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Hotend hitting print

Posted by timo 
Hotend hitting print
October 17, 2013 03:54AM

Having problems with my MakerFarm Prusa i3 when I print the hotend hits the print which makes the x axis move out of alignment. I have checked and my steps per mm is set correctly to 4000. And if I print a 20mm cube the end height when I measure it was 20.30mm so that is good. I have tried printing at different speeds and all but in the end it hits and stuffs the print.

Currently I am using the latest Marlin firmware, pronterface and KISSlicer. I have also tried Silc3r. I am printing with 1.75 ABS filament, tried 0.25, 0.252 & 0.3 layers.

Any suggests what else to look at or try?

Re: Hotend hitting print
October 17, 2013 07:00AM
take it it only happens when crossing the print??, if that the case then find the setting in slicer where you lift the Z axis by .5 while traveling across the print..
Re: Hotend hitting print
October 17, 2013 10:15AM
Some posible causes:
  • Bed height not calibrated well: The distance from the bed has to be the same, wherever the hot end is. It also has to be close enough for the plastic to stick well.
  • Warping a bit, any sign of detaching off the bed? One way to avoid warping is to make sure it is stuck to the bed. If you're printing on glass, window/glass cleaner or acetone can help if it is dirty.
  • Overextrusion plus time enough to cool also sounds plausible.
Re: Hotend hitting print
October 17, 2013 04:21PM
Thanks both for the ideas.

@Jinx While yes it is only when it crosses the print, not sure that setting would help unless I also put a anti-backlash mod on the z axis first. Once I can print reliably I was going to do this.

@ Jasper
  • I normally check and re-level the bed most prints and I think I have it nice and level
  • I have no troubles with the print sticking to the bed. Even when it gets hit it doesn't lift/move.
  • Possible, I will play with the extrusion a bit and see if that helps.
Re: Hotend hitting print
October 18, 2013 09:38AM
Note, the sticking to the bed only prevents warping when it mechanically able to do it.(I have always used PLA so far, so not that much experience with warping.
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