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The APH Museum is open for tours. We are following the CDC’s recommendation and require face masks to be worn at all times for guests aged 3+.


Current Product Testing Opportunities

  • APH is seeking teachers to test an iOS and Android app called “Practice2Master Abacus.” The app is designed to help elementary school students with visual impairments learn how to use an abacus. With this app, students can take lessons covering addition, subtraction, multiplication, and division; practice their skills with an unlimited number of problems; get problem-specific assistance; take drills; and report back to their teachers.

    Testing will begin in fall 2021. If you have an iOS or Android device and are interested in testing this app with your elementary school students, please, fill out this APH Field Testing Application Form. Should you have any questions, contact us at

    Thank you for your time and consideration!

  • Group of four photos showing the two variations of 3D printed cartridge holders and how their pieces assemble to hold a cartridge.

    The purpose of the cartridge holder is to allow individuals with spastic cerebral palsy who often develop involuntary muscle contractions (spasticity), which may affect hand function such as clenched hands or fingers contracted in unnatural positions, to easily insert and remove a DTB cartridge when using APH’s Joy Player.

    The reason for field-testing the cartridge holder is to determine if the STL and 3MF files as drawn print consistently when using different filaments and resins and different 3-D printer brands and models.

    We have two variations to test: slide-closure holder and screw-closure holder. Upon printing the device, field testers will send the 3-D printed holders to APH for evaluation. Participants will be paid a small stipend to compensate for materials, labor, and shipping.


    Consider the following if interested in participating:

    • APH 3-D printed the cartridge holders with an FDM printer using a single extruder with no support material. APH’s printer uses a heated build plate, but our prints shown in the photos were done in PLA filament which does not require a heated build plate when not available.
    • We recommend the following settings for an FDM printer:
      • Nozzle diameter .4mm
      • Layer height .1mm
      • Infill for main bodies of cartridge holder, 40% infill.
      • Infill for printed screws when applicable, 100% infill.
    • When using a single extruder FDM printer without support material, screws should be printed head side up using the “Brim” setting for best print bed adhesion. The main body of the cartridge holder should be printed bottom side down when using a single extruder FDM printer.
    • It is not recommended to leave finished prints in a hot area such as a hot car or sunny window as warping and deformation may occur.
    • APH found these settings to be successful for both PLA and ABS filament. However, ABS filament would require a heated build plate.

    While we have designed these models to be printable using a single extruder FDM printer without support material, the most widely available cost-effective form of 3-D printer, we are also interested to hear of your results using any other available 3-D printer machine types. Each field tester will complete a short field-test survey.

    If you are interested in participating in the 3-D printing field test, please, fill out this four-question survey. If you have any questions, email