The Topple Target is a simple target that is easy to knock over when hit by even the lightest flying disc. It only works well on a flat surface, but you can put it on a book if the surface isn’t smooth.
You can find a .step file for the topple target here:
https://smalldiscgolf.org/wp-content/resources/step/
SDG-ToppleTarget1.step
The print requires support material under the disc. The print works fine even at a “draft” layer height of 0.35 mm.