The infill material doesn’t touch the perimeters for some reason. See some examples here: https://plus.google.com/photos/102071847938163365000/albums/6084902384093859425?authkey=CNGeuMv8kd2kuAE It’s not that the motors are losing steps, because on the next layer the perimeter is laid right on the previous layers perimeter, but the infill is again not touching the perimeter. So I guess it’s either slicing, or firmware problem… I can provide you the configuration in Repetier, slicer, and settings in the firmware if necessary.
I can’t seem to get the plastic flowing long enough to finish a print. The extruder motor keeps working but the plastic stops extruding after a while. Sometimes it’s after 2-3 layers, other times after 20-30 layers, other times (less often) it finishes the print without problems. But it’s not a clogged nozzle, because if I start a new print after just a few minutes, or if I push the filament manually, the extruder extrudes again without problem or difficulty.
If you have any ideas or suggestions on how to fix these problems, it would be much appreciated. If you need any additional information, please let me know.
You have some serious backlash in your motion - check that all pulleys and belts are tight. Maybe try machined pulleys instead of printed ones. Also, like Mark already said, it seems you have a periodic extrusion error. I’d guess the hobbed bolt/gear is not up for the job.
Might be a bad bearing or an overheating stepper driver.
Check your voltage, are you getting enough?
Check your extruder gear isn’t getting tight at some point - in fact, do that with all your gears. You may have to file down a high spot -I did, with my first extruder.
I like your printer. Not much else i could add here but, if the stepper always looses steps when the carriage is as a specific spot i would look for binding in the. Again for what was already said, next i would check VREF, also check for over heating drivers. If the driver is over heating it goes into thermal safety and turns off for an instant to cool it slightly.
I agree with what has already been said about the problems shown in your “printing errors” gallery, but I’d also check the PID tuning in your hot end. The hobbed bolt/hobbed pulley being full of crud or in some way damaged is a more likely cause, but checking your PID tuning isn’t a bad idea (especially if you haven’t done so, or haven’t done so since getting everything mounted in its final position).
Thank you all for your feedback. I’ll go through all your suggestions and see if anything helps. You also gave me a few ideas for some additional test that might also narrow down the list of possible causes for these problems.
I’ts been a while since posted the problems with my printer.
Just a quick update:
I changed the pinions and the toothed belt, changed the bronze bushing from the shaft end with ball bearings, added a reduction and reduced the microstepping for the motors and with all these changes I managed to reduce backlash and the motors don’t loose steps any more. So it’s a significant improvement.
I still have some problems with the extruder, but I’m working on that too. (Unfortunately just a little at a time, due to lack of time).