Topics created by Gerrard

@gerrard
It looks better, let's hope the print doesn't shrink too much this time 😉

I saw a simple way to improve your printer: the tall idler bearings should be supported from both ends.
idlers.jpg

@Phaedrux, I've run the pressure advance script (here) several times, and I've picked a value that gives the best results (0.025 in my case), but it hasn't helped. Based on the explanation here it seems that pressure advance is simply a multiplier applied to the acceleration - a higher number means more extrusion during acceleration/deceleration.
In my observations however, As I increased the pressure advance value, I noticed that the mid-line regions (constant speed regions) became under extruded - for higher values the lines wouldn't touch. For low values I noticed that the ends became shorter - and for really low values not quite touching the perimeter lines.

To be honest, I've only tested this "on the fly", and I haven't dedicated any real time to it, so it's possible that other effects are at play.

The main intent of exploring this avenue was to explain my observation that the motor went backwards slightly - job done.

Hazzah! How 'bout that.

I am still curious if running M98 P"config.g" would have shown that as an error.

@Gerrard I think its already been answered by dc42, but I quite often get those over temp and short to ground errors on my Duet WiFi when I hit the Estop. I have a separate 5v power to the Duet so the processor and web control stay on and I can see them. In my case there definitely isn't a short to ground and the temperatures are all low/stable.

The Duet is designed so that the driver chips conduct heat to the back surface of board (hence you cool the board) not the drivers directly. See https://duet3d.dozuki.com/Wiki/Mounting_and_cooling_the_board#Section_Mounting_1
One other benefit of this is you can get a reasonable idea of how hot things get over time (transients less so) by looking at the CPU temperature. If doing this though, I would recommend calibrating the CPU temp (follow this guide https://duet3d.dozuki.com/Wiki/Calibrating_the_CPU_temperature)

Side note on the cloned boards. The blue heatsinks they ship with probably make the cooling situation worse. Most people stick them on top of the drivers (plastic surface so doesn't conduct heat very well) and they tend to block any good cooling airflow over the board.
Also, I recommend double checking all the soldering joints on the bottom of the board. I have a clone board and found it had a couple of bad/dry joints on the heater pins

Motor currents should be around 80% off rated max. Did you change the config for the new motors?

Is the nozzle getting caught on curling print?

@Gerrard said in Consolidating supply and GND for hotend:

Can I run 2 laser filament sensors from the 3.3V and GND of one pin (say E0), then use the input (E0/1 STOP) pins from E0 and E1.

Yes the filament monitors can both be powered from the same 3.3V and ground connection

Then, can I run a 12V and GND from the Power In terminal to the hot end to power the fans and LEDs, and run the Fan's PWM signal pin to the FAN0- and FAN1- pins?

Assuming you are using 12Vs to supply the whole system then you can use a single source of 12V, and switch the -'Ve sides (i.e use the FAN0- and FAN 1- for the two fan 've connections, possibly use fan 2- to control the LEDs.

caveats

You need to ensure you don't exceed the limits of the fan mosfets (1.5A max) There is a potential failure mode where the VIN voltage shorts onto 3.3V. this is more likely if you bundle all the wires up into the same bundle. You mention you are using a ribbon cable. This can be a good solution but be careful to manage the strain relief and flexing to it does not break and short. Also check the max current rating of each of the conductors in the ribbon cable (probably 1A max or less). If you end up putting 12V and the return GND over multiple conductors then if one breaks, the other ones will end up carrying more than they are rated for, and get hot.

I asked a related pulley question and came to the same conclusion, buy pulleys from industrial suppliers. I like your method though since it gives quantifiable data. I just used an engineer square propped up to see the barest sliver of light and if the light disappeared as a tooth passed or the light grew to be more than a sliver I thought I could judge eccentricity. Turns out almost all of my pulleys actually have a U shaped profile in the tooth such that if you lock down calipers in the middle, you can't slide them to the edge of the pulley, and not at a consistent stopping place either.

SG= stallguard. See page 10 of the datasheet i linked above.

10-bit unsigned integer stallGuard2
measurement value. A higher value indicates
lower mechanical load. A lower value indicates
a higher load and therefore a higher load angle.
For stall detection, adjust SGT to return an SG
value of 0 or slightly higher upon maximum
motor load before stall.

I realize this is an old thread but I'm curious if any head way has been made. I was thinking of trying to do something like this with the available touch probes. I have installed this probe on my machine and written a macro to find the XY coordinate of the corner of the work piece shown here: https://youtu.be/sxFnuANYMj0?si=RC7X4tuDhhlL49RF

With the Meta commands is it possible to make reprap generate an output file using the M28 command an the M114 command to store the point cloud data. I think all that would be needed is a set of commands like move so many mm in x then do a probe, on contact save that coordinate, lift up a bit, make another move and probe. Repeat that until there is some user defined stopping point, then move in the Y direction and move back to the X starting position and repeat for as many Y directions as needed.

Is this something that anyone has done, or is there an example of this with meta commmands. I'm very new to meta command and text based programming in general.

Thanks, that worked.

@Gerrard said in Duet 3 - Invert Reset Pins:

What's the pin name for the reset pins?

Doesn't have one, its a hardware reset pin directly to the microcontroller.

Are the Workbee files based on DWC2 or DWC3? If they are based on DWC2 but you have at some point installed DWC3, then you should be able to load the Workbee version by appending /reprap.htm to the IP address in your browser address bar.

@maxspongebob said in Obey hard limit switches?:

Requiring that the customer also create and program macros to achieve basic functionality is a stretch.

Really? Given the amount of work that goes into building these machines a few minutes coding a macro is a stretch?

Frederick

You can also customize resume.g

If your esteps and extrusion ratio are all good, try switching off the pressure advance and use come "coasting" in your slicer.

Start at 1.5mm for bowden, and see how that looks. Then you can step it up/down by 0.5mm as you home in on a result.

I get some nice surfaces that way.

@Gerrard Now look at corners of a square print- at low jerk and accel they then to get fat and rounded. Everything is a trade off.

@Gerrard said in Duex5 PWM Issues:

but I'm more keen on just getting my 2 x questions answered rather than diagnosing other potential issues.

No worries. The reason I ask before spending much time diving too deeply is that often times it's a simple miss, or a combination of errors. Having the full picture saves me time in the long run.

Glad you got it sorted out.