Printer: Delta / Kossel mini (Atmel 2560, Ramps 1.4)
After upgrading from Marlin 1.1.0-RC6 to current 1.1.9 (with bugfix) my printer moves with wrong speed. For testing I use a cylinder (d=30mm) with spiral vase. The G-code was created using Slic3r and I checked it manually. The walls eg. should be printed with F180 (approx 3 mm / sec) - which works fine with the old 1.1.0 - the same G-code on 1.1.9 runs approx 13.5 mm / sec (which would be F810), which is approx 4-5 times faster.
In addition, all the print movements are not smooth, but rather "stuttering", which creates poor outer surfaces. Its like the acceleration/deceleration is not handled properly. I also thought the block buffer is not properly filled using OctoPrint, but the behaviour is the same when printing from SD-card. Then I took a stop-watch and noticed that the print speed is wrong.
The dimensions of the printed parts are accurate.
I can easily downgrade to 1.1.0 and the printer runs nice, go then to 1.1.9 and its bad again
I havent check the "home" and other movements using stopwatch, but they appear to be not much different between 1.1.0 and 1.1.9
Is there maybe any "motion improvement" between 1.1.0 and 1.1.9 which might cause this ?
I'm using the example/config files for a Kossel mini and did only modify some heat settings and adopt the geometry of my printer - nothing that would affect speed planning.
I was trying to check both sources, but there are so many changes that I was so far not able to see what might cause the problem.
thanks in advance
After upgrading from Marlin 1.1.0-RC6 to current 1.1.9 (with bugfix) my printer moves with wrong speed. For testing I use a cylinder (d=30mm) with spiral vase. The G-code was created using Slic3r and I checked it manually. The walls eg. should be printed with F180 (approx 3 mm / sec) - which works fine with the old 1.1.0 - the same G-code on 1.1.9 runs approx 13.5 mm / sec (which would be F810), which is approx 4-5 times faster.
In addition, all the print movements are not smooth, but rather "stuttering", which creates poor outer surfaces. Its like the acceleration/deceleration is not handled properly. I also thought the block buffer is not properly filled using OctoPrint, but the behaviour is the same when printing from SD-card. Then I took a stop-watch and noticed that the print speed is wrong.
The dimensions of the printed parts are accurate.
I can easily downgrade to 1.1.0 and the printer runs nice, go then to 1.1.9 and its bad again
I havent check the "home" and other movements using stopwatch, but they appear to be not much different between 1.1.0 and 1.1.9
Is there maybe any "motion improvement" between 1.1.0 and 1.1.9 which might cause this ?
I'm using the example/config files for a Kossel mini and did only modify some heat settings and adopt the geometry of my printer - nothing that would affect speed planning.
I was trying to check both sources, but there are so many changes that I was so far not able to see what might cause the problem.
thanks in advance