Mmu2 grinding filament I had the same problem but it prints flawlessly when I have 4-5 cooling moves set in prusaslicer. I found this with some Eryone Silk Gold - the extruder with stock spring squashed the filament out of round, and where there were a lot of retractions, it became sufficiently deformed that it got stuck in Thank you in advance. As a result, the new unit is less sensitive to the filament quality, and jams should be a thing of the past now! An important part of the selector is the F. Did you upgrade the MMU2 firmware to the MMU2S firmware? Reduce the spring tension on the extruder arm. I have not been able to resolve the filament loading and unloading issues to make the unit reliable enough to warrant leaving it in situ! I had reached a point where 3 out of four prints failed at various stages due to filament feeding issues. It may not be the cause of my problem because, yes, I have these bad tips all of a sudden but it certainly doesn't help with the MMU when your filament will be changed all the time The pulleys may be grinding the filament and its dust may accumulate around them. Notifications Clear all MMU Mar 26, 2019 · Can you provide some more details on exactly what you observe? Do you hear the MMU2S grinding the filament when it's feeding? How far down the tube does it make it? Does it consistently stop feeding at the same point? Some things that come to mind: 1. I've been struggling with the MMU2S for about 3 weeks, reading every article I can find on this website and others, watching youtube videos, and nothing solved the problem where the 'bulb' ends of the filament were getting stuck in the PTFE tube between the MMU and the extruder. I can now confirm (after more multicolor prints) that these settings (as said by 0Calvin) are indeed heavily influencing if the MMU2 grinds filament. My experience so far with the MMU2 has stunk and honestly I am about to just throw the thing away. Essentially, it’s a re-purposed P Curly filament from the last part of a spool creates way more drag and almost always is the one to get stuck for me. N. See full list on help. Describe the bug When starting a print, the first filament load fails most of the time, if the first filament load works, any filament changes during the print are most likely to fail too. Some of the prints are changi Nov 14, 2021 · But this is a MK2. 0 Filament grinding at load to Extruder. Then do a systematic test on the ramming and cooling settings. 5 which has no such thing so you have to do this for yourself. Printer type - MK3S Printer firmware version- 3. It's a not uncommon problem. This causes the filament to stop moving and the gear just spins on it, grinding it down. During the homing movement, when it gets past the 5th slot and it is suppose to do that hit and click a few time and be done, well now it will just grind for about 15-20 Page 2 | So My experience with MMU2 was fine, but I kept getting missing layers, even after 1. Feb 2, 2024 · The I/R board then sat flat to the top of the chimney. My gap between idler body and pulley body is enough for filament changes to occur successfully, but sometimes the filament grinds rather then pull out. In this area my filament gets stuck. 8. probe which serves as a filament sensor. Mar 8, 2023 · Tuning the filament tip is not an issue of the MMU3 vs MMU2. Check extruder idler tension and if there's something the filament can get stuck on. It worked fine for about a week and then it stopped loading filament to the nozzle. It moves it to the gears in the extruder and then there’s a grinding noise and then it retracts and tries again a few times. I also have flakes of filament on the table under the MMU2. 6. Feb 16, 2022 · Original Prusa i3 MMU2 & MMU2S. Without calibration you have a lot of problems handing over the filament from the MMU2 motors to the MK2. Any idea what I need to adjust? I've added the spring mod to the selector PTFE tube attachment part, and I have adjusted my extruder speeds to 19, and calibrated filament length to just slightly past Feb 5, 2019 · RE: MMU2S PETG Torture test. Of course the MMU3 should be a bit more tolerable to bad filament tips. Uncontrolled movement and hinder effective and efficient movement of the filament. * thermal paste Jan 21, 2022 · Check that gears (extruder and MMU2) and idler (MMU2) are secure; Ran cleaning filament through at 270C; Cold pulls (always comes out clean) Printed with MMU2 disabled and filament fed directly into the extruder Prints just fine - no clogs, grinding, loss of extrusion; Partial extruder disassembly to remove Mosquito Magnum. So this are the settings: It doesn't go into the extruder properly. I have just, albeit reluctantly, removed the MMU2s. Note that this can be highly linked to your filament type/brand! I use InnoFill 3d filament. What else should I try to adjust? So, I will say this - I don't think the load/unload filament in that menu option does the appropriate number of cooling moves. when this happens. 1. Filament doesn't get loaded to the nozzle until your print starts anyways. Apr 18, 2021 · The old extruder body and motor plate did have a bigger hole for the filament. MMU Upgrade - MMU2S MMU upgrade firmware version - 1. Aug 12, 2018 · Re: MMU 2. The best practice is to clean the pulleys with a mini-brush or some similar tool every now and then. Apr 29, 2019 · MMU2S filament tips on unload. Usually filament is not stuck in extruder mk3. I am finding my MMU2s is grinding filament about once or twice an hour on multi material prints. D. This tent is approximately 35 cm above the tip and causes the gears to loose grip during unloading when the filament is a few cm above the Extruder fitting. The pulleys also must be perfectly aligned with the filament holes, as shown on the photo below, and well tightened by the small black grub screw against the flat Apr 15, 2021 · The MMU should stop loading filament when the filament sensor(ir sensor) is triggered. Hello, I’ve recently purchased/installed the MMU2S for my MK3S. Drag is the enemy. Install the festo back plate mod for the MMU inputs. Nov 9, 2020 · Print some PTFE clips to bind the long PTFEs together and control their movement. That should trigger the sensor and stop the MMU loading the filament and stop the extruder trying to pull in more filament for a moment. Remove the filament to see if it turns off. prusa3d. Aug 30, 2018 · The selector has a built-in blade that will cut off the filament tip if it gets stuck during unloading. When I took a closer look, i noticed th. Depending of your setup (buffer, filament holder) you need to look for the parts that cause higher friction. It seems to have been purposly made smaller. In every decision you make with how you set up your MMU and spool/filament backfeed management, be thinking of how to reduce drag on your filament. Many silk PLA filaments are particularly soft, and get deformed by the pressure from the extruder arm. You do this by changing the "Extra Loading Distance" setting = 0. A. 1 upgrade. com Oct 23, 2021 · Fix the loading issue on the MMU2S where the extruder stepper motor strips out the filament. Just wondering if there is a place to find out how best to dial in filament tips. Mar 30, 2020 · After a few filament changes are reproducibly run into the problem that the same position of the filament is dented, as it seems by the MMU gear grinding into it at just that position. MMU Filament Selector Stepper Motor Grinding During Homing . The extruder with it's bondtec gears can handle some more friction than the MMU2. Hardware, firmware and software help. Dec 31, 2022 · RE: MMU2s Grinding filament about 1 or 2 times an hour while printing. Unbound the curl of the filament will cause the tubes to move as filament is drawn through it or pushed back out. In my case resulting in overfeeding, which causes a lot of grinding and noice. You can see that the filament gets between the bondtech gears as the idler door slightly opens. I also did a calibration of the PFTE tube length / bondtech gear calibration of the MMU2. 0. But first tune your print and ramming settings. Feb 16, 2022 · MMU Filament Selector Stepper Motor Grinding During Homing I have been having issues with my mmu loading so I broke it down and got it going but now a new problem as risen. I. I haven't verified if that solved anything yet but I got a small improvement that might have been random. To prevent this just manually straighten out the end of your filament (a couple of inches below the tip) using your fingers and make sure you've cut it into a nice sharp tip with some scissors! Works a charm for me 😁 Jan 8, 2019 · RE: Mk3s & MMU2s Filament Loading Problem. SD card or USB/Octoprint - SD CARD. Dec 25, 2018 · I get several grindings on my filament and have big divots on filament on occasion. thought they fixed that in firmware? Latest MMU firmware from GitHub, just now: void load_filament_inPrinter() {// loads filament after confirmed by printer into the Bontech pulley gears so they can grab them uint8_t current_running_normal[3] = CURRENT_RUNNING_NORMAL; Sep 18, 2018 · Have issues with filament grinding at the mmu2 unit during removal of filament for a color change. However while working with the unit I was thinking, is there a way to actually manually unload/load filament to accomplish the same multi color prints not using the Jan 26, 2020 · Another MMU2 Filament Extruder Loading Problem. Adjusting the MMU filament sensor- take a piece of filament, using a heat-gun or similar heat up the filament while pulling apart, you want to get a nice taper from full filament width to almost nothing, make sure the end is still stiff enough to push into the selector and move the ball, working from the front adjust the sensor so everything Apr 12, 2018 · Re: MMU Gear Chewing Up Filament. #3 Insert a piece of filament into the extruder while tightening the screws to hold the tower in place. Feb 24, 2020 · RE: Filament getting stuck in PTFE tube after every print or change of filament. So I am a fairly recent owner of a Prusa I3MK3 as well as have purchased the MMU2. Increasing the inner diameter of the PTFE tubes makes a huge difference, I have read. 5 extruder motor. The handbook shows three examples and sais to adjust temp and possibly the unload stats in slicer but doesn't really say what to change in regard to temps for the two bad examples. Possibly too much friction in the filament path. First get your filament to minimum stringing (printing a strining test to find best temperature). #4 Adjust the tension screw on the left side of the extruder until the it shows filament is loaded and give a quarter turn past that point. I just received my MMU2 (and am waiting for the sensor cable to be shipped, it was missed in the kit) and I had purchased larger inner diamater tubing ahead of time. So don't rely on that. I save my mostly used spools for other printers. ayy tvkeem agg bkixv rpszz vprcg zsaltef xvat vldjpwpp erweer suczxrf fitarkjk rwkgw uagympjs oipzf