100% INFILL ONLY
I MAKE NO GUARANTEES ABOUT THE SUCCESS OF THIS PRODUCT IN ANY FUNCTION -- USE AT YOUR OWN RISK!
This is a design I am currently working for a break away stirrup you can 3D print at home for custom sizing and a comfortable fit. I currently don't have access to a 3D printer so I am posting the design up without having done a test print first. If anyone makes a print of it please post a make of it and I will submit your picture as the cover artwork for this design.
The slots where the bar should slide out are directed towards the front of the horse when attached to the saddle. They should be able to slide fairly smoothly out of the slots and allow for an easy disengagement.
I recommend to use ABS or PETG for this project if available, and again both components are meant to be as solid as possible. I have not done a verification print so this is entirely as is and I don't know how strong it will turn out being.