Squashing Multiple MK4/2.71/5.1.2 Issues and horrible top layers - General discussion, announcements and releases

RE: Squashing Multiple MK4/2.71/5.1.2 Issues and horrible top layers

mixer3d — Mon, 29 Jan 2024 21:21:57 +0000

Hi, just to update i replaced the heatbed thermistor and seems that it solved my issues with error of the reading the temp. and real temp. and as a consequence detaching prints from plate. Heat bed thermistors had a difference of about 20k Ohms at room temperature. In practice now i can set 88-90 degrees and heatbed is around 85 (corners are always bit colder in MK3/MK4 according to support, in the mini heatbed temp. is more evenly distributed. So my factory assembled MK4 arrived with two broken thermistors (shrug), at least they send me spare parts... ;)

RE: Squashing Multiple MK4/2.71/5.1.2 Issues and horrible top layers

mixer3d — Fri, 12 Jan 2024 17:14:45 +0000

there is a new configuration for slicer, they change the flow rane for infills. besides i realized that in my printer i have false heatbed temp. reading, for about 15-20 C degrees, and after manully setting upmthe hotbed temp. to 100 it has around 80 so i can print PETG wittout issues with sticking to the plate, what is also important i don't need to offset now the Z layer, load cell works just fine

RE:

TMASlide — Sat, 06 Jan 2024 18:50:13 +0000

As a follow up. I assembled the MK4 with 5.0.1 firmware and had a little better results for the same print file, but not as good as the MK3. An older file NOT produced in 2.7.1 worked great, even with IS. I upped the firmware to 5.1.0 and went back to 2.7.0 for slicing and tried .gcode & .bgcode files with decent results. I've messed with perimeter, overhang and other settings and not seeing stringing like I was.

For a while I was thinking there was bridging issue causing warping and waves but I'm not seeing them on prints sliced in 2.7.0. So....I'm simply avoiding 2.7.1 for now and I am having satisfactory results on multiple files using the Input Shaper. I hope this continues and it would be interesting to hear if anyone else sees an improvements going back to 2.7. I'm still wondering if there were some 'ghosts' in the files that carried over into 2.7.1 files that affected results.

I'm going to update the new MK4 firmware to 5.1.2 since I'm 'feeling' like that is affecting the results. Hope I'm right.;-)

RE: Squashing Multiple MK4/2.71/5.1.2 Issues and horrible top layers

mixer3d — Thu, 04 Jan 2024 08:22:42 +0000

and joy did not last long, the last night print, fell miserably, again shifted layers, I have the first blob to remove ;)
so far i see some regularity in it, so every Nth print of the same plate will fail, on MINI where i can observe something similar sometimes, i mitigated it a bit by switching off the printer for a while between few successful cycles, because i observed that it happen more often when the printer is running for few days without switching off..

RE: Squashing Multiple MK4/2.71/5.1.2 Issues and horrible top layers

mixer3d — Wed, 03 Jan 2024 20:43:35 +0000

Hi, i wanted to confirm that replacement of thermistor solved the problem of "brittle petg". Also please notice that in room temp. around 22-24 degrees C, the resistance was similar, only when thermistor get hot, broken one changed the characteristic faster (at least i was able to observe/measure like described above).

Besides, i found a little uneven heating of the heatbed, so to solve the issue of detaching PETG from plate i tried to offset Z layer. First -.0.020, -0.030, 0.040, -0.050, and finally i set up 'default' for now -0.035, since then ~1km of PETG without issues. :)

RE: Squashing Multiple MK4/2.71/5.1.2 Issues and horrible top layers

Intveltr — Fri, 29 Dec 2023 19:31:44 +0000

I had similar issues with PETG detaching and warping. Adding a small Z-Offset to start closer to the plate helped, as did raising the bed temp a little and slowing the first layer down as well. Lately I am having decent success with the default profiles when I print on the PEI plate after wiping it down with Windex to help with releasing.

RE: Squashing Multiple MK4/2.71/5.1.2 Issues and horrible top layers

mixer3d — Fri, 29 Dec 2023 13:28:12 +0000

I mode another print, this time i limit the working space to be somehow similar to the MINI+ plate, so i cut corners to be closer to the center... And around 63% one object detached, this time in the center, but after second round i was able to cancel the object and it's still printing. What is important you can see only first 16 objects in the cancellation list, still when i pressed cancel button multiple times (i managed to do it in the second round of 52 objects ;) finally it worked, and so far so good, 83% done. Still seems that the first layer calibration is too gentle, on the textured plate i can se from the bottom perimeters, on mini i print the same object it's much less visible. So probably offset check or something like that will be able to improve it in the future.

RE: Squashing Multiple MK4/2.71/5.1.2 Issues and horrible top layers

mixer3d — Thu, 28 Dec 2023 22:28:09 +0000

so just in case you are curious PETG print failed again, (after some 2:30h, 40g) objects simply peeled off the board, Z offset was again too high, or it was too cold... no clue.

Besides, it turned out that the "object cancel" menu only works up to 16 objects, so I could not stop the first ones that peeled off which was over that...

RE:

TMASlide — Thu, 28 Dec 2023 21:19:28 +0000

Posted by: @fuchsr

I'm wondering if the input shaper is skipping something and possibly too fast???

I gave up on using IS with PETG, at least with the current firmware/default settings.

Starting a new project, importing the same stl file and slicing with the IS (2hrs) & PETG, the result was substantially better than the upper left images, but not quite as finished as the MK3S+ prints on the right. There are still some rough spots, however. This is perplexing but a little encouraging. Ghost in the machine?

Running another another PETG test without the IS (3 hrs).

I'm not sure why the thermistor would affect this problem since the final layer is 8mm above the heat bead....good luck on your problem, @mixer3d.

RE: Squashing Multiple MK4/2.71/5.1.2 Issues and horrible top layers

mixer3d — Thu, 28 Dec 2023 20:33:16 +0000

old thermistor on the left: