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Eraser

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Eraser last won the day on May 26 2016

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  • Country
    CA
  • 3D printer
    Ultimaker 2
  1. Thanks everyone for all your help! Misumi bearings installed successfully and it appears the problem is solved. Five prints so far without any issues.
  2. @rowiac and @neotko, Thanks so much guys. With the video and the assembly manual, I think I have everything I need. I'm going to give it a go tonight. Re: bearings. Misumi doesn't sell the value bearings in North America so I have the regular ones. They come package in a plastic bag inside a box, and there is actually a small pool of oil in the bag, so it's a lot of oil. I'm going to try following the Misumi instructions - degrease the oil and then apply lithium grease. Cheers!
  3. @neotko, Did you just install the bearings still covered with the Anti-Rust oil or did you use degreaser to remove that first? Can you give me a step-by-step on this "bed readjust one screw at a time" process you are referring to (or point me to a webpage or forum post)? I was not aware of this at all. I want to do it right. Thanks so much. ~Nick.
  4. I received my Misumi LHFSW12 bearings. The first thing I noticed is that the bearings are covered in oil. This concerned me, because I understand that lubrication can cause the bushing to slide instead of roll along the rail causing the very problem I am facing. So I did a little googling and found a Misumi spec sheet on the bushing. https://us.misumi-ec.com/pdf/fa/2012/p1_0265.pdf. This document says that the oil is Anti-Rust oil, and recommends degreasing the oil, applying Lithium soap based grease to the ball rows immediately, and then every 6 months. I am obviously not going to take apart the machine every 6 months to grease the bearings, but ignoring that, did other people apply grease the bearings before installing? Am I misreading something? Thanks guys! ~Nick.
  5. Thanks @rowiac. That's $100CAD. Getting a perfect nut sounds good, but I haven't found any advice on where to get one, or what make/model to look for. The Misumi bearings seem to come recommended by everyone. I am hopeful they will solve the problem. I'll find out in a week or two when they come.
  6. So, I did the following: Sprayed the bearings and rods with WD40 Exercised the bearings on the rods (up/down about 10mm) for 10mins each Sprayed the bearings and rods with degreaser Let degreaser work for 5 minutes Rinsed the bearings and rods with hot water Dried the bearings and rods with hair dryer Exercised the bearings on the rods (up/down about 10mm) for 10 mins each Then I repeated all of those steps again 2 more times. Unfortunately, my bearings are still jamming on reverse. I think there is some improvement, but I'm tired after doing this several hours, so I'm going to break down and order the Misumi bearings. Cheers
  7. Hi @balden, My experience is essentially identical to yours: 14 month old UM2 with UM2+ upgrade installed 3 months ago Bearings jam when reversing slowly. Can be overcome with force Jam seems to be avoided by torquing the bearings, or running them horizontally For the community's benefit, I have uploaded a video showing the jamming that occurs about 10mm after a slow reversal (which is where the layer skipping is happening) - password is "ultimaker" I WD40'd them. I don't have degreaser, but I'll go to the store and get some now. Its going to be a long day...
  8. Hi @balden thanks for the commentary. I very nearly ordered the Misumi bearings yesterday. At least the US Misumi site allows individuals to register and order - there is a company field to fill in but you can just write whatever you want there. It's still shipping to the address you provide. The problem for me is that I live in Canada and after exchange rate, taxes, shipping, brokerage fees (they use UPS to ship) it is going to cost me $100 for the two bearings. So today I am going to try cleaning and exercising the bearings really good. If that fails, I'll just have to eat the cost.
  9. Thanks @neotko I'll take a look at that.
  10. Thanks @rowiac - I am ordering some new Misumi bearings now. Is there a better z-nut I should order while I'm at it?
  11. Thanks guys. @Balden - damn that was a long thread to read through. I am going to try your suggestions and see if there is improvement.
  12. Hi Everyone, For a long time, I have experienced a singular layer showing under-extrusion in a print. See image below of the same part printed twice, the error occurring both times: Some troubleshooting information: The "layer error" occurs only sometimes (~50% chance) when printing the same part (from the same gcode file) multiple times. It has been getting more frequent lately (used to be ~10% chance). It is not an error in the model. The "layer error" occurs at around (but not exactly) the same Z-position (+- 1mm) between different prints. The "layer error" has different severities - sometimes it presents as a minor flaw, and sometimes it is quite serious (as in the photos above). Sometimes it causes the part to easily split along the underextruded layer I don't have a camera setup on my printer so I can't say for sure what is the cause. However, my best guess is that the bed is dropping too far when transitioning between layers. This suggests maybe there is some problem with the Z-screw or something related to the Z-screw. I have made sure there is plenty of the green lubrication gel on the screw. Does anyone recognize this problem? Any advice for correcting this problem? Thanks, ~Nick.
  13. I was having persistent problems with PLA warping and pulling off the print bed when printing large parts. I tried (individually, and in combinations): - raising nozzle temperature - raising print bed temperature - slow first print layer - thicker first print layer - disable fans for several layers - glue stick - releveling print bed - clean print bed with rubbing alcohol But I couldn't get a perfect result without any warping. Until now. Geert's salt method works amazing. Using it, I can drop the nozzle and print bed temperatures back to normal - which also improves print quality. I used it on a 9 hour print (that I had previously repeatedly aborted and restarted due to warping), and it printed flawlessly. Thanks Geert.
  14. I have now repeated the Aligning step of the UM2+ upgrade, now with the grub screw from Shop3D.ca on hand. It's early yet, but the machine audibly sounds like it is running smoother. Hopefully, there will be no more black dust forming.
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