![]() It is a little misleading though as some moves are made with step rates between zero and the jerk speed.Įdited 2 time(s). ![]() The standard example is a rocket burning fuel at a constant rate, generating a constant thrust would have an increasing acceleration as the mass of the rocket reduced.Įdit 2: Jerk used to be called minimum speed, which kind of helps explain how jerk is applied if you think that speeds between zero and the jerk speed are missed in the acceleration. I'm trying to understand the exact application myself but I understand it is used to reduce the need to accelerate and decelerate on vectors as the nozzle is moved around a path.Įdit: For completeness compare the above to jerk in the maths world is a constant change in acceleration. In other words the highest step rate that can be started in a jump from zero and the stepper motor looses no steps. In reprap firmware it is an instantaneous speed change that can be tolerated by the system. Jerk is the derivative of acceleration in maths but not in the reprap firmware. Thankfully, someone has already modified the firmware to be compatible with the DaVinci, and there is a very good youtube instructional video on how to complete the process. Is Repetier blocking speed when in manual control? The DaVinci’s main board runs the same micro controller as an Arduino Due, meaning it can run the open source printing firmware compatible with Repetier-Host. I also fiddled with the acceleration (and it works as expected) and the infamous jerk (if it's the derivate of acceleration why is it m/s?) but it doesn't look like they are to blame for this.įor what I have understood, as I have eeprom enabled, any changes in Marlin won't change speed settings (?)Īny ideas of what I might have missed here? I have tried only with the graphical move commands in the Repetier soft. ![]() The, for me, curious thing is that if I fake the microsteppingin in Repetier (basically tells it to move the motor further to move a mm), the printing head maxes out.īut if I only set the maximum speed, there seems to be a very distinkt 'lock' at 50mm/s (give or take some). Software is Marlin & Repetier, with eeprom activated (took me some time to get that the overrides were in repetier after that switch). The setup is ATMega2560, RAMPS, CoreXY "classic" reinforced 20mm extruded aluminium frame and NEMA17 motors (some oversized but that's another story) Bowden setup with E3D hotend (The chinesium in the cheap one broke). Rubber feet mounted helped a bit, but microstepping made it go away totally! So that's great but the thing is that I now can't make the printer to move faster than, around 50mm/s. I had the printer set up on a cheap IKEA table, and it made a ringing racket from hell, the table makes some sort of resonance box like a guitar. I finally got it together!Īfter some initial hurdles, it works way over my expectations, so I'm entering the improvement/refinement phase. I set out to build a CoreXY printer 2 years ago, 1 happy move to another city, new job, school for kids, rust because of storage when searching for an apartment etc.
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