Three-Spool Engine - Cutaway Display Kit
OVERVIEW This three-spool engine kit is an educational cutaway display project with an intended electric-motor drive and planetary gearing between its spools. The finished illustration shows the fan, exposed internal stages, central shaft, casing sections and rolling display support in a proposed metallic finish. The supplied design notes explain that the spool rotation order intentionally differs from the represented full-size engine. The publishing account has not tested a physical print, assembly fit or powered movement. DOWNLOAD CONTENTS The ZIP preserves all 111 supplied STL variants, the OBJ viewing copy, 20 technical image references, an English geometry inventory, a file manifest and three PDFs. The PDFs comprise a three-page preparation and hardware guide, two stand-drawing sheets and eleven engine-assembly sheets. Drawing geometry, sections, dimensions, callouts, hardware tables, projection symbols, scale labels and sheet numbers are retained. Author/export identity fields and the earlier identifying title blocks are replaced. Every public filename is an independent neutral identifier; no earlier-filename correspondence is included. GEOMETRY AND ASSEMBLY STL numerical facet data and OBJ geometric data retain their supplied coordinates and connectivity. Alternate brim/non-brim, support and section variants are separate resources, not a quantity of pieces required for one assembly. The STL parts are not all oriented for printing. Use the current inventory, drawings and selected geometry together before choosing a build sequence. Inspect thin blades, stators, shafts, bearing seats, couplings and shell edges. Work on copies when repairing, thickening, splitting or resizing. Small rotor/stator gaps require careful fitting and concentric alignment. PRINTING VALUES IN THE SUPPLIED NOTES - UNTESTED HERE The design notes describe most parts at 0.15 mm layers, a 0.4 mm nozzle and approximately 0.48 mm extrusion width. They report around 1.5 kg of filament for a complete model and a 240 x 270 mm bed that accommodated the largest part. These are retained source-note values, not validated settings or a certified minimum printer size. The notes describe overhangs around 55 degrees, bridges around 1.5 mm and one support-requiring part marked in the drawings. Confirm that marking, the actual orientation and your printer/material behaviour. The second-spool disc variants include a brim option for blade adhesion. Test a representative fragile section and fit before committing to the full set. HARDWARE AND DOCUMENTATION The guide transcribes the engine drawing BOM for bearings, screws, nuts and round aluminium tubing. The stand sheets retain the separate support and tubing requirements. The notes describe a geared DC motor, with 12 V and about 100 RPM offered as a design recommendation, plus a PWM controller, power jack, wiring and two-pin headers. Match the selected hardware to the actual drawings and mounts. Hardware, electrical parts, adhesives and tools are external components rather than extra printable resources. Technical photos include unpainted builds and close-ups for assembly reference; they are retained inside the download rather than used as the finished cover. DIMENSIONS, SCALE AND FINISH The technical drawings retain their A1 layout and 1:1 plotting labels. Those marks describe the drawing output and do not independently certify the STL unit system or a real-aircraft miniature scale. Confirm a known dimension and print scaling before measuring a paper drawing. Confirm slicer units, wall thickness, build volume and bearing fits. Uniform resize percentage is target length divided by current measured length multiplied by 100. Purchased hardware does not scale with the mesh. Recheck all clearances after resizing. Prepare a primer/paint sample, preserve fine blades while sanding and keep paint or adhesive away from fit-critical seats and moving gaps. Metallic surfaces and the dark support are a proposed display finish. IMAGE AND RIGHTS The cover is an existing locally generated ComfyUI/Qwen presentation checked against the supplied assembled-engine references. It is an AI-assisted finished-display illustration, not evidence of a physical print made or tested by the publisher. Background scenery is illustrative. Free CC0 redistribution follows the uploader's explicit authorization. The publishing account does not claim original design authorship or manufacturer endorsement. Private originals remain preserved separately. #JetEngine #CutawayModel #ThreeSpool #ModelMaking #3DPrinting #STL #CC0
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