After Micro swiss DD upgrade,Extruder skips steps

[Veti]

increase the retraction distance until the stringing stops

[lui2004]

The retraction speed is ok ?

In the manual of micro swiss direct drive os wrotten maximum distance 1.5 and max speed 35 ,can i go higher without Problems?

[Veti]

print this
https://www.thingiverse.com/thing:2563909

until you get no stringing.

stay with that retraction speed for now

[lui2004]

@Veti which max distance i should 2.0 or 2.5 ?

[Veti]

@lui2004

go up in 0.25 increments until the stringing stops

[lui2004]

ok mate thanks

i still print the restraction stl

[lui2004]

@Veti i am now retraction distance of 3,5mm at stringing is always on prints

is 3.5mm to much for direct drive ?

[Veti]

@lui2004

M308 S1 P"e0temp" Y"thermistor" T100000 B3950 ; configure sensor 1 as thermistor on pin e0temp

did you change the thermistor when you switched to the micro swiss?
Are you sure B3950 is correct?

[lui2004]

@Veti yes i have changed it like in the docu like this:

i have changed only the bed its a silicon bed with 100k NTC3950

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                          ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B0 S1.00                               ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                        ; map heated bed to heater 0
M143 H0 S120                                   ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T98801 B4185 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                           ; create nozzle heater output on e0heat and map it to sensor 1
M143 H1 S300 								   ; set temperature limit for heater 1 to 300C
M307 H1 B0 S1.00           

[lui2004]

@Veti i have checked the marlin source and there is for hotend thermistor:

100k thermistor - best choice for EPCOS 100k (4.7k pullup)

is config correct ?

[Veti]

what temperature are you printing at? what material?

[lui2004]

@Veti 210°C its PLA

[Veti]

@lui2004

try printing at 200 and 190 and go down and start at 1 mm retraction again.

[lui2004]

@Veti ok

[Phaedrux]

You can try adding this command to your config.g M204 P500 T2000 which will maintain your current acceleration for print moves, but allow faster acceleration for travel moves. This can help a bit with oozing by shortening the time of the travel moves.

This would also be a good time to look into tuning pressure advance and double checking your extruder calibration.

3.5mm seems high for a direct drive. I would use the micro swiss recommendation of 1.5mm distance and 35mm/s speed for retraction, and then tune pressure advance. Since it's a direct drive a good starting value would be M572 D0 S0.05.

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

[lui2004]

@Phaedrux i can add it somewhere in the config ?

I will recheck the extruder tommorow

I will recheck the PA value my actual value is 0.15

Thanks

[Phaedrux]

Yes add to config.g

0.15 seems like a very high PA value for a direct drive extruder.

[lui2004]

@Phaedrux i have insert the lines you written.

Thats the result:

[Veti]

can you reduce the e steps by 10% and try again?

[lui2004]

@Veti no problem

with which temperature,what do you mean ?