3D printers

Grader A: hit

MakerBot alone reported 7,000+ printers in US K-12 classrooms by about 2019 (US has ~130k K-12 schools, so 5% is ~6,500), plus other vendors and makerspace programs; Y Soft 2017 survey shows wide but restricted educational use. Crosses 5% plausibly but not directly measured as a school share.

Test: at least 5% of US K-12 schools had a 3D printer in use by 2020

• MakerBot expands educational ecosystem with 3D printing certification program for students (2019): Over 7,000 MakerBot printers installed in US K-12 classrooms
• Y Soft's International Education Survey Finds That Majority of Schools Limit Student Access to 3D Printing (2017-01): 3D printing in use across schools; 23% of educators introduce it in elementary; 87% restrict student access

Grader B: hit

2017 industry survey: 23% of respondents reported 3D printing used at K-12 schools; maker-space adoption grew to 2020. Sample is not a probability survey, but the share is well above 5%.

Test: At least 5% of K-12 schools used them by 2020.

• New survey says 3D printing still dramatically underutilized in education (2017-01-26): 23% of respondents said 3D printing was used at K-12 schools
• 3D printing, STEAM are on the rise in classrooms (2020-11-10): Survey of educators using 3D printing in classrooms