OSAT 3D Printed Finger Splint

• nonparametric
• openscad doesnt render design as posted
• suboptimal printing orientation and design

This is a 3D printed finger splint used for immobilizing fingers to facilitate healing. Within the medical field, studies have been found that 3D printed casts or braces allow a patient to heal faster compared to conventional braces. They are designed with a more aesthetically pleasing look while allowing the wounded limb to breathe and heal faster by not covering the entirety of the limb.

Bill of Materials

1. 1.75mm PLA Plastic Filament. Full roll - $23.00. Length required for print - $1.50
   1. All Files located here: https://www.youmagine.com/designs/3d-finger-brace

Tools needed

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

Skills and knowledge needed

Understanding of OpenScad

Technical Specifications and Assembly Instructions

1. Open (or install and then open) Cura
2. Select File -> Load Model File. Open closed_brace.stl and the model should appear on Cura
3. The initial model file will appear, but the scale will need to be altered in order for the finger to fit. It is recommended to use a set of calipers to obtain the measurements on the finger.
4. Click on the model, and then click Scale. Set Size Z(mm) to the thickness of the finger.
5. Unlock Uniform Scale. Set Size X (mm) to the length of the finger.

Once the scaling settings are set, under the basic tab, change the following

1. Layer Height (mm): 0.25
2. Shell Thickness (mm): 1.0
3. Fill Density (%): 90
4. Print Speed (m/s): 65

Under the advanced tab, change the following

1. Initial Layer Thickness (mm): 0.25

The expected time to print will range between 45 to 65 minutes, depending on the brace size for the finger. Since this is one part, there is no assembly required

Common Problems and Solutions

One common problem will be the length of the brace. If the finger has too much of a gap once the brace is on, the best way will be to scale down the X width in Cura. Ensure that Uniform Scaling is deselected and scale down the X width to accommodate the proper length for your finger.

Cost savings

1. Price for Plastic - $1.50
2. Commercial Splints - $8.00 low end to $25.00 higher end
3. Low End Savings: $6.50 (82% savings) High End Savings: $23.50 (94% savings)

References