Hello all. I’ve been having problems printing things lately and I’m stumped. Almost every print I do, the nozzle ends up hitting the print and or digging into it during travel and printing. It is very random as well. Sometimes it does it at the beginning of the print but most of the time, it is near the end and it’s very frustrating. The prints start so good and are even and clear lines until this. I’ve looked this up on other forums and can’t get a clear answer. I’ve reduced the printing temp, slowed the print down, and even reduced the extrusion a little, but it still happens. Here a couple examples of the baby Groot heads I’ve been trying to print. Any help you all could provide would be greatly appreciated. Thanks.
gikam
2
I can’t see much from the pictures.
Perhaps you have Z problems.
Check the vertical (Z) rods are firmly fixed to the Z motors.
I would make sure the Build plate is level, also try checking your Z axis is level (both ends should be the same height up the rods)
travisW
4
Two possibilities that I can think of:
Bed not level. This one is simple, just level and re-calibrate your bed.
Overextrusion. This one is complex. Overextrusion could happen for any number of reasons. You could be overextruding only on the infill, the infill overlap, or maybe you are only overextruding like 3 percent, which causes the print to print normally most of the time but in areas where there are lots of layers it builds up high enough for the nozzle to hit.
I recommend taking a long, hard look at all of your settings (which can be A LOT of settings if you use programs like simplify3d) and asking yourself if that setting could cause overextrusion in some areas of the print sometimes. Tweak those.
One thing you could try to find out if it is overextrusion is by setting your extrusion factor to a number like 75%, then printing something. The print will still turn out mostly normal looking, but a 25% reduction will likely be enough to make up for any other settings you might need to change to fix the problem. If your nozzle doesn’t hit the print during this print, then overextrusion might be a factor.
1 Like
check that your bed is level (that means that your bed and x carriage are level to each other)and also try printing with a brim
Thanks for the input on this. I’ve made sure the bed is level. I feel I do pretty go doing that. The Z axis rods are tight and I can’t see any problems there. I’ve reduced the extrusion and reduced the fan speed to 50% and it seems to do it on support material. This problem started when I changed filament. I was using the purple Inland at first and got it working very well. I changed to the grey Polymaker and things just went to crap. I’ve wasted a half a spool of grey and very little to show for it other than failed prints. I’m going to try the black Hatchbox soon and see if I still have probs. Seems that this grey seems to expand just a bit when it cools, it’s the best explanation I can come with. Thanks.
Thanks for help all. I just gave up on this filament and went back to what was working for me. So far so good.
MVlad
8
There is another posible cause for this.
The contact surface between the print and the bed appears to be to small in comparison to the rest of the part that is large (from your pictures). It is posible that you have adhision issues with the adhesion and after x print time the adhesion losses, the part moves more and more during printing and at one point moves so much that the print head just hits the model.
