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  1. Well I'm not too experienced myself, but I'd say "peeing" before printing is normal with PLA - in fact, if it isn't oozing, I'd say your temperature is too low, and thats why you've got such a sparse print on #1. If you can spare a few dollars, get a multimeter with a thermocouple probe (about $30 here in Australia), and hold it directly in the flow of the PLA coming out of the nozzle while extruding manually and see what is - I set my program temp to 210 to get 190 at the nozzle. I don't know about the other problems - maybe a communications problem - what baud rate are you using? Also maybe try Slic3r - its not based on Skeinforge so gives different results - I've noticed Slic3r produces smaller gcode - e.g. fewer decimal places and no Z moves when there are none etc.
  2. Well I'm more confused than ever, but I got to print Yoda at around F15000 - I just don't know what happened. I thought I'd try slowing it down a bit, so I opened the gcode file in an editor an replaced F15000 with F10000 (not realising that only the first few layers used that exact feedrate). I saved, opened Printrun, and printed perfectly. But halfway through the print I thought to myself "it seems really fast". So I looked at the gcode file and realised that from about layer 5 it was printing at F16283 or something, and the feedrates were constantly changing - obviously a setting in Slic3r I don't understand. Nevertheless, it was printing smoothly at the feedrates that were causing me problems before. If the staggering occurs again, I will try assigning Printrun a higher priority in Windows, and will see if that's the source of the problem. Thanks for the help.
  3. I've measured the temperature of the PLA coming out of the nozzle using a multimeter with a thermocouple probe, and found it to be about 20 degrees lower than what Printrun reports - so I just print 20 degrees higher than what I want - I usually use 210, so that it is actually coming out at about 190, which seems a good temperature for PLA - a little bit stringy, but the hobbed bolt doesn't slip and chew anymore.
  4. I started this morning printing Yoda-lite. It started fine - running at F15000 (250mm/sec in Slic3r), going around like a madman, and the first 10mm printed just fine. (Edit - 0.08mm layer height, so the 250mm/sec is reasonable) I have a recently rolled Marlin from Build-me-Marlin (built today). I'm using Printrun, and 250000 baud. Then all of a sudden, in the middle of the print, it started jerking while doing the profiles, but still going nice and fast on the infill. I thought maybe it was because I closed Firefox on the PC. So I stopped the print, restarted the computer, unplugged the USB cable to the Ultimaker, unplugged the power to the Ultimaker. I let it cool for about 1/2 hour, then powered the computer back on, powered the Ultimaker back on, plugged the USB cable back in, started Printrun again, loaded up the exact same gcode file and started printing again from scratch (after removing the partial print from the table). But it is still jerking on the profiles, starting on layer 2 (layer one prints at 30% of top speed and prints just fine). Remember, I was able to print 10mm before - about 125 layers. I thought it may have been the steppers or stepper drivers overheating, thus I let it cool for 1/2 hour. I thought something on Windows 7 might have been interfering with the USB->Serial port driver etc, thus the complete restart. I also reflashed the firmware, just in case. Nothing has helped. It still seems to follow the correct path - I don't think steps are being missed - its just coming out blobby because of all the pauses, but other than that, all seems well. Any ideas what may be going wrong? I'm at a loss of even how to diagnose it - are there any diagnostic M-codes that will tell me things like if the stepper drivers have been overheating or anything like that? Is it possible that although the USB->Serial interface is connecting at 250000 baud, it has been secretly slowed down by Windows7?
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