To test the accuracy of the gear system, we used a balloon as a substitute for the actual arterial samples and took pictures to find the stretched measurements for every teeth, over six trials. The results are shown below. From these tests, we can see the accuracy of the teeth to achieve the calculated 0.942 mm/tooth stretch is 2.09%. The relative standard deviation, however, is at 11.4%, implying the device's precision is low, in part because of the small measurements that are being taken. This may be a direction in the future to improve on.

Due to the time and budget constraints of the project, our team opted to 3D print our pieces using an SLA printer in the DVJ lab. However, this limited our resolution. Potentially, a future direction is testing using commercially available pieces which can use a smaller gear module for our rack and pinion, and therefore get smaller increments for each gear tooth, which is ideal for working with a vessel of this size. We could also see the potential to use servomotors to stretch the vessel more precisely instead of by the increments limited by the gear teeth, though it would be important to note the risk of damaging electrical parts as it would come into close contact with the vessel, which needs to be kept submerged in a liquid bath.