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3D printing holds promise for students with blindness/visual impairments (B/VI) in addressing astronomy content, concept development, and providing access to information normally displayed visually. To bolster astronomy and STEM opportunities for students with B/VI, we developed the Career Exploration Lab (CEL), which employs tactile astronomy instruction via 3D printing and specially designed 3D-printed astronomy models. The students with B/VI assemble and use a desktop 3D printer. To date we have held ~20 week-long CEL summer camps in 12 states around the United States, serving a total of ~120 students with B/VI. Teachers of the Visually Impaired and STEM teachers attended an Educator Partner Institutes (EPIs) to experience the astronomy lessons and 3D models. 34 educators from 11 states have participated and assisted with our CEL summer camps. We gathered pre- and post-intervention data via surveys, astronomy assessments, and interviews, resulting in what is likely the largest research study to date on astronomy and 3D printing instruction for students with B/VI. We present our CEL approach, a sample of our lessons and 3D models, insights learned, and best practices. Once fully tested and refined, we will make our 3D models and lessons freely available. We find 3D printing is useful in showcasing scientific data for understanding and appreciation of astronomy.