I need assistance designing three structural models on Fusion $360($bamboo$-$inspired, bone$-$inspired, and a control cylinder$)$ for a mechanics project. These models will be tested under compression to compare their load$-$bearing capacity, energy absorption$,$ and failure modes. Here are the specific details and requirements for each design:

General Requirements:

External Dimensions:

All models must have the same outer dimensions: height $=15$ cm$,$ diameter $=5$ cm$.$

Material Volume:

Ensure each design uses approximately the same material volume $($e$.$g$.,$ relative density $=30\%$ of the total volume$).$ If you have any other ideas for ensuring that the test is fair between the three samples, you can employ it and note it$!$

File Format:

Provide the designs as STL files compatible with $3$D printing or a step by step instruction process.

Design Specifications:

$1.$ Control Cylinder:

A simple hollow cylinder with:

Wall Thickness: $2$ mm$.$ Inner Diameter: $4\mathrm{.}6$ cm $($to maintain the outer diameter and wall thickness$).$

No additional features or internal structures.

$2.$ Bamboo$-$Inspired Design:

A hollow cylindrical structure with reinforcing nodes along its height:

Outer Diameter: $5$ cm$.$ Wall Thickness: $2$ mm$.$ Node Spacing: Nodes placed every $3$ cm along the height. Node Thickness: $4$ mm $($slightly thicker than the walls$).$

Ensure the structure is symmetrical and uses the same material volume as the other designs.

$3.$ Bone$-$Inspired Design:

A trabecular lattice structure enclosed within a thin outer shell:

Outer Diameter: $5$ cm$.$ Shell Thickness: $1$ mm$.$ Trabecular Structure:

Irregular lattice$-$like struts inside, inspired by trabecular bone. Strut thickness: $1\mathrm{.}5$ mm$.$ Strut spacing: Approximately $1$ cm between connections.

Use Fusion $360$s Lattice Tool or similar to create the trabecular structure.

Ensure the total material volume matches the other designs.

Additional Notes:

The models will be tested under compression using an Instron machine.

Focus on maintaining symmetry and material distribution to ensure fair comparisons.

If adjustments are needed to meet the material volume requirement, prioritize wall thickness and node$/$strut spacing.