Any Ideas how to fix this. The layer height is 0.125mm and it is running at 6mm/s. The bed is 70C and hotend 215C. The printer is a BCN3D Sigma. The printer has a built in bed calibration and z-height calibration that was done right before this print. It appears the hot end is closer to the bed in the middle of the bed and farther away at the ends like the build plate is warped. I have a flat gannet stone Ive set it on to make sure the glass is flat. Ive also double checked the bed is in the grooves for the magnets. Ive printed parts at each corner of the bed and the left side is so far away from the extruder and it doesn’t stick. Then on right side the extruder is so close nothing is extruded.
Hi, i would cover the entire print area with blue painters tape to increase adhesion and verify height and level calibration. I have seen this when the hot end is a bit to far from the print bed due to incorrect leveling. The printer noisily simply isn’t applying even pressure throughout first layer print…
Thats the thing the print head is very close to the bed. I took the part off the bed and measured the thickness and the part where the filament isn’t sticking is around 0.4mm but the middle is like 0.16mm while the back is 0.24mm thick.
Check the flatness with the bed heated. It could be warping when hot.
Also, assuming that the bed moves, the rods that support the bed need to be parallel to each other and ideally the bed.
You should use a thick first layer and then have subsequent layers at the desired resolution. My first layer height is always .3mm and then I run most of my prints at .2mm layer height or lower
@Wylie_Hilliard That was a good idea to check it when its hot. I did that and its still flat when hot. Im not sure how I could check the rods that support the bed in the back for parallel but I will think about a way to check that.
@Griffin_Paquette I’m currently trying this and the side that is really thin in the picture is still very thin to the point of cutting off the flow of the plastic.
I’ve had this happen with my printer. Bed ended up bowed in the center. What firmware are you using? Some allow for more points to be probed to develop more meshed leveling. I would shoot BCN an email before anything else and see if they can replace the bed for you
If you are sure the bed is flat then something else is out of square. As Wylie mentioned make sure the rods are parallel and not twisted. You can do this with a level across them at both ends and make sure the bubble is in the same place all the way across. You might need a shorter block to put the level on. Or, put the level on the bed as it moves and see if it changes.
I would also check the travel of the extruder for the same thing.
Alternatively print a raft to get your prints out till you get the bed sorted.
What firmware are you using?
The Sigma uses multiple microswitches during its bed levelling (not just a single probe). My bet would be it’s something to do with those switches. Check to see if either of them is loose.
@Panayiotis_Savva @Griffin_Paquette I’m running 01-1.2.2RC which is a firmware provided by BCN3D based on the Marlin firmware I believe.
@Michael_Scholtz Ive been thinking about trying that but I would like the bottom to have a nice finish.
@Griffin_Paquette Ill send BCN3D an email with the picture to see what they think of the first layer thanks for the idea.
@Jeff_Parish From what I can using a bubble gauge the two shafts are parallel. Although a bubble gauge level isnt all that accurate.
@Neil_Darlow Neither of the switches are loose 
One is kicked sideways a little more than the other one though. Ive attempted to tighten both so see if I can straighten it with no luck.
Ive noticed something interesting about the leveling system that it is tilted quite a bit. Ive marked the picture with red arrows where I measured but the left side=0.3235" right side= 0.3870". So something is 0.0635" off.
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