This is a modular coat hanger made with dowels and 3d-printed items. 

The model is parametric. Click the customize button to change the size of the dowel to make it fit your dowels. There is a test-ring print amongst the files that you can print to do a test fit with your dowels. Mine where marked as 33mm but in reality where 32.9mm when measuring with a calliper. If it's a tight fit - a light sand will do the trick. 

All the models that need extra safety or rigidity have screw holes on the back. 

The video features the making and the model: