This guide will cover leveling the H-Series additive bed and will discuss what changes are needed to level the H-Series Dovetail bed.

Additive Bed

First ensure that your printer is in the Home position by pressing Home All and the correct z height is attained by clicking Home Z.  This is to help ensure that the printer does not crash into the bed when homing.

Once the machine knows its exact location, thread in the stainless steel M4 thumb screws so that they are snug against the four pins of the bed.

It is helpful to draw a line with a black sharpie on each of the thumb screws to mark their location.  Once the thumb screws have been installed the printer can run Auto Bed Compensation by clicking the button on the web controller:

When the machine completes the bed level routine, it will generate a height map which can be viewed by clicking on the pulldown menu next to Auto Bed Compensation and selecting Show Mesh Grid Height Map.  

In this example, the bed is approximately 0.25 mm lower on the right side than the left, hover your cursor over the probe points to see exact data. The pitch of the thumbscrew is 0.7mm, so the thumbscrew needs to be turned clockwise 0.35 rotations or approximated to 1/3. Tighten the clamping screw to secure the bed pin (Torqued to 10 in*lbs for M3 screws and 20 in*lbs for M4 screws).

Re-run the Auto Bed Compensation to double check the level of the bed after adjustments.

Repeat this process until the desired flatness of the bed has been reached.  Remove the thumb screws when finished.

Warning: There is a small limit to the travel of the bed along the pins that are defined by the bed heater connection and that the wires are not seating against the bard.  Double check that the bed is still properly reading the temperature.

Dovetail Bed

After sending the Home All command and before sending Home Z, ensure that the Y position is at -40.

The auto bed compensation will probe points along Y=-40 and Y=40 and if Z is homed at (0,0) the probe will crash into the Dovetail bed.

Before running the Auto Bed Compensation, ensure that bed.g in the system files has the correct configuration.  

The following line should NOT be commented out (There should not be a ';" in front of the M557 command). Save if you made any changes.

;Use with Dovetail Bed
M557 X-180:180 Y-45:45 S90

Click Auto Bed Compensation and follow the same procedure as the additive bed.  Remove the thumb screws when finished.

Adjusting the Bed Level Operation

The area where the machine will probe for the bed level operation can be redefined depending on the needs of the current job or work space.  To change the bed level operation, comment out any instances of the M557 command in the bed.g file (see previous section) by inserting a ";" before it and add a new line:

M557 Xaaa:bbb Yccc:ddd Seee

• Xaaa:bbb: Defines the range the the machine will probe in X
• Yccc:ddd: Defines the range that the machine will probe in Y
• Seee: Defines the spacing of each probe location

For example, to probe a 10x10 mm area at the center of the bed:

M557 X-10:10 Y-10:10 S10

This will probe at 9 different points within the 10x10mm area. The number of probe points can be increased by reducing the spacing (i.e. - change S10 to S5 to probe every 5 mm instead of every 10 mm)