Thanks for replying so quickly, gr5.
Nice to know that wretched sound (that kills my soul a lil everytime i hear it) is not bad for the printer.
I think it's safe to say i just get most slipping on the first layer. On some prints pretty bad. It gets underextruded and rips up layers it had laid down.
Right now I print my first layer at .2mm at 20mm/sec and at 230. The rest of the print at .09 at 40mm/sec. Print bed at 67.
Ever since I moved .3mm to .2mm on the first layer it has helped a little bit.
Those numbers sound good to you? If so, I imagine it's just really getting that bed leveling correct and then eventually building a better feeder and spool holder?
I shouldn't have to readjust the bed after every 10 hour print?
Thanks again. I know this stuff has been discussed hundreds of times...
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gr5 2,224
You want to print a thicker first layer if it is slipping - in other words your bed is a little too close to the nozzle if the first layer is causing the feeder to slip.
Slipping isn't bad for the stepper. There is absolutely no harm. Steppers have electromagnetic coils which create magnetic fields. There are no gears or anything that are skipping teeth - it's just like if you have two fixed magnets and one moving magnet that likes being near the 2 fixed magnets. When you push the moving magnet to the second fixed magnet it doesn't want to go but then suddenly slips/jumps. That's all it is inside the motor.
Skipping on the first layer is not a big deal if you are printing, say a UM robot where people don't look at the bottom much but if it is say a cell phone cover it is critical.
I haven't had *any* skips for several weeks. They shouldn't be hard to avoid. Especially first layer skips you just lower the bed a tiny tiny bit. Give that plastic more space to seep out.
Skips on upper layers are more of an indication that there is either something wrong with your printer or you are doing something wrong. What temperature/layer height and print speed are you going for? At 230C, PLA you should be able to safely print at 5mm^3/second. At lower temps, lower speeds. For example .1mm layer, .4mm nozzle, 100mm/sec is (can you multiply 1X4?) 4mm^3/sec. Should be doable without any skips at 230C. But not at 210C.
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