Slic3r and Marlin configuration for RepRap FW retraction

This one will be quick and easy. Recently I found out about wonderful feature of Marlin 3D printer firmware called firmware retraction. So what is the difference between firmware retraction and normal retraction made by Slic3r? It is easy, you can set different speeds for retract and recover.

Basically you can pull out the plastic really fast and save time but you can’t try to force the filament back in as fast as it would cause many problems.

When the recover speed is too big, you risk filament drive stripping piece of the filament and cause jam. Also there is a slight lag between the filament actually flowing out of the extruder nozzle, especially with bowden extruder setup. Newest Slic3r (tested with 1.2.6) has support for firmware retraction so you can easily try it out.

And it has one more GIANT advantage. You can tweak your retract during the print with simple G-code commands. That means no need to reslice the model just to tweak it! I love this!

via Slic3r and Marlin configuration for RepRap FW retraction – Prusa Printers.


Raspberry Pi Switches To Linux 4.1 as default kernel

Raspberry Pi

Raspberry Pi default firmware upgraded to Linux 4.1 as the latest stable kernel.

Linux 4.1 brings many new features and improvements and is now served as the kernel for the Pi’s default firmware. The source had been available for a while already with some RPi-focused Linux distributions like OpenELEC already having opted to utilize it for the newest Linux kernel capabilities.

The default source tree on is now rpi-4.1.y. This tree is now considered the stable kernel source tree and will merge in minor bumps to the kernel version, rather than rebase.
There is now a 4.2 kernel tree where more experimental kernel commits may go (in general moving closer to upstream).

More details on the kernel upgrade via this forum thread.