Firmware changes for Max?

[calabus]

Could someone kindly run me through any needed changes to the latest firmware for the Max? I am mainly concerned with all the hotend settings such as the resistors and temp sensor. I am using the RAMBo board BTW. Thanks in advance for the help.

[JohnStack]

There is a video here

http://www.youtube.com/watch?v=A4yMV18oMbw that has the changes...

[Jimustanguitar]

After you've been going for a while, you'll inevitably make some changes of your own. I've been logging them in a spreadsheet to use as a checklist whenever I update the firmware.

[calabus]

Thanks guys...my config looks good now, except for page 154 and the final config setting. I have run script 4 and the hot end is WAY off the surface. Not even close. Did I miss something? All the other calibration tests are fine.... x,y,z are perfect.

*edit
Looks like my Z height it thrown off somehow. I will run through the entire config again.

[Jimustanguitar]

Looks like my Z height it thrown off somehow. I will run through the entire config again.

No need to repeat everything... Double-check the X,Y, and Z heights with the EEPROM tool in Repetier (the host program) and then make sure to change your setting under the "printer shape" tab of the printer setup menu in repetier. If you change the values in all 4 places, it should work just fine.

[calabus]

Looks like my Z height it thrown off somehow. I will run through the entire config again.

No need to repeat everything... Double-check the X,Y, and Z heights with the EEPROM tool in Repetier (the host program) and then make sure to change your setting under the "printer shape" tab of the printer setup menu in repetier. If you change the values in all 4 places, it should work just fine.

I though I had done that a few times but i'm still coming up way short running script 4 (yes i am uploading the firmware with each change to PRINTER_RADIUS). I'm assuming my #define PRINTER_RADIUS is too far off. Is there a good starting number to try? I think mine is around 174.3 or am i approaching the problem incorrectly? All my other calibration points are just fine (scripts 1-3).

[Jimustanguitar]

So is your problem that the overall Z-0 position isn't at the right height, or that the height in the center is different than around the perimeter?

[calabus]

It is the Z height at the center is way off (script 4). The other 3 axis are fine. When I run script 4 the head is a good 1/2 inch off the bed. If I go back to the start of calibration and run G0 Z10 F3500 the head should go to about 10mm off the bed and I jog it down to the right height. Use the Z number to adjust the EPROM and test again. The problem right now is I can't jog down far enough before Z=0 and I can't bring it down anymore. Does that make sense?

[geneb]

I suspect your printer radius value is way out of whack. Mine is around 198 (or so).

Try this:

G0 Z5 X0 Y90 F3500
followed by
G0 Z5 X77.94 Y-45 F3500

If you've got the printer radius value pretty close to correct, the tip of the hot end should remain 5mm over the bed as it moves from one tower to the other. I suspect, based on what you've written, that the nozzle will describe a pretty significant arc as it moves from X0 Y90 to X77.94 Y-45.

g.

[calabus]

I got it worked out. A lot of tweaking the RADIUS firmware setting and the max height PIDs. Once I unscrambled my brain a bit it kinda made sense what values would get me close to perfect and worked the PID and RADIUS numbers from there. Thanks for the replies and help! More questions to come i'm sure.

[Jimustanguitar]

More questions to come i'm sure.

Bring it

[theverant]

I got it worked out. A lot of tweaking the RADIUS firmware setting and the max height PIDs. Once I unscrambled my brain a bit it kinda made sense what values would get me close to perfect and worked the PID and RADIUS numbers from there. Thanks for the replies and help! More questions to come i'm sure.

If you could explain how you made your changes, that would be great. I tried changing the PRINTER_RADIUS in the firmware (Arduino upload) and changing the value produces no change in the printer. Unless I toggle the EEPROM on and off, and that introduces other problems and inconsistencies.

Cheers,
Nathan