2 by 4 CAD Building Block
Steps:
Log into onshape and create a new document by clicking create and then document on the left side of the screen.
In the top-right corner click on your name, go to "my account", then "preferences", and set the length default unit to millimeters. Then save the changes and return to your document.
Press "top" on the cube in the top-right corner so that it zooms over the top plane.
Press "sketch" in the top left corner and select the outer edge of the top plane so that is says that the top plain is the sketch plane.
In the top left corner there is a tool that looks like a rectangle with circles in the top-right corner and the bottom-left corner. When it is hovered over it says, "corner rectangle". Click on that button and draw a square on the plane starting at the origin. The measurements of the square do not matter yet.
6. Click the button that is second from the right that says "dimensions" when hovered over and click on one of the line. Drag away from the square and click again. Input the value as 15.6mm. Click on a perpendicular line and input the value 31.2mm.
7. Click the green check mark in the little window.
8. Press the button to the right of the "sketch" button that says "extrude". Then click on the square.
9. Change the depth value to 9.6mm and press the green check mark.
10. Press the third from the right button that says plane. Then press on the square. Then change the offset distance to 0mm.
11. Press the green check mark.
12. Press the sketch button and select the outer edge of the new plane (plane 1).
13. Press the tool to the left of the rectangle making tool that says, "line" when hovered over.
14. Create lines that cut the rectangle in half both ways.
15. Create two more lines between the horizontal center line and the outer lines. Use the dimension tool to make sure that they are in the center. You can do this by clicking on two lines and inputting the distance you want between them.
16. Add two more lines to each of the vertical halves to create four vertical sections. Then create four more lines and split each of those sections in half so that there are eight vertical sections. This should create 32 evenly-sized boxes in the rectangle.
17. Click on each of the lines and then click on the tool about halfway across the toolbar that says "construction" when hovered over.
18. Using the circle tool, which is to the right of the rectangle-making tool, create eight circles in the intersections from the lines, in accordance to the image below.
19. Use the dimension tool and select the circumference of the circle and then input 4.8mm as the diameter size.
20. Press the green check mark.
21. Click the "extrude" button and select all the circles.
22. Input a depth of 1.7mm and press the green check mark.
23. Rotate to the bottom orientation and create another sketch on the bottom plane.
24. Select the button to the left of the construction tool that says, "project/convert". Then select the circles that were created before to project matching circles.
25. Click the green check mark.
26. Click the extrude button and select all of the circles.
27. Switch to the remove tab and input the depth as 1.7mm. Then select the "opposite direction" button to reverse the direction of the extrusion, if needed.
28. Press the green check mark.
29. If you would like to change the color, you can right-click "Part 1" on the left side and select "edit appearance" then you can select the color you would like.
30. To hide the planes and the origin you can press the eyes on the left side of the screen and it will hide those components.
