The promise of the RXL's revolutionary leap beyond the current landscape of affordable FDM printers was in its speed. Most reprap 3D printers use an extruder mounted on the X carriage. This limits their speed. Other printers, like Ultimaker, speed things up by removing the extruder from the carriage and using a Bowden extruder. The downside to that approach is that anti-ooze retraction, used to prevent stringing, does not work well with a Bowden extruder. The RXL was to have the best of all worlds -- a super-light (<6oz) extruder (they call X-truder) combined with 2 X motors and 2 Y motors. In an early youtube video, they demonstrated 900mm/second travel speeds. Later, after they tweaked things, QU-BD was able to demo 500+mm/second ABS printing. For a reprapper like me used to speeds 1/10th of that, it was indeed a great promise.
The first thing I successfully printed with the RXL was a vase for which QU-BD included tweaked gcode to demonstrate the RXL's speed. That went well. I then moved on to printing a Filastruder hopper at conservative speeds:
After some success, I became more ambitious and set out to print an over-sized Eiffel Tower at 400mm/sec:
Check out the speed:
It seemed to be working great for a while but something seemed to "slip" somehow on my Y axis, causing the print to fail. I will investigate and figure out what caused this failure:
Stay tuned as I continue to put this machine through it's paces.