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Jtp

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  1. Hi all, having recently installed the new Cura, I spent quite a while exploring the software and trying out the various new and re-imagined functions. I really liked the feature in version 15 that showed the projected cost of the part to print, and was encouraged that I could find the place to input the cost of the materials used. However, it is not as straightforward as I would have thought, and in fact it might not be possible, despite the settings appearing to be there. I've made a copy of a material, edited all the settings available, but the "Filament Cost", "Filament weight", "Filament length" and "Cost per Meter (approx) remain stubbornly un-editable. How can I put these values in? Is there any way to edit these settings at the moment, or is this a partially implemented feature? I hope there is a trick to this, or there is an expected update that will fix this issue? Cheers, Bill
  2. Having done a lot of prints very recently, many being fairly long in duration (up to 16 hours), I have noticed that there are quite a few things that can go wrong around the print head itself! On more than one occasion I have had a failed print due to under extrusion and there are two main problems that I have observed: 1: when you change the material, it heats up the filament to allow it to retract it all the way back down the bowden tube. Sometimes (not every time) it leaves a very fine string all the way back down to the hot end, which can snap at any point on it's length. I have found in the past that some of this fine string has been stuck in the bowden tube, adding just a little extra friction, which is really not helpful! You should make sure you blow out the tube with an air can from the hot end (detach obviously first from the hot end). 2: my UM2 gets dirt build up inside the hot end which needs cleaning out every 1/4 spool or so! I follow a set of instructions from "iMakr.com" which is my local supplier. The basics of the instructions is the you first remove the filament, then the bowden tube form the hot end. Then you heat up the hot end to 220 deg C, and when it is at temperature, insert a clean (not imprinted from the feeder wheel) piece of filament till it comes out of the nozzle. Then, with the filament still inserted, reduce the temperature of the head to 90 deg C. When temperature is reached, pull out the filament. If your hot end is dirty, it will come out with black or brown bits stuck to the filament. Repeat the process till the filament comes out without dirt. By checking these two things regularly, I keep my printer going almost without failure. There is the odd time when I haven't checked the nozzle in time and it's got dirty again, but cleaning it usually fixes it. I have also noticed a difference between suppliers! FormFutura PLA performs differently from Polymakr PolyPlus PLA, and requires different settings! I hope these suggestions help.
  3. I've just been looking into problems with under extrusion on my UM2. I'm using 220C at the head and 60 at the bed. What I did notice while printing (after very much adjusting and fiddling of the temps etc) was that there was a little buzz, every 5 seconds or so, from the back of the machine. Only by coincidence did I find out that this is the filament slipping in the feeder, and that this causes (strangely!) under extrusion! I have now adjusted the tension on my feeder, and the prints have improved, without changing the temps or speeds. It seems counter intuitive to me, but has actually made a difference. The other thing that I have observed, is that the same settings do not necessarily work for PLA from another manufacturer. I have now tried two, but the second was not successful, and I could not get as good prints from it, despite changing many settings to try to compensate. I hope these insights help. I would highly recommend http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#underextrusion as a great source of solutions.
  4. I've been successfully printing a lot of relatively large .stl files recently, but have noticed that the .amf files are not saving correctly. I import a 95,000KB stl file, save to gcode successfully, but when it comes to saving a .amf file it takes ages, and results in a 0KB file size. Can anyone help? At least I can print, but solving the problem would be good. Now using Cura 15.04.04 Cheers, Bill
  5. Are you sure the temps are re-setting? I was having a similar problem when I first received my UM2 but I changed the default temp for the PLA to set it a bit higher, and it has worked fine since. This is what I was told: "If you prefer a higher nozzle temperature for loading PLA, you can change the material settings in the 'Material' menu. Select 'customize', change the temperature (to 220ºC for example) and 'Store as preset'. You can either create a new custom profile, or select 'PLA' to change the standard PLA profile." Does that help? Bill
  6. Hi Guys, Thanks so much for the interesting messages. I have been in touch with Ultimaker via the ticket support system to try to get some official certification that the machine is safe to run unattended, but no-one seems to give that sort of direct answer. There are lots of documents and papers that have all sorts of compliance to various standards, but they don't give any sort of certification that it is fire safe. Is there anything that Ultimaker could send that might give that sort of certification that it is save to run unattended? I am thinking of building a perspex cover that will protect it from objects falling in to the open top, does anyone have any suggestions or recommendations of things that I should be aware of? Thanks again, Bill
  7. Hi All, I'm in the slightly irritating situation where the practice manager of the office where I have our Ultimaker2 printer has stipulated that we cannot print over night, or in situations where the printer is unattended (there must be someone responsible for the print in the building). This is mostly due to the risk of fire, but also due to the risk of someone being burnt by the hot elements. The risk of burning has been solved by putting a large sign up that says not to touch when in use, but the risk of fire is still to be resolved. This has led me to look at a number of solutions to the problem of print that will take longer that hours when it can be attended: First that we could build a ventilated (passive) over-case that would prevent anything from falling into the top of the Ultimaker2, accompanied by a door for the front to protect from anything getting in that way, thus making the printer safer to leave unattended; Second that we could stop a print when we needed to leave, and resume the print when we returned. The question I have is: Is it possible to stop a print, power down the printer, and resume the print job the next day? I hope some of the community can shed some light on the ideas above and help solve this problem that I have. Cheers, Bill
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