This is a basic model of the Z arms used in the Creality K1/K1 max. The stock one only has 4 holes and a single 1/4 turn of the pom nuts will move that corner of the bed up/down 2mm. As you can imagine that is far from ideal when trying to get a level bed. This model has 12 holes and therefore has the ability to adjust the bed 0.66mm on that given lead screw. It's not a perfect solution but it works quite well.

Print this in ASA/ABS or better. 0.2mm layer is fine, supports are needed.

This model was made with the help of Henlor who created the base cad model. I just added the extra holes to the model.