Can anyone help with these print quality issues
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I've been reading some threads on the forum and have started testing the different microstep modes.
I've found that x16 with no interpolation and there is a rhythmic gentle bumping coming from both z steppers, pulsing every ~0.31s.
Anyone care to guess what this is?
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you mean every 0.3 seconds you zaxis moves up a bit and back down again?
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@janko There's no visible jumping in the z axis.
I just mean that if I touch the frame of the machine I can feel a pulse ever 0.3s. I then felt around and found the source to be both z steppers (in parallel). If I touch the z steppers there's a rhythmic pulsing at x16 microstepping with no interpolation. Also there mildly at x32 and negligable from x64 upwards.
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@drammy in that way
The pulsing is i presume some vibration-ish you feel right? Or like a small electric flow (do you start dancing funny every 0.3 seconds when you touch it 
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@janko Yeah, that's it. It kinda feels the same as gently tapping the tip of your finger against the edge of a table (quickly
).
I can only dance funny! Or so my wife keeps telling me! -
@drammy some time ago i had some issues here, which i fixed by using x16 with interpolation. The movement is pretty much as smooth as i could wish for.
As of feeling the motors: tested it here and i can feel something but barely, not a level that i can imagine it would cause any issue.
For the oozing: i first configured my printer here to print straight lines, then started tuning the instantDV and acceleration. Last steps: in your slicer up travelspeed (helps bigtime against stringing) and start with retraction settings (there are some testfiles for that on thingiverse)
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@janko Till now, I've been using x16 with interpolation. It was only when doing this testing that I noticed x16 no interpolation causes the pulsing that was quite noticeable on touch.
Have nearly finished the test prints at each microstepping setting so will show some pics soon of the problems I'm trying to overcome.
Do you have any values for the things you're talking about - travel speed for example? Mine is set to 150mm/s..
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I've updated the OP and added some pictures of my test prints.
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- Id suggest you leave the motors at 1/16th with Interpolation to 256
- Have you calibrated the esteps per mm on your extruder motor ?
- On the X Y motors ?
- You're positive you have the correct esteps setting for your Z leadscrews ?
- This looks like extrusion calibration and retraction calibration ...
- Bowden or Direct drive extruder ?
A. Use "matts hub" extrusion calibration guide to make absolutely sure your extruder esteps are accurate, very accurate.
B. Make sure you have your extrusion multiplier in slicer set right.
C. Run some retraction test prints - share those pics
Find one that prints in under 45 mins ... this one scaled to 200% works pretty quick around 45 mins
D. Run X Y Z ... 20 mm cubes - share those - with your best retraction and Pressure advance settings. after C above.
E. <---- this should prolly be before C. ... run a temp tower on this material to find the near lowest possible temp you can print the material. Use that temp for the retraction tests and maybe even 5C less at the very tips of the retraction test model.
for now maybe run all these tests at 30-40 mms speeds [ 20 mms 1st layers, external perimeters at 50% of main speed setting ]
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Hey @sputnikoc3d
Thanks for the msg. In answer to your q's..
- list item Id suggest you leave the motors at 1/16th with Interpolation to 256
- Yeah, will do.
- Have you calibrated the esteps per mm on your extruder motor ?
- Yeah, I've run e calibrations a few times but happy to go over it again. Thanks for the link, it looks a good article!
- On the X Y motors ?
- Yes, I've found they were stepping a little over 100mm on the 100mm length test I ran and had adjusted these.
- You're positive you have the correct esteps setting for your Z leadscrews ?
- I believe so, it is a 8mm per revolution lead screw with a 1.8 degree stepper which at 1/16th should equal 400 steps. Have I got that wrong?
- This looks like extrusion calibration and retraction calibration ... Bowden or Direct drive extruder ?
- Direct drive (Flexion extruder and hot end) with e3d's 'Compant but Powerful' motor.
I've got some IGUS bearings and some anodised aluminium rods coming soon so I will put them on the printer and then look to run through the steps you've posted.
I noticed in the config.g the extruder max speed and acceleration looks high compared to the other steppers - is that right?
- list item Id suggest you leave the motors at 1/16th with Interpolation to 256
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; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Wed Jan 31 2018 09:50:41 GMT-0800 (Pacific Standard Time);---------------------------
; General preferences
;---------------------------
M111 S0 ; Debugging off
G21 ; Work in millimeters
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like Marlin
;M669 K0 ; Set Kinematics K=0=Cartesian
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X243 Y220 Z215 S0 ; Set axis maxima
;M208 X-15 Y-5 Z0 S1 ; [[ BuildTak ]] Set axis minima for the 220 x 220 Buildtak Bed
;M208 X215 Y215 Z215 S0 ; [[ BuildTak ]] Set axis maxima for the 220 x 220 Buildtak Bed
M564 H0 ; Permits ALL Axis movement prior to or without ANY Homing require [ over-rides default of no movement until all homed ];---------------------------
; Endstops
;---------------------------
M574 X1 Y1 S1 ; Set low-end [ min ] endstops || S1 = NC / Active High S0 = NO / Active Low
M574 Z2 S1 ; Set high-end [ max ] endstops || S1 = NC / Active High S0 = NO / Active Low;---------------------------
; Z Probe / BL Touch Smart
;---------------------------
M307 H3 A-1 C-1 D-1 ; *** Heater 3 *** PIN reassignment for 3.3v BL Touch SMART [ BL Touch Specific settings ]
M558 P9 X0 Y0 Z1 H5 F200 T6000 B1 A5 S0.02 ; Set probe type [P9] | Axis to probe[1=in use / 0=not used ] | [H5]dive height | [F5 ]Probe Speed | T=Travel Spd |A= #attpts | S= deviation
G31 X-29 Y-9 Z3.525 P25 ; Set X/Y Horiz offset from probe || Set Z probe trigger height || Trigger Sensitivity Value [ P ]
M557 X0:175 Y25:200 S25 ; Define the bed x/y min max mesh grid probing area for Mesh Bed Leveling
;M557 X0:175 Y25:200 S25 ; [[BuildTakSheet ]] Define the bed x/y min max mesh grid probing area for Mesh Bed Leveling;---------------------------
; Drives
;---------------------------
M584 X0 Y1 Z2:4 E3 P3 ; Dual Z Motor Mapping
M671 X0:175 Y100:100 S2 ; Z Lead Screw Leveling probe Point Mapping
M569 P0 S0 ; Drive 0 goes reverse [ X Axis ] [ S0 = Rev / S1 = FWD ]
M569 P1 S0 ; Drive 1 goes reverse [ Y Axis ]
M569 P2 S0 ; Drive 2 goes reverse [ Z Axis - LT ]
M569 P4 S0 ; Drive 4 goes reverse [ Z Axis - RT ]
M569 P3 S1 ; Drive 3 goes forward [ E0 ]
M572 D0 S0.06 ; Set Pressure Advance [ need to check Jerk and Accel Settings to properly coincide here ]
M350 X16 Y16 Z16:16 E16 I1 ; Configure microstepping with interpolation
M92 X100.30 Y100.250 Z1600:1600 E140.64 ; Set steps per mm
M566 X900 Y900 Z25:25 E250 ; [ Jerk Settings ] Set maximum instantaneous speed changes (mm/min)
M201 X500 Y500 Z280:280 E250 ; Set accelerations (mm/s^2)
M203 X6000 Y6000 Z280:280 E1200 ; Set maximum speeds (mm/min)
M906 X1600 Y1600 Z1600:1600 E1600 I30 ; Set motor currents (mA) and motor idle "power saving" decrease factor as percentage [ I30=30% ]
M84 S30 ; Set idle timeout -
I had an issue like this on my old Prusa, I changed settings, calibrated, tuned current, tweaked everything. In the end it was a mechanical problem. One of the horizontal rods that my x carriage rides on had come loose in the mount. I guess what I am trying to say is always look for the obvious first, sometimes we overlook the easy stuff because it looks to easy.
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Thanks guys!
I will put the new rods and bearings in and check all the mechanics then recalibrate (for the umpteenth time
) and report back. -
From what I see its definitely a rigidity / extrusion problem.
If you want to see significant alteration by changing interpolation you should test a complex gear in vase mode, but after checked rigidity and calibrate your extrusion.
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@hergonoway Ok, will play with microstepping after then.
I have had no end of problems with this Flexion extruder. Bought it about 4 months ago and the stock mk8 extruder gave me significantly better results.
Do you think I should be able to return it?
