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New feature needed:inline filament diameter measurement

HI

I just came to the conclusion that this printer( and all others) should have a filament diameter measuring device inline that continuously measures the diameter of the filament and adjusts the output accordingly. I have had great problems until I found out that the diameter varied extremely ( up to 0.2mm! -> makes around 27% less material..). Since every filament manufacturer varies and even rolls vary over length I think this is a must, especially for home 3D printers where people use all kinds of rolls. 

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Filament Guide

ABS
  • Extrude at ~ 225o C.
  • Requires heated bed.
  • Works reasonably well without cooling.
  • Adheres best to polyimide tape.
  • Filament tolerances are usually tighter.
  • Prone to cracking, delamination, and wraping.
  • More flexible.
  • Can be bonded using adhesives or solvents(Acetone or MEK).
  • Fumes are unpleasent in enclosed areas.
  • Oil Based.
PLA
  • Extrude at ~ 180-225o C.
  • Benefits from heated bed.
  • Benefits greatly from cooling while printing.
  • Adheres well to a variety of surfaces.
  • Finer feature detail possible on a well calibrated machine.
  • Prone to curling of corners and overhangs.
  • More brittle.
  • Can be bonded using adhesives.
  • More pleasant smell when extruded.
  • Plant Based.

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