On Jun 28, 2012, at 9:54 AM, Ed Nisley wrote: > On Thu, 2012-06-28 at 10:50 -0400, John Stewart wrote: >> I don't remember being that impressed with their x/y speeds > > They tend to produce better results below 30 mm/s, mostly because the > stock firmware doesn't use any acceleration limiting at all, and I've > seen some down around 10 mm/s near my Sherline's limit. > > Using firmware that applies acceleration limiting helps with the > non-printing moves, but the plywood-and-acrylic frame isn't rigid enough > to print accurately much above 40 mm/s. The dreadfully heavy custom > build platform in my TOM requires a rather low acceleration, but even > the stock platform isn't a real featherweight…
I understand that the Ultimaker is currently the fastest (possibly highest quality too) hobby plastic extruder readily available. I think I recall reading that printing up to 400mm/s has been achieved, but 200-300mm/s is more realistic. Here is the "Sprinter" firmware: http://www.youtube.com/watch?v=bIBuUfd4cwY Here it is printing at 300 mm/s: http://www.youtube.com/watch?v=t5SoEdRzKlA >From the Sprinter firmware page: • The slow corresponds to the current default setting of sprinter, with an acceleration of 7000mm/sec^2, corresponding to an acceleration time of 14ms and a distance of 0.7mm to 100mm/sec. So, 0.25mm moves will never reach full speed. • The fast acceleration was 700000 mm/sec^2=acc. time of 0.14ms and a distance of 0.007mm. So basically, there is hardly any acceleration. I understand that it can print much faster than the Makerbots because the print head weighs much less (the Makerbot shleps 2 stepper motors around, the Ultimaker 0 stepper motors). I wonder how much faster one could be with servos instead of stepper motors. Also, the Ultimaker has considerably higher resolution. If I were to buy a standalone unit (and I am seriously tempted) I think I would go with the Ultimaker (larger print volume too). Best, Jeshua Lacock Founder/Engineer 3DTOPO Incorporated <http://3DTOPO.com> Phone: 208.462.4171 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
