Thank for all your ideas, guys. I does seem that I can't achieve what I want whilst on v3.3.

So I am in the hands of Ooznest and will have to wait to see when / if they decide to release a later version of their firmware.

Of course, this macro would make a great plug-in, and so getting around this data input issue!

@HebigT @HebigT I'm not sure I understand what you are saying here.
Is there an actual command (and presumably through a screen interaction) in v3. 3 which allows a user to type in and enter a value, and to then assign this value to an existing variable?

I still cannot find any means of entering an external value. I am still having to resort to having multiple versions of this macro, each wirh different values for doc.

@HebigT Yes, I did look into the M291 function, but sadly, I am still on the v3.3 (awaiting any update from Ooznest)!!
Does this mean that there is no other way to program in a variable DOC? Apart from setting up numerous versions of the macro, each with a different value for the doc?

@CthulhuLabs I use your surfacing.g code on a regular basis. Love it.
But is there any way to modify it so that the Depth of Cut could be adjusted by user input?

It would be nice to be able to enter a different value each time I use this macro, without having to edit the code. It would be even nicer if the DOC could be modified on each susbequent pass ("run again"). Perhaps also to limit the input value to between 0.1mm and 3.0mm?

@t3p3tony, I am still at the waiting stage for the arrival of my killerbee, otherwise I would test this out myself.

My main interest lies in the bluetooth connection, because if this works it will be a much cheaper alternative to the PanelDue or a pendant, at a cost of around £5 (plus a couple of connectors).

The app itself is free, and offers way more control and features, and can be used on an Android smartphone or tablet. It can control the cnc both with up/down/left/right buttons, and also with a really useful touchpad control. My limit of understanding is that the app is 'grbl1.1-compliant'. I'm not sure whether the Duet meets this requiement.

As I said earlier, I have successfully used it on my CNC3018 for a while and find it really easy to use.

@t3p3tony , "G-code2Grbl".

I have been using it, via bluetooth, for some time on my smaller cnc machine, and found it to be excellent.

If this were to work on the Duet, it would mean a wireless device which moves the spindle, runs jobs, and runs macros.

@t3p3tony Unfortunately, I don't know. When the bluetooth module connects, there is 2-way communications, initiated by the bluetooth module. See attached pic. Gcodes for movement are issued without needing any response.

At the moment I use an Android app which provides full XYZ control (including the use of a touchpad to move in the XY plane) of a CNC machine (in fact it provides nearly everything offered by the web interface and/or the PanelDue). The app outputs a bluetooth signal which is picked up by an HC-06 bluetooth module which connects into my cnc control board, a Woodpecker 3.4.

The wired connection from the HC-06 onto the control board consists 0f +ve, -ve, Tx and Rx. Exactly as supplied via the PanelDue connection on the Duet 2 board.

The app provides standard G commands to drive the steppers.

Would this HC-06 bluetooth module work with the Duet 2 board?