A very basic 4% grade to place under your HO track to create an incline.
This design is about as basic as it gets
Tested between .15 and .3 printing.
Recommend %5 rectangular infill.
I would avoid 0 bottom layer option, as the print is very likely to fail (detach from base plate) unless a large brim is included.
Send me a message if you want any changes to this basic design.
The author hasn't provided the model origin yet.