Mobilization Wedge

This is a mobilization wedge used by physical therapists to perform manual spinal mobilization techniques and other various exercises. The tool size is 2" X 7" X 4". This tool is normally $34.99. A conservative estimate for the price of PLA is $20/kg. 3D print cost is approximately $3.60. I created this tool using FreeCAD. The FreeCAD and stl files are attached.

Bill of Materials

1. In order to print this device, approximately 180 grams of PLA is needed.
   1. All CAD and STL files can be found on YouMagine from the following link: [1]

Tools needed

1. MOST Delta RepRap or similar RepRap 3-D printer

Skills and knowledge needed

• No special skills are needed to print this design.

Technical Specifications and Assembly Instructions

1. There are no assembly instructions. This is a one piece print and it does not require the use of supports when printing. The print however does need to withstand the weight of a person. For that reason, an infill of at least 25% is recommended.
2. A conservative print time estimate is 9 hours.
3. There is no assembly time.

Common Problems and Solutions

• A common problem would be printing with too small of an infill percentage and the part not being strong enough.

Cost savings

1. This tool is normally $34.99. A conservative estimate for the price of PLA is $20/kg. The print is estimated at 180 grams. 3D print cost is approximately $3.60.
2. A commercial equivalent product can be found at the following link: [2]
3. The cost savings is $31.39 per unit. This is a 90% cost savings.

Benefited Internet Communities

• Doctors without Borders [3]
• Physical Therapist Forum - WebPT [4]
• Physical Therapist Forum - The Student Doctor Network [5]
• UNICEF [6]
• Oxfam [7]

References

• All of the information for this design and the use of this design came from discussing it with practicing Doctors of Physical Therapy.