Free download · G scale
Free coal load STL files for the Bachmann side dump ore car
Free STL files for eight hollow coal loads that drop into the Bachmann 92503 Side Dump Ore Car (Large Scale, 1:20.3), or any G scale mining cart with a 3 5/8 × 4 1/2 inch opening. Each load is open underneath, so an LED can sit inside and light up a load printed in translucent or glow-in-the-dark filament. Two sets: thin-wall loads for lighting, and standard loads for plain coal. No sign-up.
Coal for the night run
On the Wyldwood backlot the side dump cars run after dark. Ours are printed in a semi-translucent glow-in-the-dark filament with an LED tucked underneath, and the light carries up through the whole heap. Next stop is the layout at night, rolling through smoke-machine haze.
Hollow, with room for a light
Each load is a thin shell under a bed of about 1,900 individual coal chunks, open at the bottom with no legs or ribs inside. That keeps a load to roughly 50 grams of filament instead of a solid block, and leaves an 82 × 104 mm cavity for an LED board, an LED puck, or nothing at all.
Glow set or standard set?
The glow set thins the walls to about 0.9 mm and the roof to about 1 mm so more light makes it through, with a 1.35 mm rim around the base for handling. Print it on a 0.4 mm nozzle. The standard set keeps 1.35 mm walls throughout; print it in black or charcoal for coal that stays dark. Both zips include the fit-test ring.
Check the fit first
The loads were sized from a Bachmann 92503 Side Dump Ore Car: an inside opening of 3 5/8 × 4 1/2 inches and sides 1 1/4 inches deep, with 0.4 mm of clearance on each side. Other cars vary, so print the 6 mm fit-test ring before a full load. It uses a few grams of filament.
Specifications
- Fits
- Bachmann 92503 Side Dump Ore Car (Large Scale, 1:20.3), or any cart with an inside opening of 3 5/8 × 4 1/2 in (92.1 × 114.3 mm), 1 1/4 in (31.75 mm) deep
- Load footprint
- 91.3 × 113.5 mm, 0.4 mm clearance per side; tapers to 85.3 × 107.5 mm at the cart floor
- Height
- About 53 to 54 mm overall; the heap crowns 21 to 23 mm above the cart rim
- Underside
- Open, no legs or ribs; 82.6 × 104.8 mm cavity for a light
- Glow set walls
- 0.9 mm sides, 1.0 mm roof, 1.35 mm rim for the first 3 mm
- Standard set walls
- 1.35 mm throughout
- Files
- Eight STL loads plus a fit-test ring per set, millimetres, print at 100%
- License
- CC BY-NC 4.0: free to print, remix and share with credit; not for sale
Print settings
Glow set
- 0.4 mm nozzle, 0.20 mm layers
- 2 walls, 5 top and 5 bottom layers, 0% infill
- Your filament maker’s glow settings
Standard set
- 0.20 mm layers
- 3 walls, 0% infill
- Black or charcoal for unlit coal
Both sets
- Rim side down, as exported
- 5 mm brim
- Removable supports under the domed roof, pulled out through the open bottom
Questions
Will these fit my Bachmann side dump car?
They were measured from the Bachmann Large Scale Side Dump Ore Car (item 92503): a 3 5/8 × 4 1/2 inch inside opening with 1 1/4 inch sides. If your car measures the same, a load drops in with 0.4 mm to spare on each side. The same car in other colors likely shares the body, and the fit-test ring will tell you before you print a full load.
What light goes underneath?
Anything that fits the 82 × 104 mm cavity: a small LED board, an LED puck, or a battery tea light. Stick with LEDs; PLA starts to soften around 60 °C, so skip incandescent bulbs.
Do they need supports?
Plan on removable supports under the domed roof. They come out through the open bottom before the light goes in.
Can I share the files or sell prints?
Share the files and your remixes freely, with credit to Wyldwood Railway. The license is CC BY-NC 4.0, which means non-commercial: please do not sell the files or prints made from them.
Get word from the workshop
Occasional email when something new leaves the shop, free or otherwise. No noise.
Bachmann is a trademark of Bachmann Industries, Inc. Wyldwood Railway and Authentic Creative, LLC are not affiliated with Bachmann; the name only identifies the car these loads were measured for.