HO (1:87) master STL of an unbranded school-band trumpet modeled as a small but sturdy scenic prop. Key details: flared bell, curved leadpipe, three-piston valve stack with raised caps, integrated mouthpiece receiver (no separate tiny mouthpiece), simplified tuning slide and tubing braces. The trumpet is designed to read visually on HO figures while avoiding fragile micro-parts. This purchase includes one locked 1:87 STL. To print at other scales, uniformly scale the HO master in your slicer (scale X, Y and Z together). Example conversions: to 1:48 scale multiply by 87/48 ≈ 1.8125; to 1:160 multiply by 87/160 ≈ 0.5438. Printing guidance - Resin: best fidelity at 25–50 μm; orient bell up and support braces and underside of leadpipe. - FDM: HO small details are difficult; consider 1:48 or request a reinforced variant. Typical uses include school marching band vignettes, parades, bandstand displays and equipping HO musician figures. Contact us for custom modifications (separate mouthpiece, thicker braces, peg mount).

Available railroad scales: Z (1:220), N (1:160), HO (1:87.1), S (1:64), O (1:48)

Ready to print digital download in one piece with no assembly needed.

IMPORTANT: You are purchasing the file in the scale selected below.

Miniature Reality Makes practical, print-ready scenery and vehicles so you can economically fill out the background of your layout, diorama, or tabletop without paying centerpiece prices for everything (Our hobbies are dying because the average person can't afford to enjoy them, we want to help fix that). We want your miniature worlds to feel real and full of life - with more variety, more detail in every scene, and prices that won't hold you back.

Miniature Reality Personal-Use License (No AI / No Resale)

• Allowed: personal printing for your own layouts, dioramas, tabletop games, and personal display.
• Not allowed: sharing or distributing the digital files (free or paid), re-uploading to any site, bundling, remix resale, or selling/redistributing printed outputs.
• Not allowed: using the files (or derivatives) to train, fine-tune, test, or feed any AI/ML system (including dataset creation).
• Not allowed: commercial use of any kind without a separate written commercial license from Miniature Reality.
• Enforcement note: digital files may include purchaser-linked identifiers / forensic watermarking to help investigate unauthorized distribution.