Design drawings suitable for additive manufacturing and/or integration of off-the-shelf items, for demonstrations of simple machines

I am seeking a freelancer to develop design drawings suitable for additive manufacturing and/or integration of off-the-shelf items, for demonstrations of simple machines. Specifically, the design will be for a mechanical system intended for educational use. I have specific requirements for the design, so a freelancer with technical knowledge and experience in this field is required for the job. The freelancer hired for this project will need to come up with design drawings from scratch that are tailored to my specifications. They must ensure that the design is suitable for the application and is easy for a third party to create. I am looking for a creative and knowledgeable freelancer who can provide unique and robust designs that take into account the materials and physics involved. I am also looking to receive advice from the freelancer regarding any innovations which may prove beneficial to the design. This project will require the freelancer to think critically and produce results that meet the needs of the intended demonstration. Successful completion of the project will be based on the freelancer's ability to generate efficient design drawings that meet the requirement of the requested machine design. Please contact me to further discuss the project details and required deliverables. As an example (and we have several), we have a sketch of a demonstration of the simple machine principles of wedge, screw, and lever - integrated together as a miniature log splitter. A wooden "log" which may be 1" diameter by 4" long, is positioned colinear with a wedge (e.g. the working end of a wood chisel), and able to be pushed by a student's finger (with likely no effect), or pushed by a screw within an elongated nut, with this nut and the wedge mounted on a base, and the log positioned in a v-block on the base. The screw has a head that can be rotated by finger or by wrenches of varying lengths, to demonstrate the mechanical advantage of the lever. The wedge and log would be inside of a plexiglass or otherwise see-through housing, for safety. The system would be able to be assembled and disassembled by students who are 10 to 13 yrs old. 3-D printer is available, as is small budget for purchase of off-the-shelf components. NEW UPDATE -- I INSERTED A DRAWING OF THIS FIRST EXAMPLE - Overall length can be up to 15 inches or so.