I will look into the alternative of notifing people that they are raising a zombie post.

Another compromise is to start a new post and then link to the old one...

Give these a read if you haven't already

https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_BLTouch
https://duet3d.dozuki.com/Wiki/BLTouch_Troubleshooting
https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe
https://duet3d.dozuki.com/Wiki/Setting_up_automatic_probing_of_the_print_bed

It looks like someone (not me) added M583 to the wiki, intending to implement it, but never did it. I'll remove the wiki entry.

@dc42

Thank you so much, that makes total sense.

@martin1454 said in Retraction on the fly:

Quick question - Does linear advance/pressure advance improve retraction?

When you use large amounts of pressure advance you may need to reduce retraction, because pressure advance will already retract filament towards the end of some moves.

Ok so I've got it all connected.
Board runs 24v powering system/bed/steppers
hotend runs 12v via the old mosfet.

Blowers runs on the 5v and the heatsink fan is directly powered by the 12v psu.

Now to make another post, cause I cant connect to the damn thing 😞

Thanks for the help regarding this!

I can't think of any changes made to the Duet WiFi firmware that would introduce layer shifts that were not happening before; and I don't think anyone else has reported anything similar. So I suspect it is coincidence that the problem started after you updated the firmware, or perhaps you changed something else at the same time.

@kittyhawk , welcome to the forum!

If you search these forums for Anet you will find several posts about converting the Anet A8 to Duet electronics. I don't recall seeing the A6 mentioned before.

You could do it the other way round. Home Z using bltouch, then use a G1 S3 Z move with the type of Z endstop set to stall detection. That will adjust the tool Z offset.

Stall detection is at best accurate to +/- 1 full step of the motor.

Best I can tell from this page on how Slic3r calculates it:

Given in mm:
Fd = filament diameter
Ew = extrusion width
Eh = extrusion height
Sl = segment length

E = (Sl * (Ew-Eh) * Eh + π * (Eh/2)^2) / (π * (Fd/2)^2)

Which is independent of nozzle size, which makes sense because (ignoring pressure changes, viscosity, etc) it would be based on the amount of filament going into the extruder. I'm sure there is some additional math for the items ignored since the formula above gives a slightly lower value than my slicer did.

Using the T parameter doesn't delay the start of the step pulse unless there the last one ended less than 3.2us ago, or the direction signal changed value less than 5.3us ago. Also I am sure that a delay of 3us won't cause a noticeable effect. But there is nothing to stop you using the same T parameter in the M569 commands for the internal drivers too.

@gnatman your DWC is out of sync with the firmware i think. I would grade to the latest stable firmware and DWC:
https://github.com/dc42/RepRapFirmware/releases/tag/2.01

make sure you read the Whats New file for all releases in between your current one and 2.01:
https://github.com/dc42/RepRapFirmware/blob/dev/WHATS_NEW.md

You can use a common wire for the two BLTouch ground connections, but I recommend that you keep it separate from the wiring to the 24V devices. Otherwise, a broken ground connection or a wiring fault could feed 24V into the BLTouch or the Duet.

You can use a common +24V wire for the heater cartridge and both fans.

I thing both is working.. M408 Is what i was looking for but i will check the HTTP Requests thank you

@jaysson_ch Also its important to remember that +5 should make the bed move away from the nozzle, increasing the Z distance by 5mm. Similarly a -5 jog should make it move towards the nozzle. So if you have a setup where the Z axis moves the bed, not the gantry with the XY motion system on it +5 should make the bed move down by 5mm.

Sorry typo , yes extruder heat up , I have tested every thing with the M302 ( for speed ).
Many thanks and more questions to follow ( new subject bl touch )

@raykholo for the Duet here:

https://duet3d.dozuki.com/Wiki/Hardware_Overview#Section_Version_History

for the Duex:

https://duet3d.dozuki.com/Wiki/Duex2_and_Duex5_Features

its not had such a significant list of changes between 0.8a and 0.9 - that is mainly components moving around to improve manufacturability and EMI.

Interesting and thanks for sharing. I used Google translate to view you blog so something might have been missed in translation. Could you explain how you measured the temperature inside the heat break bore? This is something that I have an interest in doing myself.

Thanks.

@jml said in Is it bad to send movement commands if motor disconnected?:

Because of the wire getting caught on something during a print, the extruder motor wiring got disconnected. The extruder (driver) still works, so I'm just wondering what the probability is of the disconnection causing problems and if its a bigger problem if there is a lot of current versus less than an amp.

Is it possible to safeguard against damage when a motor is accidentally disconnected, and if so, is that implemented on the Duet3?

There are various levels of safeguarding that can be done. The best ones would add substantial cost to the Duet and require the board to be made larger. So we use a lower level, which is still fairly effective. See https://www.youtube.com/watch?v=uyWolKFzb-A.

Here are a couple of variations on the method suggested by @Jacotheron

Use a DC-AC solid state relay instead of a relay board. Connect the control terminals between PS_ON and +5V. Use a 5V relay module, which is easier to find that a 24V relay module. Connect the 5V power input between +5V and ground, and connect the control input between +5V and PS_ON.