The STEAM by Design class in the Middle School saw a problem with the amount of Germ Attack Hand Sanitizer dispensed when users pressed the pump too far down. After researching how much sanitizer should is needed to ensure adequate disinfection, we determined the average amount should be 2.4 mL – 3.0 mL. Two sites we used are https://www.cdc.gov/handwashing/show-me-the-science-hand-sanitizer.html and https://pubmed.ncbi.nlm.nih.gov/18538702/.
We tested different sized Sani Savrs and settled on sizes in the 55 – 60 mm as these models will dispense approximately 2.4 to 3.4 mL. Considering that not all hands are the same size, we recommend using a 55mm for larger hands and a 60mm for smaller hands.
Dispensed Amount Calculations and Possible Savings
|Amount Dispensed mL*||# of Squirts per Bottle*||Increase in # of Squirts*||Savings Per Jug*|
|No Sani Savr||23.3mL||162||0||$0.00|
STEAM by Design Sani Savr Ad
That’s great! A great problem solved with 3D printing. Now you save money and sanitizer. A great example of the benefits of 3D printing.
I agree Parker. Are there other problems that need a solution?