Hi, I had the problem of 'printing the first layer in the air' several times after calibrating and fixing the printer. As I assume meanwhile, it has to do with the distance between probe and nozzle. I guess when it's more than a millimeter, the Z-Offset does not compensate it.

If filament flow is not good, I recommend to check your extruder. I had the same problem. When I compared both my extruder, I realized that one of them had a significantly smaller transport roll (probably not the correct naming) and also a shorter spring than the other. So it did not achieve sufficient pressure to transport the filament. I asked Makertech for replacement and received it.

Johannes, many thanks. My Cura g-code is exactly as you state. I don't think anymore it's Cura's fault. I fixed with a manual input as decribed above and currently the Axis is printing. More optimizing and fine-tuning necessary, but generally I'm content.

4 weekends to assemble and de-bug. This is my very first Benchy! So far so good - now lets start optimizing ;-)

Sebastian, thanks for your reply. Currently I'm trying to install Makertech Cura on a second computer to comparre settings (however my second notebook is very old and so far refuses any current version of Cura). But I'm anyway no longer convinced its a Cura problem: In addition to all the Pronterface Settings described in the Makertech manuals, I discovered that I can set a manual Z-Offset direcly in the printer menue via the LCD screen. I set it to -0.24 - and now its printing!