This was a project for a class, MSE 4777, in which the goal was to identify a need in the educational community and try to fix it. My solution is fairly basic but hopefully effective for some. These are 3 basic shapes (Cube, Cylinder, and Sphere) with the equations for volume and area displayed right on it. The required variable are also label on the object so that hopefully students can more easily see where the variables are on a 3D object. I know sometimes I struggled to see in my mind so hopefully this will help some people. 

As for the design it was made mainly using Blender since it was just a few basic shapes peiced together and that is what I am currently trying to learn more of so I wanted more practice with it. The design should be very easy to print and shouldn't necessairly need support. Though I would caution you to check before you print some because there may be some over hanging letters on the object. Also I would ensure the object is scaled down to your desired size before printing as, for example, the "cube educational aid" is something like 300mm across and you probably don't need it that large. This made it easier for adding 3D writing and not having an issue when downscaling. Depending on the size and density of your print the cost should be around $1 or less (see my printer setup below). This configuration resulted in good prints and in a reasonable time and cost. 

My printer setup is as follows:

Layer Height - 0.2/0.3 mm

Density - 10%

Infill - grid

Wall Thickness - 1 mm

Top/Bottom Thickness - 1 mm 

Support - none

*Note: I found the original idea for this from HUNGERLEOOFF on cults3d found here(https://cults3d.com/en/3d-model/game/formules-pour-calculer-des-volumes)