Posts made by zzing

How is this any different from regular cartesian movement?

Update:

It just worked after I redid the entire wiring and seating and got:

Auto tuning heater 1 completed after 3 idle and 10 tuning cycles in 731 seconds. This heater needs the following M307 command:
M307 H1 R1.701 C224.5:193.5 D8.77 S1.00 V12.8

Quite different than the original.

Something rather interesting happened yesterday. When I went to do another test it heated up to target temperature and then cooled down naturally. The test never completed and I couldn't get the heater to heat up again.

So now, I try to heat it up and have a fault. I reset it, and jiggle the wires a bit as I tell it to heat again. It does so.

I do not know if these are related but will be taking a closer view at the wires of the heater. The printer has been sitting for some time and went through a house move.

Here is the output of the console (backwards in time):

1/17/2021, 2:12:31 AM	Warning: Auto tune of heater 1 failed due to bad curve fit (R=1.548, 1/C=0.0056:0.0050, D=9.3)
1/17/2021, 2:08:05 AM	Auto tune starting phase 3, fan on
1/17/2021, 2:04:42 AM	Auto tune starting phase 3, fan off
1/17/2021, 2:01:44 AM	Auto tune starting phase 2, heater settling
1/17/2021, 1:58:17 AM	Auto tune starting phase 1, heater on
1/17/2021, 1:58:12 AM	M303 T0 S215
Auto tuning heater 1 using target temperature 215.0°C and         

PWM 1.00 - do not leave printer unattended

The previous model from well over six months ago, but updated by an M500 command:

M307 H1 R2.044 C129.200:129.200 D5.70 S1.00 V12.8 B0

I haven't attempted to do it again because it is getting late, and just wanted some feedback if this is something that might change by running it again.

It is not the negative deadtime another search for this issue had.

The printer is a delta printer, duet wifi (early version), V6 connected to a Smart Effector, PT1000 sensor.

Smart effector

I believe it was 9 factors using 10 points or something like that (it was done with the configuration tool).

I have been using it for a while, and it always seems to work. My main concern was if the math could provide issues because of the imprecision.

Just a small question:

If I were using sensorless homing from a duet wifi (which I am), along with a 10 point calibration before every print are there any sorts of problems I should expect to come up?

It is using smart effector.

I am considering adding "real" endstops such as optical (I have a few).

I printed a few circles on my delta's build platform using a layer height of 0.2mm.

Image of it is here with annotations as to what they feel like, and the height map:

https://imgur.com/a/eFfAAAC

Printer equipment is a mini kossel with linear rails, smart effector, v6, 600mm bowden tube, bondtech extruder. PEI bed.

So I have done everything that I know I can do - namely delta autocalibration, and mesh compensation.

The center is looking perfect, and a couple of them are okay as well. But some are rough (the lines themselves) and some have actual raised bits on them. I am considering lowering the extrusion rate to see if some of that goes away.

Any other suggestions?

I cannot say that it is perfectly calibrated, but I have s3d and prusaslicer producing reasonably good models on some basic calibrations. So this might be sufficient.

I have finally gotten some results with acceleration of 3000, and jerk of 400.

Any higher of a jerk and it makes too much noise, 400 still has some noise but it is almost reasonable.

In my test I had the corners progressively get worse, and finally the Z seam.

At no point did the Z seam reduce amount.

I figure a good value is roughly in the 0.5 to 0.8 range, and I am testing that now. The documentation seems to suggest 0.5 is a reasonable place to be, which looks right. Although it is questionable if there will be a way to really see much difference here.

I am also looking for other strategies to reduce the z seam as well.

I posted my config: https://gist.github.com/madebyjeffrey/883d9b626b647376cd3134a3569f2777

The acceleration and jerk values for the extruder are not totally up to date. Should be the 200 and 500 mentioned above.

Retraction presently is 2mm @ 40mm/s - set in slicer.

Extruder is a bondtech connected to a 600mm bowden tube to the smart extruder with v6 and a .35 nozzle attached.

When I was using thousands the extruder was making a lot of noise. I can study it a little more tomorrow to find out what values it happens at.

It was generated by the configuration. I removed the E values from there.

Now after I set:

M566 X1200.00 Y1200.00 Z1200.00 E200.00 P1
M201 X3000.00 Y3000.00 Z3000.00 E500.00

For the range of PA values 0.5 to 2.5, something interesting happened.

Above S0.5, there is a lot more vibration. At no place does the seam reduce much, it is always there. Starting at S1.25 the corners start to deteriorate, except for the one immediately after the seam. It definitely just looks as if it stops extruding in ever increasing distances from the corners affected.

It was in homedelta.g

Is there a way to have this thing save some settings like saving them onto a stack, changing them, and popping them off after?

I just checked the values that were actually active and got these numbers:

Maximum jerk rates (mm/min): X: 1200.0, Y: 1200.0, Z: 1200.0, E: 40.0, jerk policy: 1

Accelerations (mm/sec^2): X: 3000.0, Y: 3000.0, Z: 3000.0, E: 120.0

It is like it is being set some place but I haven't seen them be set anywhere else in the config file. I will have to go through the other files.

It might explain why certain things aren't working. When I tried setting them particularly higher (which turns out to be massively higher) harsh noises were made.

So was doing two pressure advance tests today, one from 0.35 to 1.10 and another from 1.10 to 3.10. I set the print speed to 80mm/s, and I noticed that the interface said it was actually going about 22 to 25mm/s at maximum.

I am doing 2 perimeters, and it ended up doing the external perimeter at 40mm/s (50%) - although actual speed was again 22 to 25mm/s. It is using the script provided on the documentation page that describes a calibration.

I don't know if it was because of the crazy slow speed or not, but the ridge on the z seam doesn't really change. But I started noticing patterns in the second test's walls (they wouldn't be visible to a camera because of dark filament and low light). They feel like sections of the walls have slight thickness variations almost causing a wave feel.

I noticed the side effect of enabling pressure advance indicated it might slow down because of jerk values. When I recently upgraded to RRF3 I might have made some errors perhaps? Opinions on my configuration would be valued: https://gist.github.com/madebyjeffrey/883d9b626b647376cd3134a3569f2777

My machine is a mini kossel upgraded to have a duet wifi, linear rails, smart effector, v6, and a 600mm bowden tube on a bondtech extruder. Current filament is PLA.

EDIT: I wanted to add a note. I noticed the speed decrease explicitly towards the end when the PA was higher, I don't remember what it did prior.

@jens55 After calibrating esteps, the only other thing I usually do (didn’t this time) is print a single or doubled walled vase mode cube to see if the width is what it is expecting. Although that one seems a little more of a cuts oriented method.

Do you know any other methods of doing that?

So I ended up trying to calibrate pressure advance using the methods described in the documentation using a 100x100x40 empty cube in PrusaSlicer. Using 2 perimeters, and 2mm retraction (note ~600mm bowden tube with capricorn tubing) I only ended up with a ridge at the seam.

Please see images here: https://imgur.com/a/2mQNHjk

You can see the ridge - so I am not sure what to do with this. Is my pressure advance range 0 to 0.35 too low? I do have non-linear extrusion configured. Is the retraction too low?

I have had some 'eyes' from the large mega man created last year from one of the large youtube channels. You can see the image at the end of the images. There is no pressure advance here, but there are artifacts here.

The second issue that popped up is the first layer. You can see plenty of images of it, I don't know if this is related to the pressure advance or the artifacts on the "eyes". There is a video where you can see it potentially from another angle: https://youtu.be/ALPjO4A7ypM

The last thing I did - which I don't know if it will affect anything related to this in the future is upgrading from RRF2 to 3: Updated config: https://gist.github.com/madebyjeffrey/67146b94f22036f57bc31184787e2d1f - it looks like the port for the smart effector wasn't mentioned anywhere in the documentation but the configurator generates the right port so I copied that. Any comments on this would be appreciated - in case I missed something.

I am not sure if I set that or it was configured from the tool to build a config. With all those other values I could probably use realistic values for a delta machine.

I can retest then.

I was reading though some of this to take a look at my own values.

What is quite odd is that the point at which the fast areas and slow areas are equal in width is at 1.75 - which seems crazy high according to the documentation. I am using a bowden tube of capricorn of length ~600mm. It has a bondtech extruder and a smart effector/v6 combo on the output.

I was using the original script from the start.

The other relevant settings from config:

M92 X80.00 Y80.00 Z80.00 E830.00                  ; Set steps per mm
M566 X1200.00 Y1200.00 Z1200.00 E40.00             ; Set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z18000.00 E5000.00        ; Set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z3000.00 E120.00            ; Set accelerations (mm/s^2)
M906 X1000.00 Y1000.00 Z1000.00 E500.00 I30        ; Set motor currents (mA) and motor idle factor in per cent

I also just figured out this:

M92 E820
M592 D0 A0.001246 B0.000406 T230

Do these seem reasonable? The max instanteous speed sounds low compared to one post above.

This is an upgraded mini kossel.