Being disabled should not mean being disadvantaged, and no one should be left behind as technology progresses. Losing an arm or the use of a hand today could make using a smartphone difficult. This strap-on arm allows one-handed phone operation as part of the #AssistiveTech challenge.

Parts needed:

• Print one of each file (files labelled “b”, e.g. 1b and 4b are options). Refer to attached “Parts Catalog” screen shot.
• 8 x M3*12mm screws
• 2 x M3*6mm OR 8mm screws
• 1 x M4*30mm bolt & nut
• 4 x short self-tapping screws
• 1 x 1/2” electrical trunking
• 2 rubber bands
• 1 x M5*40mm bolt & nut
• 1 x M5*60mm bolt & nut
• 1 x length of 10mm strap

Assembly:

1. Run strap through Base unit loops. Secure ends with dead knots (I might add a self-locking clip later)
2. Mount Base Socket to Base unit, using 4 M3*12mm screws. Note, these are designed to enter at an angle toward the underside of the socket.
3. Insert Ball Joint.
4. Install M4*30mm bolt through Lock Handle, fasten with the nut. Screw it into the Socket base
5. Connect Phone Assembly Connector to the Phone Assembly Swivel with a M5*40mm bolt and nut. Fasten to provide some resistance.
6. Add Phone Holder Base to that assembly with M5*60mm bolt and nut. Fasten to provide some resistance.
7. Install Phone Back Support using 2 M3*6mm or 8mm screws.
8. Slot both Phone Grips through assembly. Install 4 M3*12mm screws to all four ends - Do not install fully, the protrusion acts as a brake and to loop the rubber bands (next step).
9. Connect the opposite ends of both Phone Grips with a rubber band each, double loop if required to provide good resistance when both grips are pulled apart. These hold the phone in place.
10. Measure a length of electrical trunking to connect both Base and Phone assemblies. This simulates a forearm. Cut TWO same lengths. Secure in the hexagon ports with self-tapping screws.
11. Wear the whole unit, adjust to a comfortable viewing angle, lock the arm with the Lock Handle. Install phone.

Video here: https://youtu.be/gigb-_6cvnM

** Credit to FunbieStudios for ball & socket joint. http://www.thingiverse.com/thing:70366