Mill project

Project Overview
I need CAD design for the following an adjustable roller stations mounted on parallel rails. All parts should be suitable for 3D printing (FDM).
Deliverables: Fusion 360 source files + STL exports for all components

Assembly Overview
Two parallel rails hold sliding struts. Each strut pair supports a roller pin with a roller mounted on it. The struts can be repositioned along the rails to adjust spacing between rollers. A chain drive connects gears on the roller pins.

Component Specifications
Rails (x2)

Length: 300mm
Profile: Channel with lip (see sketch)
Spacing: 80mm apart (parallel)
Note: Struts slide along rail and friction fit against lip

Struts (x10 — 5 pairs)

Height: 150mm
Top: Hole for 608zz bearing (22mm OD, 8mm ID, 7mm thick)
Base: Tapered/angled to run against rail lip
Fit: Friction fit, adjustable position along rail

Roller Pins (x5)

Length: ~90-95mm (to span 80mm gap plus bearing seats)
Middle section: 8mm square profile (roller mounts here)
Ends: 8mm diameter round (sits in 608zz bearings)
One end: Mount for #25 chain sprocket/gear

Rollers (x5)

Inner hole: 8mm square (locks onto roller pin, rotates with it)
Outer diameter: 60-70mm
Width: 20-30mm

Base Plate (x1)

Holds the two rails parallel at 80mm spacing
Provides stability on desk surface
Simple flat plate with mounting points for rails

Hardware (I will source)
608zz bearings (8mm x 22mm x 7mm)

Reference Sketch

The sketch shows:
Roller pin — square middle, round ends, gear mount
Roller — with square hole
Strut — bearing hole at top, tapered base
Rail — channel profile with lip (top and side views)

Please excuse the sketch as I am not a good artist

Notes
This is a working prototype, not a display piece — function over aesthetics
Friction fit for struts is intentional (adjustable spacing)
Needs good clearance underneath for future hopper addition
Design for standard FDM printing (0.4mm nozzle, PLA/PETG)

Please let me know if you have any questions