myprinter
Posts: 52
Joined: Mon Mar 13, 2017 2:54 pm

Small play between perimeter, but only in the first few mm?

Small play between perimeter, but only in the first few mm?

I used a lot debugging time on this, and now i need some hints.

Ender3 S1 PRO, printed with PLA.

All my print is so nice and i think most wont see my problem as a problem.

When printing perimeter, i see the first few mm is a little thinner then the rest of the perimeter. It make small play between them but only in the first few mm.
All printed with NO retraction or other pull back of filament, and no move over surface.
You see it when changing direction as printing a cube (direction change 90 degree)

I have tested with, temperature, layer high, extrusion with, speed, jerk, and more, and nothing make any difference. It is exactly the same.

The extruder is calibrated and all print nice, just not the first few mm....

For med it look like the extruder is a little behind the move in x,y direction (under extrusion in the first few mm)

What can that be?
S3D-Jason
Posts: 1433
Joined: Sun May 31, 2015 6:01 am

Re: Small play between perimeter, but only in the first few mm?

Perhaps the extrude leaks filament when moving between islands or between layers. That means when it starts the next look there is already a small void in the nozzle. That causes the under extrusion for the first few millimeters.

You could try going to Edit Process Settings > Extruder tab > enable the "Use Retraction" option, but now enter a small positive value for the "Extra Restart Distance" setting. For example, if you have a 1mm retract distance, but a 0.3mm extra restart distance, then the extruder will retract 1mm prior to the move, but it will prime 1.3mm before the next loop. That can help avoid the under extrusion at the start of loops that you mentioned.
myprinter
Posts: 52
Joined: Mon Mar 13, 2017 2:54 pm

Re: Small play between perimeter, but only in the first few mm?

Nop because there is NO retraction at all.
All printed with NO retraction or other pull back of filament, and no move over surface.
You see it when changing direction as printing a cube (direction change 90 degree)
S3D-Jason
Posts: 1433
Joined: Sun May 31, 2015 6:01 am

Re: Small play between perimeter, but only in the first few mm?

The nozzle will still ooze even if there is no retraction. In fact, it may ooze more in that scenario!

I still think my prior suggestion would help. A positive extra restart distance would help counteract the oozing.
myprinter
Posts: 52
Joined: Mon Mar 13, 2017 2:54 pm

Re: Small play between perimeter, but only in the first few mm?

I will try it, but then i need retraction on every perimeter start, for the extra deretraction(extra restart distance) to work right?
S3D-Jason
Posts: 1433
Joined: Sun May 31, 2015 6:01 am

Re: Small play between perimeter, but only in the first few mm?

Yes, but you can make it a very small value if you want like 0.01mm. That way it will have negligible affect, but you can still enter a larger positive extra restart distance to ensure additional priming.

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