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technicality

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Everything posted by technicality

  1. The fan cools the topmost layer to avoid the printhead 'pushing in' the next layer (because it is still soft). Print small-diameter towers or overhangs without fan are hard to do; the top layer will curl up at the edges and get the printhead to take the print with it or snap it off.
  2. Whoa awesome! Can we get some videos of this script in action?? Makerbot made some seriously awesome time-lapse footage of an ABP-equipped thingomatic printing out all the mendel parts one by one. Never mind that the ABP never worked for anyone else, it was a pretty awesome vid and I bet you'd get a lot of customers when they see that. Maybe you can put a little printed bulldozer on the side of the print head so the robots are removed more successfully? Here is an early attempt by me: It uses the front left screw to press against the robot. I never got the Gcode to loop well though (M
  3. I'm hoping they are just covering costs for the separate set. It doesn't seem right to make a profit on it...
  4. We have had some succes using the print head to push a finished print off off the bed and then starting a new one. We use a different tape than the standard blue one for this: Sigma ProGold. It sticks a lot less, but still enough when printing the first layer at moderate speed and with the fan off. When cooled it just pops off. We use a switching routine and copy/paste the 'main' g-code + switch a couple of times. See Our switch code: (printer just printed our part, is on top layer height of 34 mm) G1 F4200; set rapid speed for travel move G0 Z44 ;go up (actually just final print h
  5. Just press down the moveable part of the coupling, keep it pressed and then pull the tube out. If it doesn't come out with little force, try wiggling or a push-pull. You're more likely to break the (already faulty) bowden tube than the coupling, so you can use quite some force - be careful of the wooden part breaking though!
  6. I just made this animation that explains the 'classic' bowden plug: http://wiki.ultimaker.com/images/Bowden_plug.gif
  7. I whipped up an animation showing the forming of a bowden plug, for use in future discussions: http://wiki.ultimaker.com/images/Bowden_plug.gif I will probably write a wiki page about it and its causes, but thats not a priority right now
  8. Your print looks very shiny, an indicator of high temperature. You could safely drop it. In my experience the first thing that will go is layer bonding and after that you might have extrusion problems (slipping filament) because of high forces. Just lower the temperature so you still get good layer bonding. Too high temperature will not necessarily be bad for your print, but it might cause more stringing or problems because of heating up the filament too much and it plugging your PFA tube.
  9. I think he'd like to adjust the fan speed during runtime. I'm not sure, I'm lazy and spoiled due to the awesome Ulticontroller.
  10. The classic bowden plug is when there is still a gap between the PEEK/brass and the bowden tube. Molten plastic will come up (because of backflow: ) and stick to the PEEK. Because the PEEK is much cooler than the brass, the PLA will also solidify. EVen more plastic comes up, sticking to the other cooled plastic and thereby creating a plug. With ABS there is no backflow. Edit: there are some other options for slicing. You can use Cura, which is a nice front-end for a (modified) skeinforge. It uses printrun to communicate with the machine. And some people are using KISSlicer which seems
  11. Have you tried raising the temperature? Could be that the first two layers are being printed with slightly hotter PLA and then it cools down, to recover later. This could be (but hopefully isn't) a classic bowden plug.
  12. It could be exact enough, and looking at http://hackaday.com/2012/06/05/blu-ray- ... engraving/ it should be possible. It is however very dangerous to operate a laser without proper protection. Commercial machines use a filtering transparent panel...
  13. I've heard rumours (but not confirmed) that it may be to do with electric interference (?) in the endstop circuit (?). To fix this, you could compile a marlin with the option 'endstops only for homing' checked, at Daid's great Marlin builder: http://daid.eu/~daid/marlin_build/ If you have any questions about that procedure, just ask!
  14. Or maybe not all your pullies are tightened - though you would need to miss two pullies on the same belt for the effect to be really noticeable.
  15. I had the same problem, but then i turned up the potmeter (current setting) on the stepper drivers. I measured it and put them on 1.1A and it solved this issue for me. In my experience only machine which are running less smoothly have this problem.
  16. I can't see the image you are linking; because it is on your computer we cannot see it. You could upload it to http://imgur.com/ and then link it here. But if as you say the horseshoe clip fits snugly then this probably will not be your problem. Do you own any calipers to measure the outer diameter of the PFA tube? It might be too small...
  17. How far does the small white clamp stick out above the wooden plate? The chamfered hole might be too deep, that way the small white clamp doesn't work well. Could you maybe take a picture of the chamfered bit of your wooden plate? Example: http://i.imgur.com/jGYAB.png The left hole is how it should look, the right one is drilled too deep.
  18. Ah, thanks for clearing that up. I've seen that once before as well - I believe it's something either software or endstops should take care of automatically...
  19. Also, when you screw it back into place (with the bowden tube at the correct depth again) it helps to draw a line with a waterproof marker to indicate how deep the tube is put into the PEEK. So if it hangs again you can easily check for the bowden pop-up just by looking at it, instead of having to take the assambly apart again. Regards, Bart
  20. Is the diagonal cup supposed to be like that? Glad it worked out for you. As far as I know the motors themselves (coils, magnets, bearings etc) are rarely faulty - I am suspicious of the wiring though. It could be that the connector is not on properly or connections in the motor are borked. Did you return the motor or do you still have it? In the latter case, could you measure the resistance in the wire pairs? Maybe one of the pairs is broken. Checking for this would help in isolating the real problem.
  21. The best thing is to measure your filament (both along and perpendicular to the spool axis) with (digital) calipers. It's possible that one of these values is too large - it shouldn't be more than 2.90mm. At 3.00mm or over you will get a large amount of friction in the bowden tube, causing problems like the one you're having right now. I don't think you could deform filament to an oval to this point without thinking twice about the force you're putting on the screw. You will know that you're forcing it then. What do you mean by 'the printing head is getting stuck'? Does the extruder grind on
  22. Check if the holes in the pulleys are truly centered too, they could account for varying belt tension (meaning varying friction) and maybe even some kind of wobble?
  23. Im not familiar with the 'IKEA Ultimaker carrying bag', but at least it looks more professional It can handle the weight of an UM + roll of PLA (+one more, plus power adapter + UltiController) easily, without any sign of straining or breaking. The design does not rely on layer adhesion for strength.
  24. My first Thing on thingiverse: http://www.thingiverse.com/thing:22819 Martijn introduced me to the idea of mounting a handle in place of the Z-axis covers, so I made one. Decided on using square holes to prevent overhangs, not sure how round holes come out. Anyone got some experience with bigger (8mm diam.) round holes aligned with the print bed?
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