Filament sensor now finished and sent off to OSH park for prototyping. Anyone interested in testing one? Still need to figure out how to connect it to smoothieboard and get it working, so any help would be appreciated! This is based off of Prusa’s filament sensor.
That’s a pretty slick place to put it.
Very compact design. I’m a bit worried how that bend is going to affect feeding filament. Not sure if you’ll be able to use carbon fiber filaments, they might be a bit too stiff and break.
We already use this design on our printers. All that’s new here is the filament sensor.
Oh wow that’s pretty cool
so, i presume you need to look for constant changes in value of the sensor (motion in jagged crimped filament) witch should correlate with extruder speed…
hooked on analog input, with alarm/pause loop included…
to bad i’m preoccupied with other stuff and my new “smoothieboard” is going to sit for a while on the desk…
but nice work.
I don’t know if smoothieware is even looking at supporting them but Duet supports that sensor and at least some flavors of Marlin.
@Jeff_DeMaagd Have they implemented the sensor already? From looking at the forums, it seems that they are still testing it? https://www.duet3d.com/forum/thread.php?id=3667&p=1
@Jeff_DeMaagd why should you wait for official implementation…
write it, post it for testing and if there’s enough attention it will be implemented in official build…
it has been like that in marlin for a while.
edit:
not to be negative, but to encourage anyone with time and skills to do it.
@Marko_Novak Because I’m not a programmer. I’ve got enough shit on my plate that an official solution would come before I can finish one.
Interesting that it feeds out the idler arm, instead of the other way around.
@casey_dunn when the filament pushes into the Bowden tube, the resulting tube tension helps tighten the grip a little bit. It’s a nice approach. (My B’struder design also does the idler Bowden fitting but in a rather different overall form factor.)
I want to have a chance for its function testing. May I?
I’m afraid bc of the bowden tube , it might have been too late to save a print before the jam been detected. But the design is simply amazing and compact!
We already manufacture these extruders, but out of aluminum. Switching to plastic… but that’s another topic. This is about filament sensors!!
@Edward_Fung do you have a smootheiboard? What printer?
@Ryan_Carlyle What do you mean helps tighten the grip? I don’t follow. Idler wheel pushing harder on filament? Hmm never thought of that and wasn’t intentional. Doubt it has any effect though.
@Shai_Schechter it has to do with reaction forces. The hob pushes the filament into the bowden tube. That filament compression puts the tube under equal tension. Tension on the tube applies a force at the fitting and thus idler arm. That force on the idler arm assists the tension spring / helps pivot the arm so the bearing pushes on the filament harder.
@Shai_Schechter does it work with marlin/repetier and older Ramps?
@ekaggrat_singh_kalsi It was originally designed for Marlin. But we need to test it on smoothie.
it’s a very smart placement, very nicely done!
i have a re-arm (runs smoothie) board. i’d be happy to help test it, and could also help with smoothie code (i’ve made public some modifications in the past) - if you are willing to make the schematic for the board opensource (or if it already is).
I love the compact design but I’m also a bit unsure how the curve effects tpu or petg.