot below. The Trim Entities tool functions by clicking and dragging a line across the parts that you want to disappear. The resultant shape should turn grey to indicate that it is a closed area.

<strong>Step 14:</strong> Use the Trim Entities tool to get rid of two parts of the diagonal line and part of the offset curve to achieve the shape shown in the screenshot below. The Trim Entities tool functions by clicking and dragging a line across the parts that you want to disappear. The resultant shape should turn grey to indicate that it is a closed area.

[[File:Egg 14.png|1500px|none]]

[[File:Egg 14.png|1500px|none]]

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<strong>Step 15:</strong>

<strong>Step 15:</strong> Now the fun part begins because we are moving from 2D to 3D. In the top left corner, click Exit Sketch (your sketch should turn light grey). Click on the Features tab and select the Revolved Boss/Base option. SolidWorks may ask you to select a plane to perform this revolve in; click on the 72mm line as the axis of revolution. Usually SolidWorks will figure out the rest of the revolve, but you may have to select the correct contours to get the desired result. Click the green checkmark in the left column if everything looks good. If the revolve function gives you an error, you may have to go back into your sketch and fix something.