Duet WiFi firmware new feature priorities
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On option would be to have the speed setting included when the firmware saves parameters before executing a macro file. Then you could use M220 S100 at the start of the homing files, bed.g etc. But then you wouldn't be able to define a macro that e.g. sets the speed to 150%.
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I wouldn't go much farther than disabling the speed override for homing. If maximum speeds are set for all axes, and they are reasonable, no crashes should ever occur. In my opinion, max speeds should be set so that no g-code can cause undesirable behaviour. If I accidentally home my printer at 10,000% speed, it will (presumably, I haven't tried it) home at the max Z speed of 60 mm/s. Isn't that what limits are for? If your printer is crashing upon first move, limit the Z speed to one that will not cause a crash.
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When you implement "Support for three independently-controlled Z motors" can you also add support for two independently-controlled Z motors? I have two motors on each side of the heated bed, and I believe this isn't an uncommon setup.
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Yes I will be supporting 2, 3 and 4 independent Z motors.
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Yes I will be supporting 2, 3 and 4 independent Z motors.
Hi David…We talked on the RepRap forum about using 2 Z motors and multiple belts to sync the 4 corners of the XY carriage on my fixed bed (non-adjustable) Core XY build. You confirmed that Duet will soon have ability to independently control and sync multiple Z motors. Since I have 4 lead screws supporting the XY carriage in Z motion, will it be feasible to do away with the belts and run separate motors on each screw to level the XY carriage to the frame mounted bed? I'm at a stage where I can add two additional Z motors to the build for little cost. If you see this as a practical scenario I'd like to make that change now and be ready when the firmware upgrades are in place. Thanks...TP.
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Yes you can do that. You will need a DueX5 expansion board so as to have enough drivers. Until the new firmware is ready, be prepared for the motors to get slightly out of sync when you power cycle the printer.
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So then I assume a thumb knob at the top of each shaft would allow one to manually adjust the four corner back to level after power up. Will we eventually be able to probe the four corners through a program routine to level the XY carriage to a fixed bed?
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Yes, that's correct. You might want to temporarily reduce the Z motor currents using M913 while doing the adjustment.
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Not a very useful feature for most people, however I would love to see support for the Z-endstop being a safety for the Z-Probe homing. I've crashed the nozzle into the bed sooo many times while messing around with Z-Probes of different natures all while that mechanical Z endstop switch is triggered but doing nothing. I know, not many people would care. I guess I could wire that in to kill the machine if it's triggered somehow. So I guess my request would be for support for mechanical Z endstop while using a Z-probe for homing.
Jeff
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@(In)Sanity:
Not a very useful feature for most people, however I would love to see support for the Z-endstop being a safety for the Z-Probe homing. I've crashed the nozzle into the bed sooo many times while messing around with Z-Probes of different natures all while that mechanical Z endstop switch is triggered but doing nothing. I know, not many people would care. I guess I could wire that in to kill the machine if it's triggered somehow. So I guess my request would be for support for mechanical Z endstop while using a Z-probe for homing.
Jeff
You can do that already (I have). Just wire the mechanical switch to a spare end stop (say E1) then use M581 - something like this M581 E1 S1 T0 C0.
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I'm going to expand on my request to say, if any endstop is triggered stop trying to move in that direction. It's crazy you can get the printer in a state where it hits the endstops but just keeps on grinding away. It seams like some kind of Sanity check would be useful.
Thanks,
Jeff
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@(In)Sanity:
Not a very useful feature for most people, however I would love to see support for the Z-endstop being a safety for the Z-Probe homing. I've crashed the nozzle into the bed sooo many times while messing around with Z-Probes of different natures all while that mechanical Z endstop switch is triggered but doing nothing. I know, not many people would care. I guess I could wire that in to kill the machine if it's triggered somehow. So I guess my request would be for support for mechanical Z endstop while using a Z-probe for homing.
Jeff
You can do that already (I have). Just wire the mechanical switch to a spare end stop (say E1) then use M581 - something like this M581 E1 S1 T0 C0.
Ok, I just moved my Z-Endstop over to E1 and did as you suggested just changing S1 to S0 due to makerbot style endstops. Works like a charm, if I dig the nozzle in even a little bit past normal calibration it just shuts down….love it!! So now I guess I need double trigger endstops to do this on the X and Y also. Easier in software.
Thanks,
Jeff
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There's nothing to stop you having the shutdown trigger if the X and Y endstops are activated too. Just change the command to:
M581 X1 Y1 E1 S1 T0 C0
but you will have to disable this during homing, obviously!
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There's nothing to stop you having the shutdown trigger if the X and Y endstops are activated too. Just change the command to:
M581 X1 Y1 E1 S1 T0 C0
but you will have to disable this during homing, obviously!
That is a fantastic idea. Thank you!
Jeff
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Something else I did was to install switches on all the axes maxima, wired together in series and connected to yet another spare E stop. Then if I do something stupid like send an axis beyond it's maximum position before I've homed it, then it'll trigger an emergency stop before the frame gets mangled. I also have a physical emergency stop button wired the same way to yet another spare. It isn't a true emergency stop in that it doesn't cut all power - if I want to do that, I just press the button on the RCD I use to kill everything.
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Something else I did was to install switches on all the axes maxima, wired together in series and connected to yet another spare E stop. Then if I do something stupid like send an axis beyond it's maximum position before I've homed it, then it'll trigger an emergency stop before the frame gets mangled. I also have a physical emergency stop button wired the same way to yet another spare. It isn't a true emergency stop in that it doesn't cut all power - if I want to do that, I just press the button on the RCD I use to kill everything.
That's a good idea. It would be kind of neat if the firmware had the option to Not travel in a direction opposite of the end stops if you've not already homed. That way it would prevent some stupidity on the users end (myself). I've implemented the X Y and Z endstops triggering trigger2.g which I then just put an M112 in the file. Why did I go with the file…IDK...seamed like a good idea. It shuts off during homing moves except for homing the Z axis which is for really bad situations.
Thinking about it the option to prevent Non Homing moves if not homed would be good. Pretty much if your not seeking a home during a move and your not already homed prevent the move. Just a thought.
Jeff
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@(In)Sanity:
It would be kind of neat if the firmware had the option to Not travel in a direction opposite of the end stops if you've not already homed.
This is incredibly common in industrial motion controllers. I also think this is a fabulous idea.
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@(In)Sanity:
It would be kind of neat if the firmware had the option to Not travel in a direction opposite of the end stops if you've not already homed.
This is incredibly common in industrial motion controllers. I also think this is a fabulous idea.
I can think of a couple of scenarios where that might not be such a good idea. For a example, if you finish a print and turn the machine off, then when you next turn on the machine, you need to move the Z axis out of the way in order to remove the print that's still stuck to the bed. If it's screw driven, it could be a pain to move it by hand and if your only option is to move Z towards home you'd be a bit stuck. It'd also be a pain during commissioning, when you are trying to sort out motor wiring and rotation directions.
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@(In)Sanity:
It would be kind of neat if the firmware had the option to Not travel in a direction opposite of the end stops if you've not already homed.
This is incredibly common in industrial motion controllers. I also think this is a fabulous idea.
I can think of a couple of scenarios where that might not be such a good idea. For a example, if you finish a print and turn the machine off, then when you next turn on the machine, you need to move the Z axis out of the way in order to remove the print that's still stuck to the bed. If it's screw driven, it could be a pain to move it by hand and if your only option is to move Z towards home you'd be a bit stuck. It'd also be a pain during commissioning, when you are trying to sort out motor wiring and rotation directions.
It could be a flag that's normally checked so you just uncheck it to confirm that you know what you are doing if it's needed. Or it could pop a confirm box when you try to move a axis away from home so you had to click OK to allow the movement. I have done this mistake with my printer a couple of times and even if I know it will happen I do forget it sometimes.. A notification saying "don't do anything stupid" would help
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Personally I just have g-code at the end of my prints that clears the bed so I don't have to worry about dealing with moving anything around. I've never had to go back in and move anything to get a print off the bed.
Edit: A check box on the web interface or panel that says "Override Safeties" might do the trick for failed print removal.
Also I think restrictive safeties should be a flag so we can turn them off if we feel like it. I've had to re-tension belts too many times now because of my own stupidity, so personally I would love to see the machine try to protect itself 99% of the time. I have to say the old Mightboard I was running before did a better job at not grinding motors and belts. Yep that was a bit of a dig..sorry.
Jeff
