VladimirK
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Posts posted by VladimirK
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I guess I forgot how easily offended people are today and after seeing 2 words "switching" and "Prusa" most of them even wouldn't bother to even read the title to the end before turning into "go away!!!" mode. "<->" suppose to be arrows in both ways meaning that I'm switching there and back again depending from model. Maybe I'm already too old for that in my 50-th. For example last one issue are supports to nowhere that cannot be easily removed by support blocking in some models
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I thought you want to be "the best". But if not - I can understand.
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Cura:
pro: easily removable supportscontra: printing useless things, unfinished circles. For materials with low adhesion like HIPS (Ultrabase plus PvP glue, 105C printing bad) last thing is very annoying. For example for "Extruder base" body in https://a360.co/30W6v03 it prints unfinished circles and additional useless parts near for horizontal holes while Prusa do it properly.
Prusa:
contra: can't properly set dynamic cooling yet (sometime results worse than expected, sometime it doesn't cooling at all - halloween pumpkin PLA was quite terrible), problems of removing support
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For some reason the top of thread is flat while on preview before printing it is normal (symmetrical). First picture during print, second under microscope (bottom on the left), also attached gcode and stl. I've encountered that before, I thought it was problem related to HIPS, after switching to PLA preset everything was fine (it was about half year ago), but now I have it with PLA. What can cause that problem?
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It is designed for 0.8 mm nozzle, it suppose to be printed in one line. But unfortunately Cura have no idea what to do with it - with "Spiralize outer contour" it creates only one wall, without it separates roundings. While PrusaSlicer recognizing it and slicing properly.
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After changes. Lines there from "X" on the left, bottom at the bottom of photo. From left to right pressure advance 0.07 (was great with 0.4 nozzle), 0.035, PA disabled. It seems for 0.8 nozzle I need negative pressure advance?
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It works with 20Hz. From what I understood it makes temperature changes smooth: instead of jumping 6 degrees up and down it changes slowly.
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1
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By measuring with caliper it is both, slightly more plus slightly less. In extruder. Related to bed. No idea.
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Yes, it was hotbed settings. First I checked
M307 H0
Heater 0 model: gain 90.0, time constant 700.0, dead time 10.0, max PWM 1.00, calibration voltage 0.0, mode bang-bang, inverted no, frequency defaultIt was default settings. I tried to use PID before but turned it off due to errors with copper plated Volcano (heating it takes too long).
after tuning:
M307 H0
Heater 0 model: gain 237.8, time constant 782.6, dead time 13.4, max PWM 1.00, calibration voltage 24.3, mode PID, inverted no, frequency default
Computed PID parameters for setpoint change: P43.8, I0.427, D411.2
Computed PID parameters for load change: P4and saved in config-override.g as
M307 H0 A282.2 C416.3 D1.6 S1.00 V24.3 B0
That fixed problem, just as good as printed on cold bed. Further tuning PT100 to show proper temperature and tuning H1 show no significant difference.
I wonder why it happened at all, some precompensation in Duet?
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Yes, silicone heated 600W. So far I tried to change hotend thermistor from Semitec 104GT-2/104NT-4 (96 kOm at room temperature) to PT100 (110 Om) due to it less vulnerable to interference. Results are the same (first thermistor, second PT100)
In settings for bed I have only
; Heaters
M305 P0 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120CAnother options was (if it is related to hotend temperature to try copper plated Vocano due to higher inertia and twisted pair as thermistor cable). Not tried yet.
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Is it happens through thermistor? I have PT100 also (except it shows room temperature several degrees higher), can it fix it? Also when hotend further from hotbed difference looks the same, it doesn't diminish with height. Maybe I will try with PT100.
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Really it is related to hotbed, it is from 30C (failed, unstuck from Ultrabase), 50C and 70.
Only I cannot figure how exactly, hotbed powered through SSR MGR-1 D4825 25A DC Control AC DC-AC relay, it works even when I tried to limit control current with 1-5.6 kOm resistor, but print had the same issues. Also I checked power supply on board with multimeter - it is 24.0V when hotbed turned on or not.
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I will try today with 0.8, different bad temp etc, but if you think this happens due to bed power consumption - it is powered from 220V through solid state relay.
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I did PLA at 0.8 several weeks ago, was disappointed and changed back to 0.4 nozzle. But PLA settings was the same except line width settings, I opened Cura with stl, changed line width to 0.8, saved 3mf and made yet another gcode. It shows the same 17 minutes expected vs 23 minutes with 0.4, however not tested to print it right now yet again. If necessary I will test tomorrow. My 3D printer mechanic is "Anycubic 4Max Pro" (bed moving only up and down), 24V power supply, 400 steps per rotation, 256 microstepping, so most likely it is not related to mechanic.
A4_20mm_calibration_cube 0.8 PLA.3mf A4_20mm_calibration_cube 0.8 PLA.gcode
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There 3 files attached: original stl I used, 3mf saved from Cura and gcode file used (first picture).
20mm_calibration_cube.stl A4_20mm_calibration_cube nylon.gcode A4_20mm_calibration_cube.3mf
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I'm using Cura 4.6.1, Duet Wi-Fi, G-Code flavor RepRap, E3D Titan Aero direct extruder with Volcano,
M572 D0 S0.07 ; Pressure advance
My problems are on photos:
first one Nylon 0.4mm nozzle "Calibration cube"
Second is PLA 0.8mm nozzle, "Line Width" set to 0.8
I checked and those horizontal lines not at the same heights.
And it seems other models have no such problems (Polycarbonate, rotated 180 degrees)
Is it something wrong with Cura?
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Thanks!
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Yes, it helps, even with greater models it's fine even with 80% fan speed. And less problems with models curving for me due to it's cooling fast instead of after many layers as one chunk.
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I replaced my bed heater to silicone 600W from 220V and it heats up to 100+ in less than a minute, thermistor reports right temperature and "M190 S110" thinks the temperature is fine. However above heater I have sandwich from aluminum and glass, bed surface temperature at that moment near 90+ and 110 reaches only after +/- 5 minutes. So I put delay into "Start G-code" "G4 S300 ;wait 5 minutes". Everything is fine except all those time filament in extruder also at high temperature and some of them like PBT becomes brown, can become hard and block the nozzle.
Is this possible to automatically put delay into Cura produced G-code? I have
;Generated with Cura_SteamEngine 4.4.1
M140 S110 M105 M190 S110 M104 S260 M105 M109 S260 M82 ;absolute extrusion mode ; below from "Start G-code" G21 ;metric values G90 ;absolute positioning M82 ;set extruder to absolute mode M107 ;start with the fan off G28 X0 Y0 ;move X/Y to min endstops G28 Z0 ;move Z to min endstops G1 Z15.0 F60 ;move the platform down 15mm G92 E0 ;zero the extruded length G1 F200 E3 ;extrude 3mm of feed stock G92 E0 ;zero the extruded length again G1 F60 G4 S300 ;wait 5 minutes ;M117 Printing...and I would like to put delay G4 after "M190 S110" but before "M104 S260". I asked on Duet forum but there is no such feature in their firmware.
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I've tried to fix printing issue on small model that looks like that after printing
- there mess on the borders of the wall. I tried almost everything retraction related but nothing helped.
Then I noticed that walls are wobbling under extruder due to they are still soft and then I tried to turn on fan at 20% (7500 RPM max, one fan on the left from model on picture). Also I increased temperature by 5C to compensate cooling for layer adhesion. As you can see
left side of the walls are much better. There are many obvious issues including adhesion to raft of the bottom layer, but is it right way to do using fans for ABS (then I'm going to change to 2 fans) or is there some settings in Cura for these issues?
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Everything is fine with PLA, but with ABS/HIPS I have issues with first layer: distance from nozzle to bed already less than A4 paper thickness, HIPS sticks to Anycubic Ultrabase just fine, I have problems to remove it after cooling, but unfortunately both materials not very bed-friendly. HIPS sticks just fine with continuous lines, but for some reason Cura trying to make some small lines inside of circles and making future holes by making one line, abandoning it and returning later. On screenshot Cura first layer making order. As you can see it started hole with small lines in the middle and continued later. HIPS sticks to bed after several millimeters of curving. And as result my first layer in HIPS looks terrible and print was cancelled due to that.
Is there option to make first layer in one run? I've tried to reduce "First layer speed" from 50 to 20 but result was not much better.
Reasons why I swithcing Cura <-> Prusa slicer
in UltiMaker Cura
Posted · Edited by VladimirK
Where I said that? There is no horizontal arrows in alphabet, "switching Cura <-> Prusa" suppose to mean in both directions.
Next time I'll try to report on github, I thought this forum related to Cura.