[quote=“hoh61”]I don’t believe that Vellemann will do anything on this old device. Even the most obvious bugs were not corrected. It’s a pity that beginners with the K8400 still have to use 75% extrusion rate …
In the meantime I did some updates on the firmware. Initially to get rid of the major bugs (link somewhere in this forum), but that was not sufficient.
I did an update of the firmware by replacing the pressure advance fragments in MARLIN by my own code.
Actually I’m updating the temperature control routines to enable extruder wise optimization of the temperature stabilization. These routines needs to be amended further to include the fan impact.
Together with this modification the menu has to be updated.
For my approach I take the available firmware and introduce the new parts from MARLIN.
I didn’t check your version 1.5 yet, but I’m looking for a way to provide my version of the firmware to more users. Since I’m not familiar with maintaining a GITHUB repository, it could be advantageous to join the actual firmware flavors.
Unfortunately I cannot guarantee that my code is compatible with the Arduino IDE 1.6. I switched to the Eclipse IDE with the Arduino 1.5 libraries as background (Eclipse-Arduino).
So please can you give me your impression if a combined development seems feasible.[/quote]
Which branch of Marlin are you currently working on (1.x, 1.1.x), and how extensive are your changes?
Marlin 1.x only supports Arduino 1.0.6, with no active development happening. This is the same for my 1.x based firmware.
Marlin 1.1.x (still development, currently at RC7, approaching gold) supports 1.6.9. I wouldn’t foresee any issues bringing older code in, the changes should be minor.
I will have a Marlin 1.1.x branch with the Velleman additions very soon. I was waiting for the upstream Marlin to stabilise, which it now has.
As for combined development - sounds like a great idea. Hit me up on GitHub, we can at least create a new branch my repository for your changes.