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  1. First print with PP on UM3E - impressive

    Ive been printing with PP all week now, it is a bear! When it works, it does make some nice prints (I print for work, I am using the PP for these glue templates so that when they get too caked up with adhesive, we can just soak them in solvent). I have had it start to tangle in the extrude gear a few times, and other times the nozzle clogs up. But no adhesion issues, thanks do those fancy UM adhesion sheets. :-) I have had the most success printing at 40mm/s and no retraction, with no other significant changes to the profile.
  2. I would recommend getting the 3D Solex HardCore, which allows you to replace the nozzles. It is very difficult to replace a nozzle on the OEM Ultimaker 3 Cores.
  3. For some reason, cura connect (Show Print Jobs) is showing not only the wrong print job, but a job that I did about a week ago. I figured after a few reboots it would go away. I even cleared my browser cookies/cache just in case. Does anyone know how to get this to reset? UM3, Cura 3, Google Chrome, WiFi printing Edit: Just to clarify, this is the "Show Print Jobs" on the webpage using google chrome. the Windows 10 desktop app Cura 3.2 shows the correct information.
  4. Carbon Fibre with PVA on UM3

    3D Solex has a "HardCore" nozzle/core system for the UM3. Their standard nozzles are still brass, but you can buy a hardened nozzle for the system as well. this guy has everything you need: https://thegr5store.com/store/
  5. Polypropylene Issues

    I searched around the forums and could not find much information on my particular issue. I have UM brand Polypropylene and I simply cannot get a part to print well. I am using UM adhesion sheets, which are amazing, and do NOT have any bed adhesion problems. However, after the first 10-20 layers or so the nozzle starts to clog and I get severe under extrusion that results in just little wisps coming out of the nozzle. I started with all Ultimaker defaults, increased temp, lower temp, 0.1mm and 0.2mm layers, 30mm/s speed, 70mm/s speed. The filament doesn't make any popping noises or anything, so I don't *think* its wet (and it was brand new out of the package). I even cleaned out the extruder cooling fan to ensure air flow, and cleaned the nozzle really well (cold pulls, etc). Has anyone else come across this problem? I am running an UM3, AA0.4 Core, Cura 3.2 Edit: the underextrusion I am describing looks like this guys prints (except I am printing PP)
  6. Getting Better Dimensional Accuracy - Calibration

    Right on, thanks for looking into it. I definitely suspect I am creeping up the capabilities of FDM printing, it just seems to me that it is consistence enough that software could compensate so I was hoping there was already a setting built in that I had not yet discovered. I will update if I come across any other clever solutions.
  7. Getting Better Dimensional Accuracy - Calibration

    Busy day today, but finally got around to posting. @yellowshark I ran a PLA part today for better comparison purposes, pictures are below. My OD numbers are actually pretty close, I measured 0.13mm oversized, but the part was 0.25mm oversized at the bottom. (indicating taper, I suspect this is plastic shrinkage). The ID was measuring 0.4mm undersized. I ran (4) walls, 20% infill. I will try (2) walls on Monday and see if that changes it. If I recal, I had printed some test cubes a while back that had 1, 2, 3, and 4 walls and I noticed that 1 wall measured perfect, and 2 walls was the same as 4 walls as far as oversized. But I will try again on Monday. @SandervG I would say it is more or less consistent, I do notice a slight difference between X and Y of less than 0.005" (.13mm) but maybe this is as good as it can be? I have checked the belts, on Monday I will measure for square and report back. I have Cura 3.2.1 Project file attached. UM3_111222_dowel_fixture.curaproject.3mf
  8. Getting Better Dimensional Accuracy - Calibration

    Awesome! The dimension should be 1.852" or 47.04mm. I am printing a boatload of calibration cubes this afternoon to try and see how exactly some of the settings affect the parts. So I will post this information later on as well. The attached "cube" is 1.500" (38.1mm) square, with a square hole that is 0.600" (15.24mm). test cube 2.stl
  9. Getting Better Dimensional Accuracy - Calibration

    I think we are not on the same page regarding scaling, so I have attached a screenshot of Cura with the part scaled to the correct size. The dimensions should read 57.1x57.1x25.4mm. The small hold inside of the part is 6.15mm in diameter, but measures 5.77mm. To be fair, I am not too worried about this particular hole, but I am worried about the larger inner diameter shape on top of the part. For some reason, the "Horizontal Expansion" option does not adjust this wall, so even though I can get the outside of the part correct, and the "square" hole correct, the upper lip does not compensate for some reason. I have tested the nozzle by printing a calibration cube with 0% infill and (1) wall. Then measured with width with calipers. Width in Cura is set to 0.35mm and I measured almost exactly 0.35mm. I am printing another test cube right now with the "Outer Wall Line Width" setting changed from 0.35 to 0.25mm just to see what happens.
  10. Getting Better Dimensional Accuracy - Calibration

    Good catch, its in Standard units. So it needs to be scaled by 2.54. The numbers in Cura 3 match up.
  11. There are a few other topics floating around that discuss accuracy and calibration of the printers, but my issue seems to be above and beyond. First off, I am running a UM3 with 0.4mm Cores, mostly MatterHackers PRO PLA and PRO Nylon material. The issue is that my parts are consistently 0.010" (0.25mm) over size on outside dimensions (OD/PIN), and 0.015" on inside dimensions (ID/HOLE). I have spent a lot of time printing calibration cubes and if I print a single wall cube with 0% infill, my print comes out perfect - as in, +/-0.001 with the occasional 0.005 outlier - but I can live with that, this is a CNC machine. However, as soon as I add multiple walls, the part grows (consistently) to +0.010 overall. This is true for 2 walls, 3, 4, and so on. I can print 6+ walls with the same result. Since the single wall part prints perfect, I have to assume that my material calibration is correct - right? Hopefully this describes the issue thoroughly enough. To combat this issue I have tried: -->negative horizontal expansion This *sometimes* works, but some surfaces (typically inner diameters) and angled surfaces do not get adjusted, so they end up being oversized pins and undersized holes if the surface is not perfectly vertical. --> outer before inner walls this helps, but does not seem to do enough --> adjusting line width I have 0.4mm cores, which default to 0.35 line width. lowered it a few 0.01mm increments with no success. This seems obvious to me since cura just shifts the shell thickness over and you are left with the same "over extrusion" --> Model parts with 0.010" smaller pins, and 0.015" larger holes works, but is pretty inefficient. A lot of the jigs and fixtures I print are typically meant to be machined, but we have been trying to print them in order to save some machine time. Not everything needs to be made from metal. If we know this ahead of time, I can make sure the parts are designed with extra clearance, but this is not always so easy. --> adjust flow rate This is obviously not a good solution, but I tried it and its pretty tough to dial it in and of course underextrusion results in weaker parts I want to point out (again) that I understand this is not a CNC machine milling metal and that +/-0.005" is asking a lot of a printer. however, this parts are consistently oversized, so I feel that there is some tuning or Cura setting that could be changed to compensate for this. Some part that require extra precision will be post machined with a single pass or something, not a big deal, but I dont want to do this with ever single part - kind of defeats the purpose. Sorry for the long post, but I wanted to be thorough. Any suggestions are greatly appreciated. 111222_dowel_fixture.stl
  12. UM3 - Total Run Time

    I was trying to find a way to determine how many hours total my UM3 has been running. I found the page where it says how much time each printer Core has been running, but unless I plug in each core, and make an estimate of which core was running while the other core was waiting....I don't have a good way of figuring out the total runtime. I understand maybe this is not the most important piece of data to collect, but every other printer I have used has this information - so maybe I am missing something? I use this printer for work purposes, so it would be somewhat useful to know total hours run its lifetime or from year to year for possible budgeting purposes, or convincing management that we use it alot, etc.
  13. OH man, this is perfect, I also have the same issue, replacing the spring with one from another UM3 core solved the issue, but I would like to get another (better) spring if possible so that I can re-assembly my UM3 printcore. Does anyone have contact information for 3D Solex. (Carl?). it doesnt appear to be on their website for some strange reason....

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