Using the external switch on laser filament monitor

Thalios

I cried victory too soon in my earlier post.

current settings:

M591 D0 P5 C"io3.in" R1:500 E5 S1

Stops randomly with negative values.

Thalios

I also disabled the switch. Completely useless.

Phaedrux

What type of filament are you using? It can be sensitive to the transparency of the filament.

Have you tested with different types yet?

There have been a few mods posted to transform it into an indirect sensor.

There are a few options discussed here: https://forum.duet3d.com/topic/10042/indirect-bearing-laser-filament-monitor-concept

Thalios

that's the thing, it is an indirect sensor. I followed the steps and slightly modified it. When I check the readings, I get regular 150-250 values. But sometimes, I get a negative value.

Here's the current:

Duet3D laser filament monitor v2 on pin io3.in, disabled, allow 1% to 500%, check every 5.0mm, version 2, quality 223, brightness 72, shutter 136, measured min -47% avg 226% max 400% over 65950.4mm```

How can it be in the negatives?

I used a stainless steel rod as indirect which I sanded down to "de-polish" it. could that cause a problem?

Phaedrux

@Thalios said in Using the external switch on laser filament monitor:

I used a stainless steel rod as indirect which I sanded down to "de-polish" it. could that cause a problem?

Photos?

Thalios

Phaedrux

Yeah I could see how that could be problematic. Could you try adding a piece of dark matte tape it for a less shiny textured surface?

Thalios

I think i'll put a black shrink tube on top of the rod to see how that goes.

But I grinded it more with a dremel to remove all shininess and so far it hasn't faulted on me (I shouldn't jinx myself..)

We'll see tomorrow!

After 7.5h of printing, I have this:

Duet3D laser filament monitor v2 on pin io3.in, enabled, allow 1% to 500%, check every 8.0mm, version 2, quality 224, brightness 63, shutter 123, measured min 145% avg 223% max 243% over 43342.3mm

Thalios

2 successful prints in 48h. Very happy so far! I get a good reading with the dremel grinded rod.

Now I need to make the same thing on my other 2 printers to get reliable results hehe.

Thanks again!

Phaedrux

Glad it's working now.