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Posts posted by fabiodl

  1. With some spools, I had a strong squeaking sound with the standard UM2 spool holder.

    I plan to print the low friction spool holder, but for now I found a quick fix which seems to work very well, so I'd like to share it.

    I covered a piece of paper with PTFE tape (3M PTFE-Film-Tape-5490) and put it between the spool and the standard spool holder.

    I then did the same for the filament guide shown in the first pic of this post.

    the squeaking sound is gone, and the friction is clearly strongly decreased.


  2. Thank you very much, today I unclogged my UM2 nozzle using the simpler version method.

    However, I have some questions

    1) how do you push the head? Is there any menu to move the head x and y position in new firmwares?

    what I did was using the "change material" to have the machine place the head at the front. Normally, at power on the motors are powered and stiff.

    2)Similarly, when in the "heat nozzle" menu, the feeder is stiff (motor on). To pull the filament, once I was at 90 degrees, I switched the machine off, and manually pulled the filament. Is there a better way?


    I got dust on my filament and then in my UM2 nozzle and had to clear 4 blockages in 4 days and now have a recommended method - would take 1 minute if I didn't have to wait for the nozzle to heat up and cool down (minimum 2 heats, one cool).

    The Atomic Nozzle Cleaning Method Simpler Version (July 2014)

    (named after Mostly Atomic Bob who may or may not have invented it - not sure)

    I do this method on EVERY FILAMENT CHANGE now. It keeps the nozzle clean I hope.

    If you have no filament in the head, heat nozzle to 180C and while waiting insert the filament manually through the feeder, cutting the tip of the filament to a point first. You have to push very hard to get the feeder spring to move back but then it's easy.

    1) Set nozzle temp to 90C. Wait for the nozzle temp to cool or heat to this value. If heating wait 10 seconds at this temp. Push the head to the front of the machine to reduce friction in the tightly bent bowden. Grip the filament firmly below the feeder and pull down. You should get a nozzle tip shaped end on the filament.

    2) Pull the tip half way through the bowden and then pause 10 seconds. If this is your first time pause 20 seconds. This is to let the PLA cool below glass temp (to about 40C) so it doesn't come apart in the feeder.

    3) Pull the filament all the way out. When it is getting very close do it in one fast swift motion so that the stepper is spinning with momentum and pushes the tip out.

    If it breaks inside the feeder (happens about once every 50 times) instead of taking it apart you can get some small tools and push the roller away from the feeder sleeve with one tool while someone else digs around in there to get the PLA out. If that doesn't work take it apart.

    4) Examine the tip for dirt, etc. Cut it off with two snips to make a chisel point. Re-insert through feeder into print head, set temp to 180C. You have to push pretty hard to get past the feeder spring. Wait for temp to hit 180C, push the filament into the nozzle and if nothing leaks out the tip go back to step 1. Repeat this procedure until the tip comes out clean and/or it starts working again. Inserting a needle through the tip may help but doesn't seem to be necessary.


  3. I am sorry, it was actually not a firmware problem. It was just a material grinding problem that occurred in the middle of the print. When I came back and saw just one out of four objects, I wrongly assumed that the printer stopped after the first one.

    Today I started a new print and noticed it was just a grinding problem.

    If any of the forum admin feel it is better to delete this thread, please go on.


  4. I do not know if this is a firmware or software problem, but I guess the first. Using cura 14.07, with the options shown in the screenshots here http://robotics.dei.unipd.it/~fabiodl/share/fourObjectsCura.zip I generated the gcode in the zip file. The printer stopped after building the brim of the second object, saying print finished.

    Firmaware is 14.07 as well.

    Do you have any idea of the reasons of this bug?


  5. I noticed that sometimes cura (version 14.07) generates gcode for having the objects printed one after the other (print one, all over its z, and then move to the next one), while other times the objects are made in parallal (same Z layer for both of them).

    What is the criteria? Is there an option for changing the default behavior?

    I am sorry if this is a dumb question, but I could not find an answer by keywords like "one object after the other" etc.


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