Rambo Servo Setup for Auto Bed Leveling for Noobs

[printbus]

#define TEMP_SENSOR_0 1
#define TEMP_SENSOR_1 0
#define TEMP_SENSOR_2 0
#define TEMP_SENSOR_BED 1
This is what it's currently at

Well, then you at least shouldn't be battling the problem we used to have with MakerFarm's manipulation of Type 6 thermistor table data leading to problems when that table was replaced in a firmware upgrade.

I'll have to try and find some older posts. We've been through thisrecently. I just don't remember the cause being something that was different in the firmware upgrade.

FOLLOWUP COMMENT: Came up short in looking for prior posts to reference. One thread did remind us how a slight change in room temperature or any drafts can mean a significant difference in the bed's ability to reach a high temperature.

Easy stuff to check: make sure all screw terminals in the heat bed wiring path are tight; the stranded wires have a tendency to shift over time and loosen up. Loose connections lead to high resistance, causing reduction of power applied to the heat bed and melted screw terminals. If you can see between the heat bed and your insulation material, try to make sure the heat bed thermistor is still snug to the heat bed; if it separates at all it could start to read low/slow. Ideally, the insulation material should not press up against the insulation - depending on the insulation material, that could draw heat out of the thermistor and cause it to read low.

Another possibility is that through a difference in bed leveling or a difference in where the clips are placed around the glass, you've shifted where the heat bed does & doesn't actually touch the glass. If there's even a slight bit of a gap between the thermistor area of the bed and the glass, that localized area (of the actual heat bed, not the glass) will heat up faster than if the heat bed in that area is pressing up against the glass.