Hi, I have re-assembled effector and hot-end assembly after filing down the worm gear in the Nimble which was slightly oversized.

So this is embarassing,
I am now:
Unable to replicate the print finishes previously posted.
Unable to print at different speeds based on specified speeds in Cura, the wall speeds never seem to change. Only way I can change wall speed is during print on lcd console. I have no way of knowing what the true speed really is.
Tried slic3r, prints first layers at specified speed but still prints walls at low speed, even if i change every speed value to 100mm/s.
I dont know what i'm doing wrong here but its off topic, but makes troubleshooting impossible.

I have restrained wiring to nimble body, bound wiring to drive cable for about 250mm above Nimble and now have very good quality prints. Filing the worm gear I am sure has also helped tremendously.
Now the swaying of the drive cable is minimal, print quality is as good as with Bowden if not better.

I am still concerned that should the drive cable/wiring impose any horizontal force on the Nimble this will almost certainly affect the intended path of the nozzle. Only the slightest horizontal force at the top of the Nimble causes movement at nozzle in relation to cooling fan outlet, something is moving somewhere.

I really appreciate your assistance DjDemonD, I am pleased you could replicate the issue, your tests are certainly more accurate than mine so far!

I have attached 2 pics, one shows a steady print speed and even waves, the other I experimented changing speeds.
I don't remember print speed settings for these but typically i use a 40mm/s to start higher and i start to get issues on the corners. Thinking the flexing is contributing to all this maybe.

https://www.dropbox.com/s/q1k48nm7wrm82q2/even_waves.jpg?dl=0
https://www.dropbox.com/s/vx8cgxypcoya6zg/erratic_waves.jpg?dl=0

cant work out image insert, does wierd things!

Hi, its the 95cm drive cable, machine is 1m tall. No tight bends.

It takes very little to flex the effector, hold at the magballs and gently try and move to of nimble, i mean gently, i immediately see movement at the gap between the hotend and fan.

Im sure if I print slowly I'd not see any issues, but a little quicker and the sway of the drive gives wavy lines on the walls. Quicker i print worse it gets.

Hi there
I've been trying to use a nimble extruder on the smart effector but noticed with the offset drive mechanism the smart effector flexes near the mag mounts, as a result I get a wavy finish at best. Is anyone else running a nimble on a smart effector or suffering problems with flexing?
Thanks
Andrew

Hi, Just ran again at 0.8, ran sucessfully, no warnings. I tried to force error on temp increase and was unable to. Makes me think that just my bad calibration skills!

5:41:20 PMM307 H1
Heater 1 model: gain 384.2, time constant 279.9, dead time 2.8, max PWM 0.80, mode: PID
Computed PID parameters for setpoint change: P46.3, I0.166, D91.0
Computed PID parameters for load change: P46.3, I4.581, D91.0
5:39:30 PMAuto tune heater 1 completed in 510 sec
Use M307 H1 to see the result, or M500 to save the result in config-override.g
5:35:10 PMAuto tune phase 3, peak temperature was 241.8

That didnt go so well,

Auto tune cancelled because target temperature was not reached

Im running PT100's on bed and hotend

; PT100 Sensors
M305 P0 X200
M305 P1 X201

Ill run the M303 you suggested and see what results I get.

671 in config.g is incorrect its actually the same as in override now and was last tested with this value.

The heater is 40w 24v sourced from ooznest, or supposed to be!

The heater resistance is 20.2 ohms

At 24V its 30watts, if this method of calculation is accurate
Voltage (V)24 Volts (V)
Current (I)1.18812
Resistance (R)20.2
Power (P)28.51485 Watts (W)

At 12v, thats only 7watts
Voltage (V)12Volts (V)
Current (I)0.59406
Resistance (R)20.2
Power (P) 7.12871Watts (W)

My logic was this.
The heater heats the hot-end efficiently at a rate of 1 - 1.3 degrees per second.
While printing when the heater is close to temperature is slows down to avoid over temperature (I don't know how the firmware does this).
The rate of heat dissipation then becomes greater than the power applied or at least very borderline.
As a result the firmware, which expects or requires a temperature increase rate of at least 0.3 degrees per second reports a fault and the print process halts.
I also noted that the LCD and the web interface report a different degree per second value which is possibly relevant.

If this logic is correct, if I slow dowsn the print and reduce the rate of heat dissipation (less filament being extruded) then I suspect the
print wont fail and the hot-end will reach its required temperature.

Hi
Firmware Version: 1.20alpha7 (2017-09-24)

11:00:54 AMWarning: Tool 0 was not driven because its heater temperatures were not high enough or it has a heater fault
11:00:50 AMError: Heating fault on heater 1, temperature rising much more slowly than the expected 0.3°C/sec
Warning: Tool 0 was not driven because its heater temperatures were not high enough or it has a heater fault

This is taken from web interface, the error on the LCD actually states 0.2°C/sec not 0.3°C/sec oddly.

Thanks

Hi

I have a problem with my hot-end heater behavior, it occurs when printing at higher speeds but I can easily force the fault manually.

To reproduce this I start a print with hot-end at 200 degrees first layer.
Subsequent layers are at 180 degrees.
when back down to 180 if I manually change the hot-end temp back up to 200 degrees the fault occurs.

Observing the temperature rising, it rises rapidly to approx 196 then slows down so much that the fault occurs.

I have tuned the hotend with only:

M303 H1 S220, and saved with M500. I did get the "massively overpowered" warning.

This is a 24v system, 24v heater, E3D V6 Volcano, system firmware is:

Firmware Name: RepRapFirmware for Duet WiFi
Firmware Electronics: Duet WiFi 1.0
Firmware Version: 1.20alpha7 (2017-09-24)
WiFi Server Version: 1.19
Web Interface Version: 1.19.2

config.g
<snip>M307 H1 A561.3 C310.6 D4.3 S1.00 B0
<snip>override
<snip>; Heater model parameters
M307 H0 A111.4 C195.8 D1.6 S1.00 B0
M307 H1 A561.3 C310.6 D4.3 S1.00 B0
M307 H2 A250.0 C140.0 D5.5 S1.00 B0
…...
<snip>Any idea why this is happening?</snip></snip></snip></snip>