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balden

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balden last won the day on September 24 2016

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  1. Hi all, I just had a case where I need to slow down the print speed at a given height for better bridging. In the past (maybe as early as Cura 15.04 but probably also with a previous 2.x version) I have successfully used Tweak-at-Z for such purpose. But for today's attempt with latest version 2.5.0, my Tweak-at-Z instructions don't seem to be really applied. I use Cura from the official AppImage under Linux OpenSuSE Leap 42.2, if that matters, and this is on an Ultimaker 2+ with default "fast print" settings. My exact settings: I tried to set print speed at 50% starting at layer number 379
  2. Thanks for the video Eraser. I feel like watching myself and my bearings mid-June. Be patient and you'll get rid of this jamming. It is worst when the rod is vertical because there is no load on the ball bearings so the balls start to skid easily when the least resistance is encountered along the ball races. At first I was able to jam the bushing even when the rod was horizontal, and then progressively the sole weight of the bushing would become sufficient to avoid the jamming in the horizontal and then increasingly oblique rod slopes (the bushing was able to roll back and forth freely and re
  3. Unfortunately, from France I have not been able to order from Misumi without a company ID. I haven't tried to order from Misumi US but as you say the shipping costs are likely to be a rip off (assuming they ever accept to ship outside North America). Anyway, I'll remember to check that possibility: after all I already uselessly invested in a couple of costly Igus polymer bearings which did not fit well and only made the situation worse ;-). About exercising the bearings: in my case, I made several runs over several days (probably cumulated about the equivalent of one continuous hour exercise
  4. Funny, there are definitely several ways to look at the same problem, kind of "chicken and egg" situation... I personally would say that a "perfect" nut does not exist (some amount of play is essential for the screw to run through the nut). So what you want is to lower the play in the nut to well below the layer resolution of the printer (for Ultimakers with 40 or 60 microns layers, I guess this translates to nut/screw tolerance below 10 microns or so... Clearly, the original Ultimaker parts do not reach this level of tolerance. I have no idea what the standard industrial tolerances are for s
  5. Looks like yet another case of sticking in the vertical linear bearings / rods. Short suggestions to remedy: add some weight (500-1000g) on the platform between the rods, wipe off any lubricant off the Z-rods (they should be dry and non slippery), remove the linear bearings and exercise them (a lot) by running them back and forth along the rods until the motion feels smooth and rolling (no skidding). If you find a good source of components, you could also try to replace the linear bearings with higher quality parts (Misumi parts have been recommended by some). See here (for example, but the
  6. Hi gr5. I think this is the same symptom here: in my opinion this phenomenon always revolves about the same factors : - slight play in the Z-stage screw/nut (probably almost unavoidable at 60 micron scale) - friction in the linear bearings (especially upon direction reversal after ~ 10-15 mm) My understanding of the phenomenon is as follows: depending on the variable friction and sticking along the rods, the Z screw/nut is EITHER retaining the platform from falling OR pushing it downwards, the Z-difference between those two conditions being the screw/nut play. Goo in the Z-screw threads wil
  7. OK here's some feedback about this. After the previous exchange, I gave my stock bearings another serious run of manual exercising, WD40 cleaning and degreasing cycles. Indeed one can feel the situation slowly becoming better, but it's a pain because it really takes a long time and a lot of patience. Following other advice in this thread, I also decided to add some weight (about 1 kg) between the pillars, which brought a big improvement. After that, I have been able to print the visually highest quality parts ever with my printer. However, since the bearings are still slightly sticking around
  8. I would like to mention FreeCAD. This is a very powerful set of tools under a single roof (possibly including the slicer engine although I personally prefer to use a standalone program for that). It is very actively developed and becoming increasingly powerful. For that kind of object (raised drawing), you can for example: import a bitmap image or picture of a model shape draft a B-spline curve on top of it convert this curve to a sketch (2D section for 3D operations) extrude or dig the sketch into a 3D solid object convert the solid object into a mesh and export it (STL...) for slici
  9. First, if you haven't already done so, I would systematically go through checking all the items in this troubleshooter chapter: http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#z-drop If the splitting always occurs at the same height (even not exactly the same layer but around the same height), my highest suspicion would still be with binding on the Z-axis and subsequent bed drop. There seems to be a significant fraction of printers out there with a tendency for the linear bearings to bind (albeit more frequently within the first 20mm at the bottom which doesn
  10. Thanks a lot for the link neotko. I laughed when I read chrisw's post about being unable to stop the Misumi bearing from rolling, even holding the shaft horizontally: my current bearings are definitely very very very different, even when I hold the shaft vertically, the bearings will not slide all the way under their own weight without sticking somewhere halfway. I agree that everything must play together but I was just saying that the root cause seems to be the bearings (at least in my case and for this particular problem of banding aroud 10-15 mm from the bottom). I may well end up adding a
  11. Hello all and first of all thanks a lot for all your excellent contributions and sharing your experiences, this is a great community. I, too, am having the same problem: frequently (about 50% of prints) one or very few bad layers, always around the same height (10-15mm from the bottom). I have had this problem from the very beginning 2 years ago (Ultimaker 2 delivered in April 2014). Until recently, stupid me, I thought it was due to some "magical" underextrusion phenomenon that would only occur at a certain height. I even bought the extrusion upgrade partly in the hope it would solve it, but
  12. Pardon me if this has already been brought up, but I am currently comparing the two branches of Cura and I am puzzled by some obvious differences with the new version : - the slicing seems much slower - the printing times are much higher (maybe related to the previous one) - the raft layers do not show in the layer view - the supporting structure seems sometimes questionably illogical - more oozing during travel (lots of "hair-like" filaments left on the way) Are these known features? Is this due to some configuration options? I have tried to set up both versions with equivalent settings
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