My printer had some Z-axis issue. Here are the details:
When I was printing a model, the bottom of the model got bumpy edges(as shown in pic), and the height of the model was a little bit shorter(about 5% shorter).
I thought it might be caused by the Zsteppers/mm. But after I tweaked up the Zsterppers/mm, the problem remained. I realized that the extruder raised not enough at the beginning of the printing. So I print a small cube which hight is 2mm. And the following pic is the result:
Does anyone know what might cause this?
Thanks in advance.