Reprap Prusa i3 V2 Extruder Upgrade E3D Titan

Hello Compadres,

I have a Reprap Prusa i3 V2 with original extruder (I think it's the MK2). I was wondering if anyone has any experience with the E3D Titan extruder Prusa kit upgrade. My question is, do I need to change anything in my firmware to get this to work? I read that there is a firmware upgrade but I'm not sure if it pertains to the model I have. I am using the RAMPS board with the Arduino Mega. The hardware install looks fairly straight forward but I am curious about the firmware changes.

I would like to hear from people who have upgraded to this or any recommendations for upgrades to this model printer I am using.

Regards,
DM

You'd have to recalibrate your firmware with a different steps/mm for the extruder and possibly change the direction pin for the extruder motor.

PDBeal,

Thanks for the info. I will google for the exact changes. I didn't even thing about the direct of the motor. Much appreciated.

PDBEAL is correct. I installed the Titan extruder on my Pursa. It took a bit of time to calibrate the steps of the stepper motor to get exactly what lenght of filament out I expected. I also had to do some work to get it to mount properly on my x carriage. I am very happy with the results I'm using a smaller Nema 17 that is much lighter than the original and it really prints nicely and more consistent than before.

BuildAThing,

How do you get the measurements correct. Is there a calibration guide that I can use? I have a pair of calipers that I recently just bought I'm guessing that I will need to measure out some filament, but is there an equation of a guide to get the right steps? Can you point me in the right direction?

Quote
dev0drps
BuildAThing,

How do you get the measurements correct. Is there a calibration guide that I can use? I have a pair of calipers that I recently just bought I'm guessing that I will need to measure out some filament, but is there an equation of a guide to get the right steps? Can you point me in the right direction?

It is actually pretty easy. You can first calculate it and then tweak with a ruler to close the accuracy gap.
The Titan is geared, its gear ratio is 3:1. The "hobbed" gear is 7.3mm according to E3D's WIKI site (https://wiki.e3d-online.com/wiki/Titan_Assembly). And I see on that site that I don't need to go much further to give you the details. There they have the equations for steps/mm:
200 * 16 * 3 / (7.3 * 3.142) = 418.5 for the 1.8 degree/step stepper motor (most common NEMA17)
400 * 16 * 3 / (7.3 * 3.142) = 837 for the 0.9 degree/step stepper motor

Dive into your controller board firmware and modify the line that looks something like this:
DEFAULT_AXIS_STEPS_PER_UNIT {44.34,44.58,800,44.44} (older Marlin firmware Configuration.h file)
These are the steps per mm for the X, Y, Z and first extruder. Substitute your correct steps/mm you calculated into the fourth number. Your firmware may have the axis and extruder settings on separate lines, or separate defines, it should be obvious.

DLC

DLC60,

Thank you so much! I was actually looking at the wiki at work after I posted this message. I appreciate all the feedback from you guys. I will update this post after I get the E3D Titan installed. I have already printer out the parts on my original extruder (which came out really great) and should be receiving my Titan tomorrow. I am looking forward to the weekend to get this all setup.