Intended for outreach and educational purposes, these models show the structure of a typical PWR-type nuclear reactor core and zirconium-based fuel assemblies. The designs are based on publicly available information, and draw inspiration from several real-world examples. The reactor core model can be taken apart to reveal a grid of fuel channels, and demonstrate the offline-refuelling process. The design is given in several file formats to suit a variety of requirements, and includes: RPV Model 1/100-scale reactor pressure vessel model 1/100-scale fuel assembly Display stand Human figurine for scale Fuel Assembly Model 1/10-scale PWR fuel assembly Display stand These have been test-printed on a Bambu Labs A1 Mini 3d printer, using PLA through a stainless steel 0.4mm nozzle. The extrusion setting is '0.08mm Extra Fine' as per the specifications in Bambu Studio, and the recommended infill is 5-10% (gyroid). A wall thickness of 3 loops is recommended, as well as organic tree supports for the rounded components of the RPV model. Supports are also recommended for the fuel assembly model. Estimated print time: 2-3 daysFilament cost: 515g