They are 1.6mm thick with a 2mm thick ring around the connection hole. Holes in base ‘rivet’ it into surface with hot glue. Each have 1.5mm or 2mm hole option for different size pushrod or attaching a quick link.

File name indicates length of base and height of connection hole from mount surface and also the size of the connection hole.

Mirror in slicer to create left and right versions.

Print .2mm layer height, .4mm nozzle, 3 walls, 4 top and bottom layers to make it solid.

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