Hi again!i have posted a problem in printing with my new printbot metal.nice printer but i still try to print. So in this video you can see the reaction of the nozzle when i extrude. It doesnt flow in a straight line. What do you think?
That’s pretty normal. If you start the filament guide with your tweezers you’ll probably be able to get it to come out in a strand
That’s what mine does if I just extrude into thin air; once it’s in contact with the bed it shouldn’t be a problem.
Are you actually having problems when printing?
Well when it touches the bed i have to remove the filament aroung the nozzle and let it http://flow.it is a bit of strange. In other kits that i have tried they can extrude in a line.so yours does the same but it prints ok?
Extruding in a line has no indication of print-ability. It’s like lifting a car in the air then being surprised it doesn’t move forward.
You’re too high if it clumps up. Reduce your offset
I just trying to gind what i fo wrong in order to print well.maybe the calibration of auto leveling sensor is more difficult than i thought.
You may have a partial clog of your nozzle. That’s usually what it means when free-air extruding comes out at a serious angle. There are various ways to try to remove the blockage, but what’s called a “cold pull” usually works best. If you have an all metal hot end (and have nylon filament) you can do a cold pull with nylon, which tends to work well, but if not you can do it with PLA. I think Nophead has a post describing doing one with PLA.
Clean the nozzle, check for damage to the hole. Look for burrs or dents. If the nozzle is clean, it should extrude straight down. There are various cleaning procedures online. Whatever you do, don’t stick something in the hole of the nozzle, you will risk damaging it.
If it’s a new printer it’s unlikely to be damaged. It’s probably just a normal extrusion problem and if he pulled the clump off and let it fall it would extrude normally
You can use brass bristle brushes with to clean the hot end and the orifice hole since similar metals tend not to gall each other.
So i print now a testing cube and it goes well. After i remove the first stucked filament in the nozzle but this is ok. Oh something more this success is with repetier. I tried to use cure( which i regularly use) but no luck.so i will learn repetier too!
In general it should extrude in a roughly straight line, unless your extruder is dirty, or your temperature is low or extrusion speed is too high such that it starts hardening too soon. If you are getting small popping sounds, you might have moisture in your filament.
See
http://reprap.org/wiki/Aluminatus_TrinityOne_Printing_Manual#Removing_filament
http://reprap.org/wiki/Print_Troubleshooting_Pictorial_Guide
http://reprap.org/wiki/PLA#Moisture_Issues
I find that whether free-air extrusion goes into a straight line is partly function of nozzle, partly of filament. PLA seems much more willing to bunch up, especially mediocre PLA extruded hot. One last thing: was the fan on?
I noticed mine doing that last night when it extrudes in the air, but it doesn’t effect printing at all.
No the fan was closed. 200c temp for this pla. The problem is that when it touch the bed it starts to extrude to the left so the nozzle gets messy with filament.i have print an ok cube but when i try to print something else i cant pass the first layer.
This is because filiment is unconstrained in the open air.
If you are not able to get the first layer to stick you need to reduce your bottom layer height.
Max layer height is .8*nozzle diameter, if you are printing any thicker than that you will have these random things causing problems
Are you printing a skirt?
Yes im printing with skirt.the filament stucks to the bed but in some spots like corners it gets messy
Take a picture of the nozzle, close up. It sounds like some sort of blockage or crud.
Can we see what it looks like while actually printing? That would be a bigger help.
I’ve got a wooden PrintrBot Simple with the same head. In free air it will just extrude squiggles and stick to the head. The point of the perimeter skirt when you start is to get everything flowing smoothly. Expect the perimeter to be messy, as long as it’s sorted itself out by the end before it starts the main print.