Purpose: This model provides a basic 4% grade designed to be placed under HO track to create an incline. 1. Practical Uses: It is used to establish a consistent slope for HO scale model railroading. 2. Included Parts: 4pct_basic_1.stl, 4pct_basic_2.stl, 4pct_basic_3.stl, 4pct_basic_4.stl, 4pct_basic_5.stl, 4pct_basic_6.stl, 4pct_basic_7.stl, 4pct_basic_8.stl. 3. Printing/Assembly Guidance: The designer recommends a 5% rectangular infill and testing between 0.15 and 0.3 printing heights. It is advised to avoid using a 0 bottom layer option to prevent the print from detaching from the base plate, unless a large brim is included.