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Everything posted by msurunner

  1. No you do not need to go to 1.75, just slow it down a bit. I would echo illuminarti on switching to a different extruder if I was to go to a 1.75.
  2. 75 micron layers for my best prints. I've done a couple 20/25 micron layers and there just isn't enough resolution difference to justify 3 times the print duration. In fact, I like the surface quality of 75 microns better as it allows for a slightly more controlled extrusion the the insanely small layers provide.
  3. That would be my guess. I see that from time to time on my prints. Usually seems to be a by product of either being slightly off on filament settings (either too cold or slightly over extruding, generating pressure on the extruder eventually) or too tight of a coil on the filament generating too much friction in the bowden. Try cleaning the drive bolt and check to make sure there aren't any straggler dust/grind particles or filament threads in the bowden tube and bump the temp up a bit if you notice it mid-print.
  4. Here's my opinion on the matter, FWIW. If you are planning on a multiple hotend setup, a 1.75mm filament is better for the fact that the smaller diameter filament/bowden acts as less of a spring force against the positioning system. For a single hotend setup, I would prefer a 3mm setup for the following reasons. There is less surface area to volume on a 3mm, meaning that for x volume of plastic you will receive slightly less friction force to overcome in the bowden tube. It also acts as a slightly larger plunger/ram in the semi-hydraulic system that we essentially create. While I don't ha
  5. I opened up one of my old nozzles from the V1 setup by taking a piece of heater barrel and screwing it into the old nozzle with a second nut to act as a captive force to allow me to remove it. The only thing you really need to be careful to do is to file little bit of heater bore flat and smooth to allow for a good mating surface.
  6. Perhaps the biggest question is what is leading you towards attempting to produce your UM versus some of the various other designs out there? Are you a fan of the highly touted precision or the highly touted speed? To increase one kinda decreases the other unless you want to spend more... If you are looking to build as precise of a machine as possible, then yes, go ahead and buy the .9* step motors, alter the firmware (x/y steps/mm and lower the max acceleration and jerk settings) and print slowly enough to realize some benefit (FWIW, I think it's going to be minimal). If you want to be abl
  7. Fundamentally speaking, yes, .9* steppers are more precise by a factor of two. Now, are you going to realize the added precision in actually prints? Most likely not a whole lot, especially if you want to print with speed. Microstepping 1.8* steppers still provides a very precise movement that is actually more likely limited by belts/belt tension than the stepping.
  8. Cable stretch introduces backlash, and backlash contributes to a number of problems including fills not properly filling, and dimensions not correctly printing. Honestly, the best means of "simplifying" for the sake of accuracy that I've been able to uncover is SG's direct drive conversion. The other option you would have would be to modify the gear ratios of the pulleys, but that has consequences on speed. For what it provides, the UM is a highly accurate FDM printer. If you need more accuracy than what a well built and calibrate UM provides, you likely need to consider some sort of SLS o
  9. I have been thinking that one of those camping mattress inflatable pumps would be a decent means of moving a lot of air quickly and it's already designed to work with some sort of tubing setup. I'm assuming that's similar to what you have running on your's foehnsturm? BTW, I'm getting our budget numbers shortly and then I think I can order up a set of those pulleys if you're doing another order...
  10. What's with the new extruder on the UM2? Direct drive from the stepper? Are we getting an upgrade option? Also looks like the blocks were changed and the center section for the print head as well... Can we get some more detailed pics?????
  11. I use a similar tape (another application tape) called ApliTape on parts that have difficulty adhering. It's relatively cheap and really quick to set up. Pull out ~8" and slap it on.
  12. Yeah, the Eiffel Tower requires your retraction to be dialed in well. Print a couple hollow pyramid calibration cubes/pyramids to get your retraction where you want it before attempting unless you are extremely confident and ambitious! Yoda is a fun one to print that doesn't require a lot of work to print well aside from getting your temp settings close (important for retraction as well) and it can be printed without infill and 3 perimeters.
  13. ^Same, and after a while the standard brim becomes enough to gauge.
  14. 9/10 it is the pulley on the stepper motor the small belts are connected to. You could test that by making an index mark on the pulley and stepper motor shaft with a pen and seeing if it has slipped after a print (obviously just do a small one to see so you aren't wasting plastic).
  15. As much as I'd hate to blame the board, that's where I'm inclined to lean now...
  16. Was the part flat across the bottom? If so your first layer looks like it's fine and your bed is level.
  17. I simply look at the skirt, that's why I was critical of those two areas in the skirt. Making the skirt further from the part and multiple lines give you a bit more time and distance to eyeball it. As the skirt is printing I adjust the screws as needed. This tends to work very well as I'm usually within a half turn on at most two screws from part to part. Plus, going all crazy with a dial or feeler gauge is faaaaar too time consuming in my opinion for what I'm doing because the only way it would be relevant would be to do it before EVERY part as every time you take one off the build platform
  18. Reflashing the firmware will reset the memory AFIK, so you don't have to delete anything. It's been a couple months since I was super active (school teacher enjoying summer break) but when I left, Daid's Marlin-builder was down temporarily as he was working on dual extrusion and Cura upgrades. It may be back online and someone can link to it here, or the old link (search "Marlin builder") may still be the active download location. If not, you could search for an older version of Cura (version 12 is still available in the older/testing downloads section) and seeing if it's a package thing, t
  19. Like I said, you really are very close, I was just nitpicking! If I was to suggest something more substantial I would say try to limit the stringing (that stuff inside the holes) by turning your speed up a notch and seeing how that affects things. There are a couple more things that you can try with regards to retraction, but on such a small spread, speed would be my first move.
  20. He did say he used some wider tape, but yes, it's pretty darn close to "correct" and the part obviously made it so it's "close enough" I was just thinking perhaps a quarter/half of a turn down on the screw that's in the top left and a quarter/half turn up on bottom right.
  21. Thanks Looking at the inconsistency of the skirt line, I would say you have some slight bed level issues. Bottom right looks too low (looks like the extrusion slid across the tape) while the top left looks too high (extrusion color change indicating the layer is slightly thinner there). Obviously the part printed and stuck to the bed so you are very close on that and any issues after the first two layers are going to be something you are going to want to adjust in the slicer, with either speed or jumping into the advanced settings.
  22. That's actually kind of the thought process behind how Daid named the program. Okay Martin, So you confirmed that the switch IS actually interrupting/connecting current flow? I would think that the simple solution to get you up and running immediately would be to swap limit switches from the bottom limiter to the one in question and see if that "solves" the problem. If it doesn't, then there is likely an issue somewhere in the cable/board as the software SHOULD be good. Be sure the cable wires are twisted to avoid interference. Then outside of that, the board would be my only guess, ho
  23. I've been doing as Nick suggests for a long time. It just takes a bit of a trained eye to notice what the proper line width should be as it's printing, but it is easy enough to pick up. Basically, unless my first layer is really having trouble sticking, I am just checking to make sure the fill looks like this - - - - - , not -^-^-^-^- (bed being too close and pushing excess PLA into the line next to it then upward) or -v-v-v- (bed being too far away, causing a line that is too tall and not pushing the PLA out to the width expected for the volume). Of course, that requires that your steps per
  24. I would agree. Most of the inconsistencies I find in the first layer are a result of prying the previous part off the build platform, causing the bed to come out of level.
  25. Not at all... Why would you think that???? (Throws print across room...)
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