Best posts made by Kulitorum

Ability to change movement/feedrate button increments, please

I work with a 8x8x6 meter concrete printer...... 100mm is not very long to move, and 6000mm/sec is just slow af....

Kulitorum

@Kulitorum here.

I tried to use G2 and G3 but they are not interpolated very nice in current firmware and pausing during a G2 or G3 messes up and the printhead moves in random directions. I talked to dc42 about this, but I guess the current use of G2 and G3 is too low for him to spend time with it.

So I use very short lines of a max of 5 mm. With good jerk and acceleration parameters, that moves smoothly and allows me to pause a print at any time within 25mm, in regards to 4-5 commands being buffered in firmware.

Your slicer should keep an eye on overflow (crossing 360 degrees) and if needed "rewind" the rotation back to 0 to untangle your wires.

Now watching thread, if you need more help. Unfortunatly I can't share my code.

Kulitorum

This is the printer:

@dc42 Hello again.

We setup a test where we ran the same gcode with the nozzle rotation configured for the U axis and for the A Axis.

Thinking that the shaking would be clear, I mounted a gopro on the printhead - looking down - and put some gloves on the floor for reference. The most obvious result is that the whole print happens a lot faster when the nozzle is running as the A-axis, but looking at the printer in real life, you also notice some shaking and hard accelerations on the U-axis version.

I have uploaded an (unlisted) video here: https://youtu.be/abVquTFmLH8

I will mail the config files and gcode files (only the first layer) to you.

My conclusion is that the axies cannot be running the same code, something is not right.

Please have a look.

Michael

750w servo motor on the x-axis.

https://www.youtube.com/watch?v=nMCpMZPh6Ds

I hope to print at this speed, but I have set the expected speed at 300mm/sec. We'll see what the concrete pumps can do.

Kulitorum

@t3p3tony Yes, I did that already, so that you can pause the machine quickly if there's a minor issue. I'm cutting all moves into 5mm sections.

@phaedrux I mailed it to DC42

How did you get a Duet to be this noisy?

The design is wasting a lot of space on the XY plane, and not gaining much from it. And you move a lot of weight around for no real reason.

The couplers have to be 100% centered, and I doubt these are, as they are tightened from one side.

At least put the motors "outside" the moving area, so they "stick out" of the frame. This will increase your printable area around 10cm on both axes.

Lots of design issues IMHO

Xa Xb Xc, Ya, Yb, Yc ?
D,H,I,J,K,L,M ?