When we were initially still on the design that required syringes, we had to measure the length of it so as to customise the 3D prints. As we did not have any measuring device, we tried to use a measuring application on an iPhone – which was not accurate at all. As a result, we had many 3D printings of the wrong size and dimensions. We could have saved more plastic used for 3D printing. This is how NOT to do it: