michelide

Hi All, Can anyone comment on this? I've now noticed it for other materials too. Really frustrating. Is there a way to turn the extruder head clearing during print off?

Hi All, I recently had to diagnose a very complex problem that I was having with a new material and at this point have been able to mostly fix the problem but still do not know the root cause of the problem. Perhaps you could comment and help me out. Excess nozzle pressure was causing the feeder to jam up to the point where it was digging into the filament and flexing it into an S. After trial and error with cura and and ultimaker 2+ firmware settings I went through about 8 meters of material on the spool. Cura settings that didn't seem to have any impact on this issue: Printing the first layer thicker Printing different layer thicknesses Printing at different speeds Printing at different temperatures in the material range Printing more than one model concurrently on the build plate Equalize filament flow (I still have it checked but checking it didn't fix this by itself) Slower layers, slower layers did not help, I've set slower layers to 0. Ultimaker 2+ firmware settings that didn't seem to have any impact on this issue Printing with TPU 95 material setting (it printed the same as custom setting) Print layers faster or slower I then started adjusting the flow rate at different times during printing and this didn't completely fix the problem it only mostly fixed the problem. I talked to form futura to get the recommended material settings for ultimaker 2+, I am working with an MD Flex Antimicrobial Nanocomposite material. Its a flexible 95A TPU. I was using recommended range of settings but still having issue. More temperature out of the material range would burn the material. No settings were clogging the material in the extruder. The flow out of the extruder was perfect when feeding without the build plate below it and very fast. The problem was only occurring when printing and only during 1 layer of printing. It didn't matter if a printed one or two models. I had the same problem on the same layer and every single time it caused the feeder to press too much pressure into the nozzle and caused damage to the material in the feeder. During the final moments before the material in the feeder would become damaged I noticed that the nozzle started pressing way too much material out it was spewing a foamy or bubbly mess, it always started on layer 3 or layer 4. This happened on every printing every time because pressure was building up in the nozzle between the initial layer and the fourth layer to the point of damaging the material. This is when I started adjusting the filament flow manually on the printer while it was printing and checking nozzle pressure in the extruder by manually bobbing the bowden tube while it was printing to determine at what point pressure was building up in the extruder. After the first 2-3 layers went down perfect no matter what above listed settings I saw that the pressure started building up in the nozzle. This pressure happened quicker with 100% filament flow and less quickly with 40% filament flow. After two layers at 40% filament flow I had to reduce the filament flow to 10% before the pressure started building up for one layer. During this 10% layer the printer still extruded less foamy and bubbly material but it was not as bad. Directly after this excess material ejection I set the flow back to 100% with no more issues. I've now printed 4 parts like with manually adjusting the flow settings with no feeder issues and I still have the problem on the 3rd or 4th layer where it seems something about either the GCode or the Printer firmware is trying to clear the nozzle during printing when it doesn't need to around the 3rd or 4th layer. Any ideas on how to fix this so I do not need to watch the print between layer 0 and layer 4?

I'm using an ultimaker 2 with a stock machine profile with cura 4.4 freshly installed and freshly updated firmware on the machine. My machine is also massively under extruding. Its like that either cura or the firmware thinks that i have an ultimaker 2+ machine even though I have selected ultimaker 2 in cura as my machine. There are some other strange problems in my setup also including that it is printing every other line for the bottom.

I guess I got both my ultimaker 2s before they removed the second hole from the fan plate, the aluminum block and plastic material feed through shell... It was quite a bit of work adapt the parts from the extruder upgrade kit and mix them with the original parts that were already on the machine...

bastienb I believe I might have already been able to to do what you are saying with tinkerware. I was able to print something with extruder 1 by itself without using extruder 2 then was able to print with extruder 2 without using extruder 1. My issue occured when I tried using both extruders in a single print. If you only need to use one extruder at a time for a print that is achievable with tinkerware without modifying start or end code. The only adjustments that I had to make to print with extruder 1 or extruder 2 were in cura by enabling an extruder and disabling an extruder with a custom FDM printer profile with marlin G code.

My print head is slamming into the front left of my machine between printing the first layer of extruder 1 and the skirt of extruder 2.

If there is no retraction the material will continue to heat in the extruder and melt out. If the retraction is too short an amount of material will still heat up and drip out. It seems that reducing the temperature slightly and retracting by an exact amount is necessary to keep the material of the not in use extruder from dripping all over the place. Do you think the red line could be because the material is slowly melting out of the extruder? The strange thing is that the red material seems like a somewhat even extrusion.

Is this a dual extruder print?

I'm still having issues on this subject but so far i've pieced together Extrusion upgrade kit (hardware) Tinkerware (firmware) Use Marlin GCode from Cura Make custom Start and End Code in cura Still trying to get tinkerware to work well with dual extrusion without having head travel issues. It could be start and end code that cura is inserting... Also If you upgrade your cura to 3.4.1 and delete the base printer cura thinks that it is corrupt and if you say yes to the window that pops up it will delete all your custom machine configurations that you create.

There are some tests that I did initially with my UM2 to learn about several important factors of printing to learn how to get things more dimensionally correct. One was by creating a 1cmx1cmx1cm cube then placing an array of 16 or 25 equally spaced cubes in cura on the print bed. This tested several things including: 1.) With current settings how accurate are the cubes individually and how different are they across the entire printing surface. You might note that your bed is slightly un level or that fanning causing different cubes end up slightly different because of fanning near a wall or that cubes near the front cool faster on one side because they are near the front opening of the machine. You may also note that the bed temp has slight variations across the entire surface which do not necessarily cause a great deal of change to happen but they do contribute to .01mm at times. 2.) You may also note how the material is printing and how sharp edges can get with the material. Edges can get pretty sharp. The original provided material is usually best to do this with as it should be the first material that you learn about. Some things you may also see is how when the fan goes on and the layers build the shrinkage of the material may change between the build plate and the currently layer. Usually low layers are exact then depending on the material you might see the wall shrink in slightly until you get to about 3-5 mm high (if you are using full fan right from the 2nd layer). Lower initial fan usually helps this and you only need full fan when you are trying to bridge from area to area. 3.) Between cubes you will also see how effective material pulls are and how they differ between layer heights, if it is leaving a trail if there are pull differences between the cubes and if there are differences between areas on the bed. I wouldn't recommend going all the way to the edge but go kinda close to the printable edge with each cube placement. I have been able to get resolutions that fit by placing offsets in 3D files that I created by +/- 0.008. I'm not sure if your parts have that built on or if they are exact edges. Without altering the file you could note that part areas that cool fast seem to have more shrinkage then slower cooling parts areas, smaller parts seem to shrink less than large parts (add more space between in infill with larger parts) one more thing that you can try is to turn off the fan and repeat the cube array print to see what happens with your material. You'll notice difference between printing with fan and without fan. You could also speed up the print slightly or reduce the extrusion speed slightly to thin down excessively thick walls.

Yes I now see M103 is not supported by marlin in the chart. Wow what a complication of GCODE!

I now see that reprap is a better source for G code reference than the marlin website and yes M103 is described on reprap as turning all extruders off. Thanks! M103 also causes extruder retraction as a default? M104 T1 S0 would be to set temp of extruder 1 to 0? M104 T2 S0 would be to set temp of extruder 2 to 0?

Hi tinkergnome, I am using Cura 3.4.1 with custom FDM printer with Marlin G Code (I also tried ultimaker 2 gcode with same result). I did not previously check the file but just did by find *X0*, then find *Y0* in notepad. It doesn't appear to have any. The file is also attached here (Block Alignment 4.gcode) and an image of the file. The start and end GCode that was placed in the file was default in cura 3.4.1. It wasn't something that I placed there. Block Alignment 4.gcode

For the M104 S0 ;extruder heater off This turns the last used extruder heater off? Does this also turn the other extruder hotend off?

Hi Nicolinux, Yes I did set GCode to Marlin but have been troubleshooting back and forth between Ultimaker 2 and Marlin. I will set to Marlin for the next test. I will give this a try for priming extruder 1 if I'd like to prime both extruders would I repeat this: G92 E0 G1 F400 E40 G92 E0 G1 F100 E10 Z7.0 F50 G92 E0 G1 X10 Y15 Z0.5 F500 G92 E0 G1 F9000 over again while replacing E0 with E1 (for extruder 2)?