I'm newbie at this stackexchange and I have a "FlashForge Finder"; lately there are many problems with the horizontal surfaces quality (Bottom and Top at the same time).

As some issue guides suggests, I changed: number of solid layers, % of filling and extrusion multiplier; I use "Flashprint", so some concepts must be translated from Cura in the options menu.

P.S: All filaments are PLA.

Without any change: enter image description here enter image description here

After all changes (the "best") enter image description here

My settings for last black disk: enter image description here enter image description here enter image description here enter image description here enter image description here enter image description here enter image description here enter image description here enter image description here

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    $\begingroup$ Are you sure the E steps calibration is correct? it looks like underextrusion. You should edit the question with print speed, temperature, at least. $\endgroup$ – FarO Jun 11 '20 at 15:42
  • $\begingroup$ I'll see it and report the results $\endgroup$ – AJ MM Jun 11 '20 at 16:55
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    $\begingroup$ It could also be a clogged nozzle. $\endgroup$ – FarO Jun 11 '20 at 17:01
  • $\begingroup$ "E steps calibration" is not a thing you're supposed to do. OP does seem to have underextrusion, but there are all sorts of possible causes and not enough information in the question to identify one. $\endgroup$ – R.. GitHub STOP HELPING ICE Jun 11 '20 at 17:25
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    $\begingroup$ I see you have extrusion flow at 125% and still have serious underextrusion. Do you perhaps have the wrong filament diameter set? $\endgroup$ – R.. GitHub STOP HELPING ICE Jun 12 '20 at 5:58

This could be caused by under extrusion, often caused by the bed being too close to the hot end / extruder nozzle. You could try to relevel the bed, or change the screws so that the bed moves down slightly. Often when levelling, you want to feel slight resistance when sliding a piece of paper between the bed an the nozzle. You should do this for all 4 corners. Be careful though, you dont want the bed too far away from the nozzle, or problems maybe arise with the print not sticking to the bed.

Hope this helps, Luke.

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    $\begingroup$ @AJMM I would also recommend trying another 3D slicer such as Ultimaker Cura (ultimaker.com/software/ultimaker-cura). Also, where do you get your models from. If you make them yourself, try another CAD program, such as Fusion 360 (autodesk.co.uk/products/fusion-360/overview). It is free for hobbyists and non-commercial uses. See (autodesk.com/campaigns/fusion-360-for-hobbyists) for help. If you get them on the internet, try a 3d-printing specific model site such as Thingiverse (www.thingiverse.com). $\endgroup$ – LukeDunkley Jun 13 '20 at 14:24
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    $\begingroup$ @AJMM I have found some values for Cura. You can download from the Ultimaker website (a quick google search should bring it up. If not, let me know and I will give you the link.) You need to add a custom FFF printer. Then set the x/y/z width to 140. Make sure that origin at centre is checked, and the GCODE flavor is Marlin. Set the printhead settings to: X Min: 37mm, Y Min: 55mm, X Max: 37mm, Y Max: 55mm. Then set the gantry height to 28mm. Set the number of extruders to 1 and the filament size to 1.75. the nozzle size should be set to how big the nozzle is. Usually it is 0.4mm. $\endgroup$ – LukeDunkley Jun 14 '20 at 20:53
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    $\begingroup$ @AJMM Apologies for this being in multiple parts. It is due to the character limit. then set the start GCODE to: xgcode 1.0 ;start gcode M140 S0 M104 S{material_print_temperature} T0 M104 S0 T1 M107 G90 G28 M132 X Y Z A B G1 Z50.00 F400 G161 X Y F3300 M6 T0 M907 X100 Y100 Z40 A80 B20 M108 T0 G1 Z.20 F400 $\endgroup$ – LukeDunkley Jun 14 '20 at 20:55
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    $\begingroup$ @AJMM Then set the end GCODE to M104 S0 T0 G28 X Y M132 X Y Z A B G91 M18. $\endgroup$ – LukeDunkley Jun 14 '20 at 20:55
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    $\begingroup$ @AJMM In the project settings I enabled the visibility of the temperature setting and changed it to 220°C instead of the default 200°C and set the flow to 110% to smooth out prints. Check this website (labs.tomasino.org/flashforge-finder-with-cura) for all these instructions. Hope this helps. $\endgroup$ – LukeDunkley Jun 14 '20 at 20:56

Finally, I solved all faillures today.

-When the bed is too close from the hotend:

I cheat the machine with a cutter patterns board over the bed at the first extruder calibration; the distance increases several times and then You can do it shorter. enter image description here

-The another half part of bad quality [low maintenance of the hotend]:

As a good newbie, I didn't know the periods of maintenance and the hotend had much plastic waste the PTFE tube welded and burned at internal, so the only option was to replace it for another same or to upgrade to "All Metal"; I chosen to upgrade with the replacement and I'll more maintenance to this zone.

enter image description here

First attempt of trial piece: enter image description here ...PANIC!

But then and FINALLY! enter image description here Almost all correct, I can continue with my printings.

THANKS SO MUCH TO ALL, for your apportations and patience.

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    $\begingroup$ Glad to see you finally got it working! Luke. $\endgroup$ – LukeDunkley Jul 31 '20 at 11:50

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