Sorry for answering to this old post. And this is only for info:
I have finished the work on my prototype watercooled hotend. Now it's ready to make first tests...
The heating block and heatbreak is from a DTO hotend.

Here are some images

@andreic I think your ducts produces to much back pressure. You should test the fan in "free air" for comparison...

@matt3o Well done! And a very nice Print!

@tinchus I think you can solve the problem with putting an ";E" after the comment semi-colon, like this:
G1 Z400 ;E drop the print bed (E to exclude from layer count)

(Obviously, you need to be in absolute positioning mode for this to work)

This post is only for information and for closing this point!

The problem with my tacho signal is solved.
I have developed a signal multiplier/divider with a raspberry pi pico. The system is able to multiply or divide an incoming (tacho) signal with a factor between 1 and 15.
When i multiply my flowmeter tachosignal with factor 5, i'm allways in a range which RRF can read.

If somebody has a similar problem, i'm happy to share my project.

@educatingsavvas i think T-1 should work

This post is just for info:

I have expanded this "TachoMod" project a bit.
Actual version is V4.0 with the following additional functions:

• Raspberry Pico has now a small OLED-Display (with 2 buttons) for displaying datas and enabling a menu
• Tacho-signal period and rpm of in-/output is displayed
• Menu for changing multiply/divide mode, factor, timeout, pulse per revolution
• stores all settings on onboard memory

If someone is interessed, i can share the source code and additional infos...

@cr3d I don't know which macro is called when the filament out sensor triggers...
But in that macro you can "store" the actual Extruder Value in a variable, make your math, and call another macro after 50cm of extruding.
Eventually is daemon.g also a good option to put the code in...

@agusano Which FW Version are you using?

Eventually you can invert it with a leading "!" in the M950 command

M950 F2 C"!Fan2" Q25000

@peirof @engikeneer ASA is more or less like ABS. It's really good for outdoor usage, because of very good uv-stability. The max temp is approx. 90-95°C
Small parts are no problem to print without warping. For big objects a (heated) chamber will help.

@dc42 @Phaedrux
I'd like to jump in too. Thank you very much for your work on the DUET systems.

@FelixH Could it be that your idlers on the cartesian machines have no teeth (only a bearing)? Then you see the teeth of the belts which are running on a flat surface of the bearing as artefacts on the surface of your printed object.

@gnydick There is another posssibility with:

if job.duration = null

@handyandy it should be possible to wire the +5V to the "V fan jumper select 5V pin" and the GND to a "fan output(-)" like "Fan1-".
In this way you can control the fan speed with PWM.

@fcwilt Ok. I think it should be possible with a "Schmitt-Trigger"...

@fcwilt I had the same problem some years ago. The trigger inputs are not debounced.
You have to program a "software debounce" with a delay and then read the input again.

@sonderzug @Phaedrux
thank you both for your answers. But i was not able to print with T1/T2/T3, without "touching" T0!
The only way was to define a printer with only 3 tools and use T0/T1/T2.

Hello,
i have a toolchanger with 4 tools (T0-T3). In cura they are listed with Extruder1-4.
I like to print a model with "only" 3 tools (T1-T3). But it seems not possible to disable T0 copletely!?

I have disabled T0 (Extruder1) in Cura, but it picks up T0 everytime for the prime tower!
Also, when i define the primetower for T0 to 0 mm3 volume. It picks up the tool, heating it and do the move to the primetower and back to the dock...

Can anyone help me?
Thanks in advance.

@too-stroke Eventually it helps, when you insert a "M400" command between line 6 and 7.

@too-stroke can you please share your homedelta.g file from the sys folder?