Printrbot Talk Forum

Thanks for the input. I dont have any good square ruler handy. Let me try to borrow. I am kind of positive that there is a bend in my bed.

Btw, can any of you tell me how the rotation matrix is applied by the Z-probe algorithm.
Here are are my G29 outputs
SENT: G29
RECEIVED: Bed x: 10.00 y: 142.40 z: 0.57
RECEIVED: Bed x: 10.00 y: 10.00 z: 0.63
RECEIVED: Bed x: 142.40 y: 10.00 z: 0.81
RECEIVED: ok
RECEIVED: echo:endstops hit: Z:0.81

With Grid leveling on a different printer, I got this
RECEIVED: Bed x: 20.00 y: -20.00 z: 0.29
RECEIVED: Bed x: 190.00 y: -20.00 z: 0.61
RECEIVED: Bed x: 190.00 y: 60.00 z: 0.89
RECEIVED: Bed x: 20.00 y: 60.00 z: 0.63
RECEIVED: Eqn coefficients: a: 0.00 b: 0.00 d: 0.35
RECEIVED: planeNormal x: -0.00 y: -0.00 z: 1.00
RECEIVED: ok
RECEIVED: echo:endstops hit: Z:0.63
endstops hit: Z:0.63

What are Eqn co-efficients and plane normal values ?

I agree with Moose. Just get a very good metal ruler that is at least 12" long. Test for level using the edge and a flashlight. I am not sure how level the beds are. But I would expect to see no light.

[quote="waran14"]Thanks Jay. I want to know if my bed is actually bent by probing different points[/quote]

You can do that with gcode. Here's a sample that will probe four corners of a 150x150 print surface, just add or adjust x and y coordinates as you see fit.

[code]G28
G0 X10 Y140
G30
G0 X10 Y10
G30
G0 X70 Y70
G30
G0 X140 Y140
G30
G0 X140 Y10
G30[/code]

Use a straightedge and look for a gap underneath. Low tech, but effective.

Kirk

Thanks Jay. I want to know if my bed is actually bent by probing different points

This article from the Printrbottalk Wiki explains that you can use Arduino to compile, but not to flash: http://www.printrbottalk.com/wiki/index.php?title=Firmware_Update The tool for flashing under Windows is Flip - which is a program created by Atmel (the maker of the CPU chip).

Also, there are other compilers. I like PlatformIO: http://www.printrbottalk.com/forum/viewtopic.php?f=22&t=10160. But I still use Flip, because PlatformIO hasn't lived up to its promise of uploading the firmware under Windows.

By the way, the "auto leveling" firmware ONLY corrects for a FLAT bed whose plane is not exactly parallel to the X-Y motion of the printhead. It doesn't correct for warp or bending on the bed. There have been many discussions of using more than 3 points, but I think that Mooselake nailed it when he said that even if 9 points allows you a "least squares best fit," the uncertainties are so small with 3-point leveling that using more is just a waste of time.

Hello All,

I am using the Printrbot simple metal F5. I want to use the GRID leveling instead of the standard 3 point autoleveling.

I would like to update the firmware and flash it. Below is the change I want to make

#define ACCURATE_BED_LEVELING //Activate this <---

#ifdef ACCURATE_BED_LEVELING
// I wouldn't see a reason to go above 3 (=9 probing points on the bed)
#define ACCURATE_BED_LEVELING_POINTS 2
#endif

I went through the flashing procedure for windows and it involved using ATMEL. I am not sure if I should go this route.

Can i compile the firmware in Arduino and Flash it ?