Prusa i3 pro C - dual extruder extruder offset fine tuning

[jaitas]

Hello

I have started to try to print with two colors with my Prusa i3 pro C

There a offset of about 0.5mm (Both X and Y axis) when printing two colours. I have tried to set extruder offsets from repetetier but that doesn't seem to have effect.

Is this kind of fine tuning done with the firmware, and if yes are there tutorials or instructions how to do it?

thank you in advance for your answers

-J

[Mark]

Can you post a pic here?

[jaitas]

Hello

Here's a picture attached showing the slight misalignment. It's most visible in the wipe tower highlighted in red.

X axis has about 0.7mm and Y axis about 0.5mm I don't remember the exact measurements right now.

And it seems that setting extruder offsets either in Cura or Repetetier won't have any effect so I was wondering if the fine tuning is supposed to be done in printer firmware file?

thank you in advance for your answers!

[Mark]

How about adjust the offset here.

[ric chin]

I have done this.... but mine still prints two completely different parts.

There is no change...

is there a more practical way to go about this.....???

It took me 2 months to get the correct firmware for the heads to actually print....and I have been struggling with it ever since...
broken and melted parts..ect. The entire head bracket fell off caust the screws pulled right out of the 3d printed mounting bracket nuts and all...made a new metal one...that fixed that.

now this whole extruder alignment thing...I expect 6 months before thats solved...

I hear london drugs has one fully assembled unit and starts printing right out of the box....for 800 bucks...after the time i've put into this one I am about to fire it into the garbage and go buy that one...

[Mark]

How about the two nozzles? are they in a same plane?

[jaitas]

Hello

I managed to find a good solution by applying extruder offset settings via setting g-code strings to the printer.

You can sen g-code lines to printer with repetetier host.
1. send command "M218" -> it will return your current extruder offsets and using that information you can calculate your new offsets.
2. send command "M218 T<extruder_number> X<offset_on_X> Y<offset_on_Y>" (where T=0 is extruder 1 and T=1 is extruder 2. Offsets seperated by point for example T1 X32.00 Y0.50)
3. Verify that you have correct numbers by sending "M218" again.
5. Save settings to EEPROM by command M500
6. Remember to erase all extruder offsets froms slic3r / cura etc.

Here's more comprehensive post about g-code commands: http://www.marlinfirmware.org/index.php ... _in_Marlin

(also a disclaimer that use this at your own risk I won't take any guarantee how this works in every case but it worked in mine)

So now my extruder heads are aligned and next to start battling the big oozing issue I have with these nozzles!

p.s. and yes Mark I have leveled my extruder heads

[ric chin]

yup...30mm apart...on the X axis....no variance on the Y axis...

[Mark]

Why the offset in the repetier host don't work???

[ric chin]

That is the question we are asking you...why don't the offsets work?