Telescopic Under-Saddle Bicycle Fender — Mechanical Design for FDM Printing Ended

I need a freelance mechanical designer to create a retractable, telescopic rear fender that mounts under a road/gravel bike saddle. The reference style is the "Beatail" fender a compact aerodynamic shell that extends into a full fender and retracts when not in use.
Mechanical requirements:

4–5 nested telescopic segments that slide in and out
Locking mechanism (friction stop or snap-fit) so segments stay extended during riding
Built in stop features so segments cannot fully separate after printing
Fully retracts under the saddle when closed

Mounting:

Clamp system for standard 7mm saddle rails
M3 or M4 fastener seats
Tilt adjustment for different saddle/frame geometries

FDM optimization:

Designed for 0.2–0.3mm print tolerances
1.5–2.5mm wall thickness
Material assumption: PETG, ASA, or CF-PETG
Print orientation should minimize supports; layer lines perpendicular to flex direction

Aesthetics:

Sharp, modern, aerodynamic lines
Customizable logo area on the outer segment
Matte surface finish

Deliverables:

Editable source files (Fusion 360 .f3d or .step)
Print-ready .stl and .3mf files
Exploded view or short assembly guide

I have a full technical brief (PDF) I'll share with the selected designer or shortlisted candidates.

Skills Required:

Fusion 360 (SolidWorks)
Mechanical Design
Design for Additive Manufacturing (DfAM)
Assembly Design
3D Printing knowledge read less