The bottleneck is Marlin on the 8 bit 16 MHz AVR chip. There is no easy way to make it faster. Going via the P2 is no overhead.
My experience with OctoPrint on RPi is the USB is 100% reliable so I just upload to the RPi and print over USB.
To put files on the Melzi SD card I plug it into my PC unless it is a short file. If you don't have a PC nearby you could plug it into a USB port on the RPi and load it much faster.
I find with anything I design in OpenScad USB is fast enough as I limit segments to 0.5mm with $fs. Also I think Skeinforge merges short segments. The only time I found USB not fast enough is when printing Owls and Yoda sliced with Cura, which gave ridiculously short segments.
The other thing to be careful of is the RPi camera can use all the CPU if you don't limit its bandwidth.
Edited 2 time(s). Last edit at 03/03/2015 03:33PM by nophead.
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