RepRap firmware tuning

@dc42, My M305 config:

M305 P0 T22000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1

I use direct drive MK8 extruder with 0.4 mm diameter nozzel:

With other firmwares, I had β=3950, but I tried a range of extruder temperatures, ±15º C it doesn’t seems to make much difference.

The other temperature factor is that I am printing in a garage @ about 10º C .

The filament is some inexpensive ABS, the quality is not so good and I have to use higher extruding temperature for better layer bonding.

Veti

where did you get those values from?

i would certainly try pla first and calibrate your printer with that before trying abs

secretman

im fighiting this from i buy the maestro, i resolv almost all problem but i cant i just cant get rid of this retraction un retraction problem, if i print from sd card the inboard software its worst, i did the repetier emulator setting in the config, and print from repetier directly but still have this

i buy this board to get the last hair from perfect print and its a lot worst yesterday i reinstall my old mks gen1.1 and all get back where it was, a 20$ board prit better than this one .

i didint let go the maestro i want to get this to work but... no sleep night start to get me hahahah

you need to get extruder speed to the fastest you can first:

M566 X1000.00 Y1000.00 Z300.00 E5000.00 ; Set maximum instantaneous speed changes (mm/min)
M203 X18000 Y18000 Z1000 E10000 ; Set maximum speeds (mm/min)
M201 X3500 Y3500 Z300 E7200 ; Set accelerations (mm/s^2)

try this and report

I tried different settings, bellow are the results:

1- 245º C
2- 235º C

3- 245º C , settings recommended by secretman, retraction distance 4 mm, E188.48 steps per mm
4- 245º C , settings recommended by secretman, retraction distance 5 mm, E188.48 steps per mm

@secretman, your settings did some improvement in case 3 and 4. It seems kind of strange that increasing the retraction distance actually makes the undesirable artifacts larger.

secretman

@mitko said in RepRap firmware tuning:

.48

no the point was the speed u need to keep your step/mm setting
retraction 5 mm is a bowden setup i wanted you to just speed up de retraction and acceleration haha ur printing abs did you have the cooling fan on for your print?

secretman

@mitko
do you calibrate your extruder step /mm ? 10mm extrude 10 mm?
your square is square dimention are good?
cube 20x20x20 is realy 20x20x20?

@secretman , By changing the step/mm setting the intention was to see if it going to change something. In general the printer is calibrated. Well there are some deviations, for example instead of 10.00 mm got 10.06 mm for Y-axis, but this is related to the printer mechanics. The printer is a modified version of Graber i3, and there is some angle between the Y-motor and the belt bed holder, this seems to provide error.
But your speed settings are too fast for this printer, had problems today with the Z-axis.
Still I do not think that the issue is only associated with the retraction. I do not have cooling fan on the nozzel, because this material tends to deform very easily even from the extruder cooling fan.

secretman

@mitko
completly in accord with you its the retraction speed the problem, not only that but.... i dont understand why duet need to retract and undo with out moving.... stop retrac move undo retract then go... that why you need fasters speed ans accelaration and jerk for the extruder....

your dimention are ok then and

@secretman, not so clear. In general the G-code is linear, it is executed line by line. For example, I’m very displeased that I have to wait first my heated bed to reach the heating temperature, later the extruder. It is unclear to me how the G-code is executed in RepRap, if there is any look ahead or out of order execution optimization. To the best of my understanding currently only @dc42 can address those issues.

I tried today tuning the heaters, the extruder tuning went fine, but for the bed heater got:

2:27:07 PMWarning: Auto tune of heater 0 failed due to bad curve fit (A=71.2, C=303.0, D=-8.9)
2:22:27 PMAuto tune phase 3, peak temperature was 105.1
2:22:20 PMAuto tune phase 2, heater off
2:11:00 PMAuto tune phase 1, heater on
2:10:54 PMM303 H0 S105
Auto tuning heater 0 using target temperature 105.0°C and PWM 1.00 - do not leave printer unattended
2:08:27 PMWarning: Auto tune of heater 0 failed due to bad curve fit (A=112.3, C=532.3, D=-1.8)
2:00:19 PMAuto tune phase 3, peak temperature was 105.0
2:00:13 PMAuto tune phase 2, heater off
1:45:17 PMAuto tune phase 1, heater on
1:45:11 PMM303 H0 S105
Auto tuning heater 0 using target temperature 105.0°C and PWM 1.00 - do not leave printer unattended

secretman

i understand the part line by line but you can do a g01 in z and a e -5 in the same line, and you just get me to the point i will try this change all retraction same time as the move..... i dont know how repetier firmware work flawless and marlin too on my old crap ramp 1.4 board , and on the best one i just get farrr away of what i was still fighting the blob the retraction seam, patio slicer get better face quality but retraction problem is the same....

@dc42 i got a question did is better to enable the firmware retraction in the slicer ? if i print from sd i got worst peice, if i print from repetier i got better result but the retraction is not firmware enable

for the heater this part is easy:
For example, I’m very displeased that I have to wait first my heated bed to reach the heating temperature, later the extruder.

you need to cvhange in your software(slicer ) one command
M190: Wait for bed temperature to reach target temp
to M140: Set Bed Temperature (Fast)

easy enought but will start right away when the hotend get to temp

secretman

for your auto tune you need to add the setting to your config file for it to load
and if the bed is not pid you cant get it so work too...