Loud nois filament change  

RE:

Hi @nils-ru

how does the filament look like? Is not ground on some part with gears? It would show, that the filament is stalled in the nozzle and cannot be unloaded.

Using bondtech you do not experience underextrusion?

How about the extruder idler?

Try to use a bit higher temperature (+5 - 10°C)

RE: Loud nois filament change

Hi Zoltan,

for the bondtech extruder I changed the Steps to E92 E415 in the Start G-Code > no under or overextrusion

My start g-code:

G90 ; use absolute coordinates
M83 ; extruder relative mode
M104 S170 ; set extruder temp for bed leveling
M140 S[first_layer_bed_temperature] ; set bed temp
M109 R170 ; wait for bed leveling temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
G28 ; home all without mesh bed level
G29 ; mesh bed leveling 
M104 S[first_layer_temperature] ; set extruder temp
G92 E0.0
G1 Y-2.0 X179 F2400
G1 Z3 F720
M109 S[first_layer_temperature] ; wait for extruder temp

M301 P13.54 I0.98 D46.58 ; Bondtech heatbreak
M92 E415 ; Bondtech Exruder

; intro line
G1 X170 F1000
G1 Z0.2 F720
G1 X110.0 E8.0 F900
G1 X40.0 E10.0 F700
G92 E0.0

M221 S95 ; set flow

filament looks good, no filament grind. All printing works totally fine.

What do you mean with extruder idler? I think the extruder itself has no problem at all.

As I said the loude noise appears only on filamentchange when I print before. No probelms while printing no problems on filamentchange before printing when printer frelshly reboots before.

So I think a temperature change would not change anythink. The filament "pull out" of the nozzle and heatbreak with the extruder works great. The loude noise happens with loading and deloading after printing something not instandly as on the video shown.

Do you think the problem can have something to do with slicer settings the Start G-Code fore example?

Thanks for you help

RE:

I guess the strange noise comes from a motor, does not?

After the print is paused the extruder starts the unload 

1. first extrudes a bit in order to release the filament - you can see the filamnet coming out of the nozzle

2. starts the unload and then the "fast" unload -  during this fast unload the filament should move fully outside the extruder.

3. does it move at all ? if so how much? - the fast unload is just moving a specific number of spins (based on the length of the PTFE tube), so if the filament is locked for while (by any reason) the motor either skips some steps (equipped by strange sound) or is grinding the filament, which you should see as a gear marks on the filament. The end result of it is, the filament is not comming out of the gears.

4. not sure the power of the fast unload is same as a normal - checked - it is equal

RE: Loud nois filament change

Yes, the probelm occurs while "fast" unloading or "fast" loading.

When I untighten the filament ideler screw allmost to the end, I dont't have the loude sound and the filament does not got stuck. But with this setup the extruder could not feed the filament reliable 🙁 I think the extruder extruder motor does not have (not anymore?) enough torque.
Is this a think, that a stepper motor looses torque? I am thinking to just replace the extruder motor

RE:

If the filament extrudes during print correctly i do not think the motor is faulty.