Topics created by jhonf441

@Phaedrux thanks

Sure, if you can figure out mechanically how to do that, the Duet will certainly support it. All tool change steps are ordinary G-Code contained in files that are invoked when a tool is to be changed.

So if T0 is over here... and T1 is over there... that is easy to setup.

Again, figure out the mechanics.

That's right, the displayed height stays the same because the printer has to think it's still at the correct layer height. Baby stepping is just a slight nudge of the physical position.

There is a known incompatibility between RRF 2.05RC1 and DWC2. Either revert to DWC 1.22.6, or revert to RRF 2.03, until RRF 2.05RC2 us released (hopefully tomorrow).

@jhonf441 said in how to move a stepper motor constantly?:

The use case is a 3mm filament coil extruder, when I am not printing I am manufacturing filament.

@jhonf441 said in how to move a stepper motor constantly?:

some hours no more than one day.

so you just need a very long motion, and the limitation, if any, would be the size of the datastructure used for the coordinate systems and settings. Lets say 3kg 1.75mm filament is 1,000m, or 1,000,000mm - if the firmware cannot move to 1,000,000mm then you could do 1,000 moves of 1,000mm each? Or maybe you could set up the machine step/mm to be step/m and only need to move to 1,000m insteaf of 1,000,000mm?

I want to be able to have the sales of a duex, that is to say, heaters, fans, but with the freedom to use external stepper motors, I previously worked on a expansion board, which connects to the expansion head just like a duex uses the chip sx1509B, but with level converters for external stepper motors, which leads me to have to modify the firmware by changing the IC2 address of the chip, and I wanted to know if this is already implemented, with what I can do the circuit and put Everything to work.

cirt.png

this is the image of the circuit, similar to duex5 but in ulgar of tcm2660 it carries the breakoutboard level converters for 7 stepper motors.

I have tried to build the firmware for myself to make the change but I have not been able, after several attempts, and if I do it myself, this forces me to have to modify the firmware every time there is a new update.
  Your help will be greatly appreciated.

@dc42 said in Duet 3d did not consider:

We are also looking at including encoder interfaces on some boards so that we can do closed loop control.

That will be sweet

Sounds like you need a PID controller on the pellet feed (not gcode).

I know that the main concern of this type of systems, are the retractions, but from what I have been able to find out, the polymers have certain characteristics, it may be the same polymer but for different types of technologies their characteristics change, for example when they melt they flow as a liquid, but rather as a hot dough, and in theory that prevents material from dripping down the nozzle, but in case these drips occur, I plan to build a pneumatic system that stops and opens the nozzle very fast for extruder displacements .

Here you can find a system that closes and opens the nozzle.

https://wiki.utopiamaker.com/index.php/Extrusor_de_Pellets_para_Impresión_3D

just to make sure that you are aware of this.

https://drmrehorst.blogspot.com/2017/07/3-point-print-bed-leveling-vs-4-point.html

and

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

what do you want to use the 4 endstops switches for?

@veti said in Strange behavior:

@dc42 said in Strange behavior:

I think the simplest fix is for me to reduce the allowed rounding error, perhaps to 0.02mm.

should that not be based on the steps per mm for the axis?
i.e with a 2mm lead screw a full step is 0.01mm

Like I said in my previous response, this gets complicated when there is more than one motor affecting the movement of an axis. It's even more complicated when using nonlinear kinematics such as delta and Scara.

Thank you very much.

@zapta said in Esp8266 with external antenna in Duet Wifi:

(I am using 2.4GHZ wifi if it matters)

ESP8266 is limited to 2.4Ghz so 5Ghz will not be of any help.

@jhonf441 said in Pt100 2 cables en configuración 4 cables.:

Hola,
Tengo un sensor pt100 de dos cables cuyo largo es 1 metro, quiero saber si así puedo usar la configuración de 4 cables que esta en la wiki o tengo que recortar los cables? Y cual es la medida recomendada?
Gracias.

Using 1m cables with a PT100 will cause the temperature to over-read a little. How much depends on the thickness (hence resistance) of the cables. If it read more than a few degC too high when the hot end end is at room temperature, then use a 4-wire connection.