Laser Filament Monitor - test results
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If you put the sensor AFTER the extruder, and aligned with the markings made by the extrusion gear, the texture will allow better readings for any type of filament. These optical flow mouse sensors work better with textures than with bright surfaces after all.
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@qdeathstar youch serious under reading on ABS!
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I'm kind of surprised. I printed my housing out of Carbon Fiber PETG. Had someone ask for some printer parts, so I'm printing in the same Carbon Fiber PETG, and it's very very close.
Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -1.9, brightness 77, shutter 17, measured minimum 91%, average 97%, maximum 112% over 9128.9mm
Co-Creator of the RailcoreII CoreXY printer
https://www.thingiverse.com/thing:2407174 -
@kraegar thats much better results... very workable.
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I am under reading again using transparent-green ABS
Hatchbox Transparent Green - Benchy Test
Calibrated Steps/mm 424
Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position 4.6, brightness 83, shutter 17, measured minimum 45%, average 69%, maximum 89% over 3968.1mmMatter Hackers Black ABS - Partial Benchy Test
Steps/mm 424
M591 D0
Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -8.1, brightness 89, shutter 17, measured minimum 93%, average 96%, maximum 99% over 366.2mmIm a little lower than my previous Black ABS test, but the steps/mm is also lower for this test (so it makes sense).. But I'm not way down near my white ABS or Transparent Green ABS....
Materhackers Lime Green (Opaque Neon) ABS Filament - Benchy Test
Calibrated Steps/mm 424M591 D0
Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -3.2, brightness 94, shutter 13, measured minimum 75%, average 91%, maximum 98% over 3974.8mm -
@qdeathstar looks like color of pigment is playing more of a part than the filament material for those ABS's
@DC42 It would be great to have the ability to set the 100% amount in much the same manner as the mm/revolution of the magnet can be set in that version.
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@t3p3tony said in Laser Filament Monitor - test results:
@DC42 It would be great to have the ability to set the 100% amount in much the same manner as the mm/revolution of the magnet can be set in that version.
I think it would be confusing to change the 100% amount. Also, if the sensor under-reads the average amount for a particular filament, you are also likely to get much bigger variation for that filament. For example, the post by @Qdeathstar gives 93% to 99% for one filament, and 45% to 89% for another. So simply adjusting the 100% amount wouldn't be sufficient.
Instead I think you should use the new M703 command in conjunction with the filament management facility to set up appropriate R limits in the M591 command for the filament in use.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 said in Laser Filament Monitor - test results:
Instead I think you should use the new M703 command in conjunction with the filament management facility to set up appropriate R limits in the M591 command for the filament in use.
I had the same thought.
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@dc42 said in Laser Filament Monitor - test results:
@t3p3tony said in Laser Filament Monitor - test results:
@DC42 It would be great to have the ability to set the 100% amount in much the same manner as the mm/revolution of the magnet can be set in that version.
I think it would be confusing to change the 100% amount. Also, if the sensor under-reads the average amount for a particular filament, you are also likely to get much bigger variation for that filament. For example, the post by @Qdeathstar gives 93% to 99% for one filament, and 45% to 89% for another. So simply adjusting the 100% amount wouldn't be sufficient.
Instead I think you should use the new M703 command in conjunction with the filament management facility to set up appropriate R limits in the M591 command for the filament in use.
Hi David, sure can set the limits to whatever, I was just thinking that it would be nice to "zero" the filament on the average for that type. Actually I might have zeroed it on the low reading as I don't care if it reads an "over extrusion" since the failure modes we are generally interested in lead to under, not over extrusion.
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Something seems to not want me to use this sensor. Second attempt to print the housing failed also. This time my fan shroud was somehow coming loose (never ever had this before) and knocked the print of the bed. 
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Ok, last ABS test
Matterhackers Light - Blue ABS filament - Benchy Test
Calculated Steps/mm 424
M591 D0
Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -2.4, brightness 92, shutter 11, measured minimum 0%, average 93%, maximum 102% over 3975.4mm -
@qdeathstar You seem to like ABS.
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@qdeathstar said in Laser Filament Monitor - test results:
Ok, last ABS test
Matterhackers Light - Blue ABS filament - Benchy Test
Calculated Steps/mm 424
M591 D0
Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -2.4, brightness 92, shutter 11, measured minimum 0%, average 93%, maximum 102% over 3975.4mmminimum 0?
do you mind checking that again?
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Yes, i can rerun that test later today. I think that might have been a real slippage, as this blue filament feels pretty slippery. I also noticed while i was loading it it didn't move the first time i pressed "extrude" but i chalked it up to me accidentally pressing the "retract" button instead. Its about 2 years old....
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I like spreadsheets, so I created one for tracking my results. Any other data needed?
https://docs.google.com/spreadsheets/d/1a5suKtijUsatl3DhUFiox_rfW39qo9kHSlihYHaAcxo/edit?usp=sharing
Co-Creator of the RailcoreII CoreXY printer
https://www.thingiverse.com/thing:2407174 -
@kraegar Thank you! Not sure why I didn't think of putting it up on Google docs, here I have all my results in good 'ol Notepad++. Thank you again. This makes it easy to keep updated without worrying about saving, losing or sharing.
Tinkerz
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@tinkerz No problem - I have a ridiculous number of data tracking spreadsheets for 3d printing. I can't do anything without tracking it, lol.
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@t3p3tony said in Laser Filament Monitor - test results:
@qdeathstar said in Laser Filament Monitor - test results:
Ok, last ABS test
Matterhackers Light - Blue ABS filament - Benchy Test
Calculated Steps/mm 424
M591 D0
Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -2.4, brightness 92, shutter 11, measured minimum 0%, average 93%, maximum 102% over 3975.4mmminimum 0?
do you mind checking that again?
M591 D0
Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -3.0, brightness 91, shutter 11, measured minimum 88%, average 95%, maximum 102% over 3973.3mmBetter result this time.
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Finally managed to print the sensor housing. It seems that the lazy-me (why should I disassemble my X axis before lubricating it?) got some PTFE on my build plate - perfect for first-layer adhesion.
Luckily nothing that gluestick won't overcome. 
So, assembly and mounting of the sensor probably tonight.
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Finally, the first result I can contribute:
Generic Black PLA (the same that is used for the housing):
Duet3D laser filament monitor on endstop input 3, disabled, allowed movement 40% to 120%, check every 3.0mm, current position -7.9, brightness 60, shutter 17, measured minimum 80%, average 87%, maximum 93% over 320.6mmHousing: @dc42 original, Open Top, 9mm base
PTFE Tubing: Generic 4mm OD 2mm ID (I will probably switch to the included Capricorn when I first switch housing parts.I am so happy to be part of the test group. As I don't have too many filaments I will probably mainly be concentrating on housing performance.
Also, this gave me a chance to solve a very annoying issue I introduced myself when I added my reverse bowden. It literally took me 15-20 minutes(!) to change filament because the extruder-near end of it was totally in the way and I ended up disassembling the extruder every other time.
The sensor housing now also is my reverse bowden endpoint and is mounted via nuts and screws so I can easily remove it when loading filaments.
EDIT: Also no started a Google Spreadsheet.
