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Hi Thorgal,

first of all, thanks a lot for designing this printer! I have no prior experience to 3D printing, so I have used this printer as an introduction in how 3D printers work and it was really a lot of fun building it (pictures of the build to follow).

I have finished building the printer and got everything working smoothly so far and the first few prints come out quite nicely. I just was wondering about one thing and thought someone from the community might advise on this.

For the default feedrates I have currently the following settings:

define DEFAULT_MAX_FEEDRATE {20, 20, 0.15, 3}

Everything is working fine like this, however, if I increase the feedrate for the Z axis (as I thought that is really was quite slow) even to only 0.2 and test Z axis movement in prontrface, the motors start to jitter and I do not get any reliable movement of the axis anymore, i.e. sometimes it moves, sometimes it doesn't. My Vref for the DRV8825 steppers that I have is set to 0.05V, and I have already replaced the motors (I have the 5V version), as I thought they might be the issue, but to no effect. It does seem to me that even at a max feedrate of 0.2 the motors do not seem to have enough torque anymore to move the Z axis. Is this low feedrate of 0.15 normal and do other people experience the same? If not - does anybody have an idea of what the issue might be?

Thanks a a lot and thanks again very much for all the work Thorgal!