Rough surface and ocasional hole in the print

[Mirek]

Hi

I bought a "cheap" (well for someone) 3D printer for prototypes and iam trying to figure out the settings. The documentaton for the printer is really poorly made, the user manual is a joke, so iam seeking help on the internets.

My printer makes the surfaces really rough and bumpy, with ocasional small hole like this: [spoiler][/spoiler] If anyone would have an idea what causes this, it would be apreciated.

Material: ABS
Ex.Temp.: 230°
Surf.Temp.: 70°
Nozzle: 0,5
Layer:0.25 (awailable: 0.08, 0.125 or 0.25)
Fillament 90%honeycomb (or whatever it is called in english)

[Davo]

Check tension on the belt that moves in the axis from rear left of the photo to front right.

[Mirek]

YOu mean it might be loose?

[GOC]

- Its either a loose belt or loose hardware. This issue is that your getting an slight axis shift, this also can sometimes be caused by movement backlash if your speeds are too high (but I don't think that's your case ).

[jimc]

that also look typical of overextrusion.

[Davo]

But overflow should be equally evident on all sides.

[Mirek]

Ok so either i have loose belt, loose hardware or the printer is putting too much material there.
I tried to check the belt, but i have no tools to measure belt tension, so i only can feel it with my hand, and i dont think i have a loose belt.
About the loose hardware, as i said its a cheap printer. It shakes like an expensive dog when printing, so that might be a case.
As to speed and extrusion, i set everithing according to the User manual wich came with printer.
I have 0.5mm nozzle, printing with ABS.
My settings:
Layer thickness: 0.25
First layer height: 100%
Retract: 400 mm/s
retract Length: 1,5mm (it says 1,5-2mm for ABS)
Lift Z:0,6mm (lifts the extruder head during retract)
Extra lenght on restart:0.2mm (how much extra string is put to extruder after retract)
Minimum travel after retract: 2 mm
Solid Layers:6
Angle of infil:45°
Infil shape: Honeycomb
Infil shape of solid infil:concentric
Randomize starting point: yes

This part i dont understand so i left factory settings there:

primeter Print speed(mm/s or %): 50 (no idea if mm/s or %, i gues its mm/s unles you put the % symbol there)
small perimeters print speed (mm/s or %): 25
Infill(mm/s):60
solid infil(mm/s or %):60
Top solid infill (mm/s or %):50
bridges (mm/s):50
outer perimeter speed (mm/s or %): 20
travell:230mm/s
first layer speed: 50%

[sn00zerman]

I would lower your travel if your printer is "shaking" during print.
The travel-speed is the speed at which your printer moves, when not printing. (so, "in between" print-moves) I see you are printing at 50 & 60mm/s, so maybe lowering this "travel" to 100 mm/s to start with ...

[Mirek]

OK ill try. Thanks

[Davo]

Yeah, try travel at 115, see how that looks. If still not very clean, drop everything that is above 50 to 50.

Then keep dropping or increasing as needed, based on how your output looks.