Improve your Z Height Accuracy

thingiverse

The stepper motors controlling our printers move in "steps" of varying size. Most steps are found between full steps, with full steps being the strongest magnetic positions. When the Z-axis is positioned between a full step it moves towards the full step that attracts it most, turning the lead screw and altering the layer height. As a result, each Z-layer height not set to a full step value while printing becomes smaller or larger than intended. Over multiple layers this affects Z-height accuracy. I used the RepRap calculator to determine several favorable layer heights that eliminate this problem. This is a PDF with the next higher and lower full step values of common layer heights for printers using standard 5/16 ACME rod, which has a .2728 pitch. The HIC Prusa uses these rods. If your printer uses these rods, add a tag to this post. If your printer uses different rods, create your own schedule and post it as well. Or ask me to include it.