Plastic shim
thingiverse
"Filler blocks" or also called "plastic shims" can be used as a wedge or spacer to align or level your construction work. I use them to level my plasterboards for walls or ceilings. I recommend creating different thicknesses, just deselect "uniform scaling" in Cura and make the z height a multitude of the layer height.
Download Model from thingiverse
With this file you will be able to print Plastic shim with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Plastic shim.