Quote Originally Posted by DBFIU View Post
I just ran this line through pronterface.

G29 V4 n4 F25 B175 L25 R175

...
Although I could push it further out, I think it would be getting too close for comfort.
Yes! You need to have both sides when looking for the boundaries. And for that matter, you need both axis too. The reason is if anything is wrong, it won't probe any points.

Usually, most people back off a little bit more and make the probed area a few mm smaller just to make sure the probe is well within the bed area. Missing the bed is horrible because the nozzle is going to get driven straight into the bed.

Quote Originally Posted by DBFIU
Here is my pronterface returns.

SENDING:G28
>>>G29 V4 n4 F25 B175 L25 R175
SENDING:G29 V4 n4 F25 B175 L25 R175
Roxy's Enhanced G29 Auto_Bed_Leveling Code V1.81:
Full support at http://3dprintboard.com
Bed x: 175.00 y: 125.00 z: 2.31
Bed x: 25.00 y: 175.00 z: 3.99
Bed x: 75.00 y: 175.00 z: 3.63
...
Bed x: 125.00 y: 175.00 z: 3.24
Bed x: 175.00 y: 175.00 z: 2.70
Eqn coefficients: a: -0.01 b: 0.01 d: 2.98
Mean of sampled points: 2.817552
This all looks good....

Quote Originally Posted by DBFIU
Bed Height Topography:
+1.17384 +0.81609 +0.42592 --0.12006
+0.78617 +0.43964 +0.01706 --0.50399
+0.46831 +0.10806 --0.32199 --0.88792
+0.25266 --0.32947 --0.83931 --1.48501
The Auto Bed Leveling code should be able to correct for this. But you have a 2.5mm difference in height from the back left corner to the right front corner. That is a lot! You should push the back left corner down a little bit and pull the right front corner up some. It should print OK the way it is. But you will get better adhesion and a better first layer if you get this more level.

Quote Originally Posted by DBFIU
Bed Level Correction Matrix:
0.999956 0.000000 -0.009393
0.000073 0.999970 0.007731
0.009393 -0.007731 0.999926
echo:endstops hit: Z:2.70

The matrix seems to tell me that the bed is very flat, just very tilted, but that is OK with me.
The Bed Level Correction Matrix only tells you about the tilt. But looking at the Topography matrix it does appear the bed is very flat. Looking across the rows and down the columns I don's see any big jumps. If you get the bed more level, you will get a good first layer every time.