filament sensor
Hi !
Is the filament sensor of the MK3 be able to measure the diameter of the filament ?
What type of sensor is it ? Yes, it's a laser but how do they measure or detect ?
Maybe something like this is possible in the near future :
Thomas
Re: filament sensor
Hi !
Is the filament sensor of the MK3 be able to measure the diameter of the filament ?
What type of sensor is it ? Yes, it's a laser but how do they measure or detect ?
Maybe something like this is possible in the near future :
Thomas
Hi,
it may work as the laser sensor scans the area and detects movements or objects. Check this out https://conorpeterson.wordpress.com/2010/06/04/optical-mouse-hacking-part-1/
Question is how you can program that and how good the resolution of the sensor is to be able to recognize < 0.05mm differences.
On the other side the quality of the filament diameters within +-0.05mm got so much better and this function may not be needed anymore.
Waldemar
Re: filament sensor
based on the makerfaire interviews i think it is just a standard laser mouse sensor, capable of detecting presence and movement but not designed for measurement. are you specifically trying to continuously gauge and record the diameter to check for / correlate variance with print errors or machine failure? you might be interested in https://www.thingiverse.com/thing:454584
Re: filament sensor
Yes, this was the intension and the reason for writing this thread 😉
Thomas
Re: filament sensor
Yes, this was the intension and the reason for writing this thread 😉
Thomas
Hi here some links:
http://forums.reprap.org/read.php?1,636034
http://diy3dprinting.blogspot.be/2014/01/diy-filament-diameter-sensor.html
Re: filament sensor
Silly thought... but I always had a idea it might be a concept to run two sets of ball bearings with spring tension pinching the filament in both X,Y axis and have a accurate distance sensor between bearing axis that would feed the offset values information back into the extrusion multiplier.
The small variance in good filament doesn't seem to be a problem, but I have read about those that require tighter tolerances seem to be affected by filament creep.
To have real time measurement seems like that would be a easy solution given the need.
Re: filament sensor
Silly thought... but I always had a idea it might be a concept to run two sets of ball bearings with spring tension pinching the filament in both X,Y axis and have a accurate distance sensor between bearing axis that would feed the offset values information back into the extrusion multiplier.
In this interview with Maker's Muse Jo mentions that mechanical sensors "grinds down" after a while. I'm guessing there is a way to design around that, but I wouldn't know how. 😀
Re: filament sensor
Silly thought... but I always had a idea it might be a concept to run two sets of ball bearings with spring tension pinching the filament in both X,Y axis and have a accurate distance sensor between bearing axis that would feed the offset values information back into the extrusion multiplier.
In this interview with Maker's Muse Jo mentions that mechanical sensors "grinds down" after a while. I'm guessing there is a way to design around that, but I wouldn't know how. 😀
Clearly I can't know...but
I believe they were referring to drag over implementations.
My guess would be a plastic micro switch...
The idea of using something made of a very hard metal, and only to measure diameter between two point of the filaments chord.
If a brass hobbed gear can maintain itself...I am sure a case hardend rolling bearing will suffice and not wear out prematurely.
If I understand your concern correctly?
And to elaborate on why the sensor Prusa use for fillement detection is good/ better than a microswitch, is that a photo sensor can be used to indicate "motion" that the filament is feeding at the proper rate, or at all....
A typical micro switch can only indicate that there is filament triggering the switch, and won't indicate jambs or skipping.