Magnetic vs Laser filament monitor
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@fma said in Magnetic vs Laser filament monitor:
Did you see this design?
I was going to try that with the Duet3D LFM but was planning to use two bearings!!! A magnet is MUCH better
Thank you for the inspiration
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Instead of a simple bearing, I would like to use a MK7 gear. Such like https://www.ebay.fr/itm/Feedstock-Wheel-Extruder-Gear-Drive-RepRap-3D-Printer-1-75mm-Pignon-5mm/182601677691, so there is a good grip. But there are 2 issues:
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there is a ratio between the filament move and what the sensor reads; This requires this ratio to be set in the firmware. I think this is not something difficult to do, adding a param to the relevant M-Code.
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the screw is on the sensor path
Any idea of a better gear to address the second issue?
Frédéric
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@fma said in Magnetic vs Laser filament monitor:
Instead of a simple bearing, I would like to use a MK7 gear. Such like https://www.ebay.fr/itm/Feedstock-Wheel-Extruder-Gear-Drive-RepRap-3D-Printer-1-75mm-Pignon-5mm/182601677691, so there is a good grip. But there are 2 issues:
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there is a ratio between the filament move and what the sensor reads; This requires this ratio to be set in the firmware. I think this is not something difficult to do, adding a param to the relevant M-Code.
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the screw is on the sensor path
Any idea of a better gear to address the second issue?
I'm looking for the path of least resistance in my design. I don't want the drag of a heavy geared hob. I'm not saying it won't work, I believe the more attempts to create different version is better in the long run for everyone.
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@timcurtis67 Something like this might be good, too. It's a plain bearing with a silicone or urethane coating of variable hardness and colour. https://us.misumi-ec.com/vona2/detail/110300423960/?CategorySpec=00000030014%3A%3Aa unitType%3A%3A1&Inch=0
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@bot Yep, that would work as well.
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It seems that the detection of the laser sensor is optimized for steal...
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Stainless steel, yes. However, we've been trying to get it working with a mix of materials. Having a consistent material that works is all that matters, and that specific product offers a variety of choices (4, really). If none of those work, I suppose you could try a plain bearing, but then you cannot be sure that the bearing is being driven by the filament at all times. Silicone or urethane coating would help with grip, without having a hobbed idler that may damage the filament.
I would personally choose a hobbed gear like a bondtech with a very fine tooth pattern, as to not damage the filament. I suggested the misumi bearings as an alternative to anyone looking to try something else.
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@fma said in Magnetic vs Laser filament monitor:
Did you see this design?
LOL: it's laser AND magnetic!
It still seems similar with the one I linked (and the others linked in that thingiverse page).
But my question (that I forgot to address in the OP and that bot reminded me) is: is this system with laser sensor on a bearing reliable? -
@fma I was going to cover the bearing surface with something.... But I would test it first as bare bearing... As there is nothing to resist the movement.....
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@mr-yod said in Magnetic vs Laser filament monitor:
@fma said in Magnetic vs Laser filament monitor:
Did you see this design?
LOL: it's laser AND magnetic!
It still seems similar with the one I linked (and the others linked in that thingiverse page).
But my question (that I forgot to address in the OP and that bot reminded me) is: is this system with laser sensor on a bearing reliable?I believe it is but we will find out soon enough. There will probably be a few versions built shortly.
