Multi-Size Utility Key for Inspection Doors (5mm-9mm)

This model is a functional cross-key designed for operating various inspection hatches, cabinets, and service panels often found in plumbing, gas, or electrical installations. The tool features five distinct square drive sizes ranging from 5mm to 9mm, arranged on five horizontal. The central junction incorporates reinforced fillets to effectively handle the torque required for turning locking mechanisms.

The geometry is optimized to be printed flat on the build plate without the need for support structures. Given the mechanical stress applied during use, printing with a durable material like PETG or ABS is recommended. To ensure the square tips resist shearing or deformation, it is advisable to use a higher wall count (perimeters) and increased infill density.