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Figure 7. Slider in wood Figure 8. Slider in PLA PLA. Figure 9. Slider in aluminum.
Several changes were made to the slide rail to improve smoothness of motion, such as printing in ABS rather than PLA, increasing the infill of the printed part to prevent indentation of the rail, and increasing the resolution of the conversion to SLS file in the printed part to increase smoothness of motion. These changes all helped, but none of the above designs allowed sufficiently smooth motion when force was applied at an angle not parallel to the direction of the rail, as happens when the slider is used in the brace mechanism.
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Parts for the attachment of the mechanism to the upper and lower arm were constructed using 3d printed PLA and ABS. Foam padding was added to the undersides of the plastic to increase comfort for the wearer. Velcro straps were threaded through holes in the plastic parts for attaching them to the arm. During testing it was found that there was too much movement of the lower piece when the mechanism was used. To correct for this movement and add stability in the mechanism a handle was added to the lower arm piece, shown in Figure 14. The final product is shown in Figure X, with a complete parts list found in the table in Figure X 15
Figure 13. Arm attachment straps, upper arm. Figure 14. Lower arm piece with handle. Figure 15. Complete prototype.