Customizable pair of dovetails the snug together into a joiner using the BOSL2 OpenSCAD library function dovetail() from https://github.com/BelfrySCAD/BOSL2/wiki/joiners.scad#module-dovetail

This is customizable in OpenSCAD, but not within the Thingiverse customizer because it doesn't have the full BOSL2 library installed.

The DovetailDemo.stl file is an example of a self-locking tapered dovetail for joining two parts.

The DovetailDemo_30degJoin.stl file is an example of a non-self-locking tapered dovetail for joining two parts.

The DovetailDemo_Wood0p5x6deg.stl file is a sample of a 1/2" tooth with 6° angles per side in 3/4" wood.

The DovetailDemo_BeadSightMarble.stl file follows the 3/8" dovetail with 60° angles, and a ~0.10" tall pattern of the front bead sights from https://www.marblearms.com/front-sights.html

The DovetailDemo_11mmRail.stl and DovetailDemo_3_8ths_Rail.stl are an 11mm dovetail and 3/8" dovetail for mounting optics and use the dovetail dimensions at https://huntinginaustralia.au/scopes/components/rifle-scope-rails/ -- 11mm dovetail is 11mm wide at the top, 60° angle, and 1.5mm tall, and 3/8" dovetail is 3/8" at the bottom, 45° angle, 1/16" high, and 1/2" at the top. The reason 11mm dovetail is measured at the top is because it is designed to register vertically off of the top surface, while 3/8" dovetail is designed to register vertically off of the bottom of the groove to allow for the roundness of the barrel/receiver. There are round-top 11mm rifles and flat top 11mm rifles If you don't match the dovetail form and angle, it isn't clear how the mating dovetail registers vertically.