Here are 2 ways to get free tool plans from

1. Some tool plans are offered for free
rossbotics offers three different tool plans completely for free: Angle Plates, Knurling Tool, and Tilting Dividing Fixture.

2. Post the tool you built from plans
Post the tool you built from plans, and get ANY free plans of your choice. You can do this even with plans you got for free. And, you can do this repeatedly, to get more free plans. Details: How to get ANY tool plans for free.