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  1. I think a mechanical end stop switch sensor gives the most interesting options if it's accurate enough, more so than one that only detects metal. In theory you could resume some types of partial print by first calibrating the bed through the corners, then moving the Z axis to the bottom limit, center the head and move the Z upwards until the plastic part hits the calibration switch, probably repeat the calibration a couple times to get an average and then start skipping gcode until you get to the layer that corresponds to the measured Z height and start printing. It won't be perfect since the
  2. With a conductive aluminum bed, wouldn't it be possible to hack the top Z end stop switch and solder one lead to the print head nozzle and another to the bed so that it triggers if the two touch? I haven't checked to see if the heating element and temperature probe are galvanically isolated from the nozzle metal but i think they are... It would be a neat aid for leveling too! There would never be any question about where the absolute zero Z is
  3. I have the exact same issue with my ultimaker. I've gotten somewhat more reliable extruder operation from adjusting the bowden connection in the nozzle but it still likes to strip the filament in the middle of a really long important print :( I still haven't decided if excessive force on the thumbscrew is better than too little. Whenever i change filaments it takes three to four prints before i manage to dial it in to something that sort of works.... As far as i can tell this part could really need a redesign with two active rollers instead of the delrin friction drive! My goal now is to u
  4. OK, cool! I just realized i really need a dedicated printing station though. I just screwed up a three hour print because windows had turned off the monitor and replicatorG must have paused for a split second when i moved the mouse to turn the screen back on. Doh! Trying a laptop with linux, pronterface and every power saving option turned off now. It just finished yet another screwdriver, I'm going to have drawers full of these things by the time I finally get a reliable enough setup to print big parts
  5. Is there a trick to get the belts perfectly positioned? Now that you mention belts i think i have to readjust one of mine, even with lots of grease on the axis i can hear one of the brass bearings squeak a little when it moves across at a certain (slow) speed. I haven't had trouble with missed steps unless the nozzle rubs or crashes into the print but i figure any nasty movement noise means you're slowly wearing away at the metal and should be fixed as soon as possible... When i first did the adjustment I just loosened the pulley on each side and moved the head carriage back and forth several
  6. I'd still say my extruder is "temperamental" at best, if i try to speed up above 100% things go haywire right away, with nasty stripped PLA getting fed into the bowden tube, and eventually it digs into the PLA enough that extrusion stops. If i leave it to do its thing at 100% speed though it manages to finish small parts fairly reliably. I'm starting to amass quite the collection of neat little screwdrivers How do you guys run your extruders? Tight or loose? I suppose i can try adjusting the thumbscrew REALLY tight tomorrow, i saw someone mention on the google group that they managed to s
  7. This is how it looks after reassembly. It might be a bit much but it's extruding fine right now. I probably have to fiddle a bit with the feed rate now that it flows better.
  8. Yup i got it out by just installing the heater again and warming it up to about 150C so it was soft and pliable. It came out as a nice plug and the PEEK looks pretty clean inside now. I just saw another forum user talking about using compressed air and a blowtorch, and was preparing to have to do something similar. Glad it's not really that difficult to clean PLA out of there
  9. OK, i went through the calibration steps here http://wiki.ultimaker.com/NetFabb_Setup ... d_versions but didn't really get any better results. I removed the hobbed bolt and cleaned it though, and tried feeding material through by hand while running the nozzle at 200C and it felt like it required suspiciously much force. Have a look at how the PEEK looks inside :( Album is here: http://imgur.com/a/0gJ8N#0 Looks like even with the plumber tape and trying to make sure i had the bowden tube sticking out far enough from the carriage i still managed to screw it up. Now i just have to fi
  10. Thanks, I forgot about the calibration step in netfabb but i'll try that today. Fingers crossed!
  11. Hi! I've only had my ultimaker for a couple days, but i'm really struggling getting the right material feed rate, my extruder keeps trying to feed too much, building up pressure in the bowden tube and eventually stripping the PLA filament, ruining my prints when the flow stops. I'm unable to find the perfect sweet spot where i get good adhesion on the first layer and also enough flow through the nozzle to prevent a jam. I had hoped i could work around the problem by setting a really low feedrate for the Marlin firmware at the start of the print with for instance M92 E7 and then upping it to M
  12. Instead of a stepper, why not some sort of valve on the nozzle that can be quickly closed and opened? I'm still waiting for my ultimaker kit to be shipped so i'm not really familiar with the mechanism, but it makes more sense to me to leave the main feeding mechanism where it is and add a small solenoid or servo to the print head that could either block the nozzle with a tiny metal pin or maybe even operate some sort of scissor or knife mechanism to cut the plastic string at the start of a fast jump.
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