Honest John M50

Files included

• 7 STL files in millimeters — 10 assembled pieces using the stated quantities
• Individual editable STEP parts and an assembled STEP reference
• Separate multipart print-layout 3MF and assembled reference 3MF — geometry only
• Editable CadQuery source, parameters and regeneration instructions
• Assembly guidance, historical source notes, CAD previews and digital QA evidence

Version: Revision A — Prototype · November 5, 2026. Dimensions are in millimeters.

Use the print-part STL or 3MF files for slicing. The assembled reference shows the complete model and is not a one-piece print. STEP files open as solids in CAD software; the supplied source and parameters let you regenerate the parts.

Historical configuration

M38 practice-front exterior. Sourced dimensions and estimated details are distinguished in the package notes.

Before printing

Dimensions & fit

1:20 scale; 379.095 mm assembled height; 28.829 mm nominal main body diameter. Configuration: M38 practice-front exterior.

Build volume

Modular files and a separate print-layout 3MF are included. Check every part and rearrange the layout for your actual printer; no printer envelope has been physically validated.

Material

Filament, printer, nozzle and calibrated fits remain to be selected and physically tested.

Orientation & supports

The print layout places tubes upright, fins flat and the cap flat plug face down. Inspect the small transverse cord hole and any overhangs. Test the nominal 0.15 mm radial glue gaps with your printer before assembly.

Printer settings

Body walls are 2.0 mm, with 1.4 mm remaining below blind fin pockets; nose and shoulder walls are 1.6 mm. No tested printer profile, material or layer height is supplied.

Hardware

Adhesive and any display or recovery cord are not supplied. No motor mount, motor, launch hardware or flight recovery system is included. The cap, bond and cord attachment have no qualified load rating.