Count the number of geometric solid illustrations you would like to place on the poster. Divide the illustrations into multiple groups of equal number. For example, a collection of 18 illustrations can be divided into 6 groups of 3 illustrations or 9 groups of 2 illustrations, etc. It is better to have the number of groups to be nearly the same as the number of illustrations, so 6 groups of 3 illustrations is better than 9 groups of 2 illustrations for this application.
Add 1 to both the number of groups and number of illustrations. This is the number of regions you will draw on the poster as rows and columns. For example, the 6 groups of 3 illustrations will be laid out in a grid of 7 rows of 4 columns or 4 rows of 7 columns.
Open the image editing software and define a paper size for your poster. Paper is based on the 8-1/2 inch by 11 inch module in the American National Standards Institute (ANSI) system. So, your poster can be: ANSI A, 8-1/2 inches-by-11 inches; ANSI B, 11 inches-by-17 inches; ANSI C, 17 inches-by-22 inches; ANSI D, 22 inches-by-34 inches; or ANSI E, 34 inches by 44 inches.
Draw a header at the top of the poster. The header should be around 4 inches tall for ANSI A and ANSI B paper or 6 inches tall for any other size paper. The header should extend the length of the sheet. Provide a title in the header and adjust the colors to taste. The text should be approximately 2 inches shorter than the header height and placed in the center of the header field.
Draw a footer at the bottom of the poster. The footer should be 1 inch for ANSI A and ANSI B paper or 2-to-3 inches for any other size paper. Like the header, the footer will extend the length of the sheet. Place supporting text in the footer or leave the footer blank for visual relief.
Divide the remainder of the sheet into a grid of equal rectangles. Use the grid defined in Step 2. For example, an ANSI D-sized sheet, oriented vertically will have a space remaining that is 26 inches tall and 22 inches wide. Using the 7-by-4 grid established in Step 2 yields seven 3-5/8 inch high rows and four 5-1/2 inch columns.
Scan the geometric solid illustrations and place the images on the grid line intersections, leaving a gap between the illustrations and the poster header, footer, and edges. In the example, the 7-by-4 grid provides 18 grid line intersections to place the 18 illustrations.
Adjust the illustration placement. You may prefer to push the outer illustrations closer to the centerline of the poster to provide a wider gap between the illustrations and the poster header, footer, and edges.
Print the poster as a PDF file. Most contemporary computers provide a PDF printer; however, you can download or purchase a PDF creator as well.
Send the PDF to a printing company. There are many print companies online, but you can also use the printing services provided at FedEx Office, UPS Store, Staples, Office Depot, or Office Max.