What is wrong with my setup??

Controllers Smoothie
1

I have been having problems with printing lately an i am really confused.

I have always had to have a negative g-code setup (about -0.4mm) in simplify3d to get the head close enough to the bed to get it to stick.
Now i thought i should check my z height and gamma value setting, but it is all really weird.

If i use the method to set gamma max as per the wiki: Finding gamma_max manually

First home the machine
G28
Then set the current Z position to 0
G92 Z0
Then move the head to the bed, using G0 Z(position) or Pronterface or the web interface.
Once the head is exactly at the bed, issue this command
M114

As soon i enter G0 Z0 (as i think that should be at the bed) it want to go UP not down (crashing into my endstops at top).

If i use the other method (manual method)
The the machine thinks z0 is about 2/3 down from top (gamma_max is set to 618.2) as it is my height from top to bed.
But M114 says it is at z0.
Where does it get 2/3 down from??
And if i then jog down to the bed and issue the M306 Z0 command which will use the current Z position as a homing offset.
Then save to the SD card with M500.

It still wants to stop at 400 next time i use the G0 Z0 command. It does not save the setting it seems.

If i G28 (at the top at endstops) and M114 it reports z 400.6791

Imported from wikidot

2

Have you tried to temporarily rename the config-override file and restart?

I’ve had to do this a few times with my setup and it seems to clear up crazy behavior.

The first method you mentioned just reports a value to you so you can edit your config file.

Try homing then jogging down to your desired Z0 position and issue the M306 Z0, Then save with M500.

If this doesn’t help, I would lean towards your steps/mm being somehow incorrect. The printer believes it has traveled that distance when it really hasn’t.

3

Try saving your config, formatting the sd card, loading the latest firmware and config from the website, paste them onto the sd card, then port your old config values to the new file ( do not just copy/paste the old config file ) and try again

4

Thanks, i’ll try that. Why can’t the config be the same for all firmwares? Or are there new things added to the config?