Be sure to see my remix for updates, they are cleaner and better.

The base is 30mm to give good purchase and stability. Depth into the control surface is 4.5mm. Height to lower hole is 7.5mm and top hole is 10.75mm. Larger horn has one hole at 15mm. Small horn has one hole at 9mm. Mirror in slicer to create a left and right. Three different thicknesses of 30mm horn for varying strength.

These work perfect for foamboard planes like the FliteTest models. If you need control horns for balsa, coroplast or cut foam, check out this version that screws on. https://www.printables.com/model/1137367-rc-airplane-control-horn-screw-on-with-backer