I am not sure whether its an actual problem with S3D or my printer but print time is 2-3 times slower than what S3D calculates. the print quality is pretty good, but the speed seems off Has anyone noticed this ?
I find it to be off by a 10-30% only. But then I've also found I can twist the FR on the printer up to 130% with no appreciable loss of quality so it works out ok
Yes, I had a thread about this as well. Try a vase mode print of something simple and the times will be pretty close. I believe the acceleration or jerk settings are more limiting than simplfy3d could guess so that's what's causing the disconnect. I generally double any estimates I have if print is complex
Yes its very frustrating, I intend to start tweaking the jerk and acceleration settings I just watched this youtube video so know what my plans are for the weekend. https://www.youtube.com/watch?v=7HsIZuj9vOs
I compared those settings with my ultimaker, some where ten times higher 4h37 on a 2h50 print , its almost 65% extra You can easily deduce that print speeds are a mere 20 to 25 mm/s instead of the promised 50 mm/s I will try a print at 50 mm/s and one at 25 mm/s realy wonder what the difference will be
a) remember that Simplify3d has a number of "underspeed" settings including for "perimeters" and infill. New users don't notice these and that a lot of things are slowed down by parameter; b) on shorter moves no printer reaches "top speed" and the time for the manoevre is very much related to ACCELERATION; of course it is true that the Ultimaker has phenomenal acceleration..... (due to the fact the print head weighs about as much as a grape)
I had already adjusted those settings accordingly, I do have experience with it. I was printing both the rear y axis braces, these are no small pieces. fact is, with the current settings, the printer is nowhere near capable of the average 50 mm/s printing speed that was promised. Even the benchy with the standard PLA profile took 1h45 instead of 1h15
I printed a vase in spiral mode that was almost a square, print time was very close, so I don't think speed is an issue and it is reaching 60. As R Design says it's limits in jerk and acceleration which is causing any print with lots of turns or changes in directions (like infill...) to slow down as simplify3d doesn't know the jerk or acceleration limits of your printer. I think that if we increase some of these limits we will see print time improvements but at the possible cost of lower print quality.
I guess it just means the default profile is set to very conservative speeds. You can keep increasing them yourself to see how fast it'll go before it affects print quality.
Ok I have done 4 testprints with 4 different speeds I have printed the Y axis cable bracket with identical settings except the basic print speed Speed / Calculated / Actual print time / Difference in % 29 mm/s / 38 mins / 45 mins / 18.42 % 35 mm/s / 32 mins / 38 mins / 18.75 % 50 mm/s / 23 mins / 34 mins / 47.8 % 60 mm/s / 19 mins / 32 mins / 68.4 % All 4 prints have absolutely no difference in print quality and it also happens with the vanilla PLA profile So @Greg Holloway , whats going on ? this is nowhere near the promised 100 mm/s
I am actually looking for an explanation on why it was tuned so low ? Are there mechanical reasons, electronics ?
@Falc.be can you try this if you get a moment to see if our times are aligned, download this part: http://www.thingiverse.com/thing:18672 scale it to 50% or something and print in vase mode. My time was within minutes of the estimate as its generally pretty straight lines so not affected as much That will hopefully convince you that its just the acceleration settings rather than anything else! Also change infil to rectinliner rather that triangles for less changes in movement @Greg Holloway any recommendations for experimenting with acceleration and jerk settings?
Tom has done a piece on this: The default settings are obviously our starting point and it's trial and error all the way up from there. Presumably the Titan will enable dual users - all things being equal - to accelerate faster? With a bit of luck I'll be able to mount a lightweight geared extruder on my Pro too! btw. max speed is currently firmware limited to 150mm/s. We can play with that too. But only relevant on the long straights. Another data point: Richrap does his long big prints at 70mm/s.... (Which are pretty much all perimeter - little / no infill.) Probably the speed-limiting factor there is print quality....
You can change any numbers you want guys & gals. I'd suggest small increments. The disparity between the S3D print time and the actual print time is due to acceleration. It assumes full print speed for all motions.
Well, when the UltraBigBox comes out, we can use NEMA 42s which will take care of that little acceleration issue!
Using a standard 0.4mm nozzle and extruding at the default 0.48mm extrusion width and X mm/s ? Want a 50% speed bump, independent of acceleration? Try a 0.48 * 1.5 = 0.72mm extrusion width! (Richrap pointed out that the flat bit at the tip of the nozzle allows you to extrude up to 2.5 times nozzle width. I haven't gone that far, but a modest increase gives all the plastic-related advantages of a nice steady extrusion and brings no (motion or plastic related) speed artefacts!)
