This is one of a series of educational displays I made for the Arcade Library in Sacramento to help teach people about 3D printing.
It can be difficult to explain important 3D printing concepts like infill percentage, shells, resolution, and the need for supports.
Sometimes all you need is a visual aid to make things click.
This is a infill display that shows the effect of different infill percent settings. A one inch cube is printed fifteen times with various settings. Cubes with 0-20 percent infill are on the first row and then 25-50% infill are on the next row followed by 60-100% on the top row. It is easy to see how the infill percentage effects a print.
See the instructions for details on how to make this display for your classroom, or anywhere else it will be useful.
I've also included the SketchUp files if you would like to make changes.
See the shell display in this photo here: http://www.thingiverse.com/thing:927684
Start by printing out the "25mm cube.stl" with the following settings: 0.3mm layer height, 2 shells and 0% infill. Cancel the print before the printer finishes printing the top of the cube so you can see the infill inside of the cube.
Repeat the cube print 14 more times changing the infill percent to 5% 10% 15% 20% 25% 30% 35% 40% 50% 60% 70% 80% 90% 100%
Use the first cube you printed to judge when to stop the next prints so the cubes are all the same height.
Tip: you can print the middle and last row of cubes shorter (cancel them sooner so they are not as tall) because they take much longer to print with such a high infill percentage.
The next step is printing "20.stl" and "50.stl" and "100.stl"
I used the settings 5% infill and 2 shells and 0.3mm layer height.
Pick two colors, one for the letters and one for the background of the letters. Load the filament of your choice for the background of the letters and start the print. When the printer has finished the last layer of the rectangular part of the label and starts the the first layer of the letters go to "change filament" in the menu of your 3D printer. Then proceed to unload the filament you were printing with, and load the filament you have chosen for the letters. Then continue the print.
Do these steps for all three files. I would not recommend printing all of the files at once in case you make a mistake and have to start over.
Repeat the same steps for "Percent Infill Label.stl" that goes on the front of the display stand.
Print the "Infill Display Stand.stl" file in the color filament of your choosing.
The settings I used were 0.3mm layer height, 2 shells and 5% infill.
Finally glue everything together.
The glue I used is "Model & Hobby Cement" from the dollar store. It's strong but not so strong that you cannot get it apart if you make a mistake.
Enjoy! Teach and spread the knowledge of 3D printing!
EDIT: It has been brought to my attention that there is a setting called "top layer height" in the advanced settings of MakerWare and Cura. Setting this to 0 will print the block without the top automatically, so you won't need to cancel the print manually to leave it open so you can see the infill.