Let's take a closer look at the inline filament diameter sensor - available for DIY now!
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Download the design and all files (Fusion source files, Eagle PCB design, Firmware) https://www.prusaprinters.org/prints/57154-infiDANK
Some of the parts required (full BOM at the links above)
SS495A linear hall effect sensor http://go.toms3d.org/SS495
ABEC-rated 623-ZZ bearings http://go.toms3d.org/623ABEC
6x2mm magnets on Amazon http://go.toms3d.org/6x2magnet
PTFE tube http://go.toms3d.org/bowden