http://www.thingiverse.com/thing:710309 Bowden printing at high speed causes lack of beads and threads. To care for a smooth build and release the pressure in the head. Useful for printing using a bowden. Allows you to slowly build up the pressure. Before the end of the working path gradually releases it. Result At the start of the path, no gaps or holes in the material from the lack of plastic. Has options for precompress and postrelease of filament for good print at high speed printing. It modulate the speed of movement of the head. This is not the same as the acceleration !! :) https://www.youtube.com/watch?v=q1uyDekTJ7o version 141124 ./em.py [options] [values] FILE options: --help - help --deb - debug mode, don't save file only verbose values: --ds=n - distans from start def(20.0)mm --fs=n - feed rate from start def(20.0)mm/s --de=n - distans from end def(20.0)mm --fe=n - feed rate from end def(20.0)mm/s --accu=n - accuracy of xy pressent is 1 digits pas coma --asso=n - associate tracks in distance les then def(0.3)mm --ahead=n - ahead (prsecompres) def(0.3)mm --tail=n - tail relase def(0.4)mm ./em.py <your file .gcode> or ./em.py --ds=20.00 --fs=20.00 --de=25.00 --fe=20.00 --ahead=0.2 --tail=0.3 or ./em.py --spring=1.0 for example my delta printing 120mm/s need ./em.py --ds=20.00 --fs=20.00 --de=25.00 --fe=20.00 --ahead=0.5 --tail=0.4