Summary

Researched for a filament buffer solution for my setup and after seeing Printables - PLG version I designed this. Happy with the outcome using 3x coils of filament on the wheels.

Note: dont recommend using only 1 coil on the wheel, 2 kind'a works but best with 3 coils as a minimum.

Printed on Pursa i3 MK3s
0.40 nozzle
0.30 first layer
0.20 build layers
20% infill

To assemble you will need:
22dia x 7mm wide - 8mm centre bearings
M4 x 35mm long cap screws and nuts
5g x 20mm self tapers

I have uploaded the CAD drawing for the fixing bracket, feel free to modify it to suit your requirements.