I sketched, first determining the size to ensure the volume is enough to hold 100mL of liquid. Initially, I prioritized the convenience of using the final product, so I sketched a plan with a low gravity structure, the bottom will be spherical and beveled towards the tip.

This plan is a bit difficult to recycle, manufacturing by 3D printing in space may require a support structure to fix it, this is the part that can be wasted after 3D printing is completed. Therefore, this plan is not good.

To make it easier to 3D print while consuming less support material, a simpler structure is needed, and when recycling, there are several ways to recycle, I chose to turn them back into plastic filaments for 3D printing for the next time, I can take advantage of the 3D printer's thermal head, a few simple cutting operations without additional tools or additional steps. So I thought of a flat rectangular or cylindrical structure that would be easy to cut into strips and then pass through a heat head to become a filament for 3D printing.

Below are sketches of these two options, figure 1 is the rectangular recycling option, figure 2 is the elliptical cylinder.

Figure 1

Figure 2