Device for Applying Markings on Ground, Grass, Asphalt, and Other Surfaces
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The device is a mobile granular-material applicator
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Model information
- Source
- Printables
- Category
- RC & Robotics
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
Device for Applying Markings on Ground, Grass, Asphalt, and Other Surfaces
The device is a mobile granular-material applicator that operates on the principle of gravity-fed dispensing through a grooved metering roller. As the wheels roll, they drive the internal roller, which picks up a measured portion of powder and releases it through the outlet slot, producing an intermittent yet highly visible line on the surface.
I use this system specifically for marking out tracks for radio‑controlled model training sessions and competitions.
Material Compatibility
The applicator works with any powdered material—chalk, gypsum (alabaster), cement, or flour, for example. The essential requirements are that the material be in powder form and completely dry to prevent clumping and clogging of the dispensing mechanism.
Wheel Options
Two types of drive wheels are available, selectable according to the surface:
Smooth wheel – For hard surfaces such as asphalt, I recommend fitting an old tire over it to increase traction.
Toothed (lugged) wheel – For soft ground or grass, print and use this wheel as‑is for optimal grip.
Dosing Control
The model includes two variants of the internal metering wheel, featuring 2 grooves or 3 grooves, which regulate the volume of material dispensed per revolution.
Printing Recommendations
For durability and reliable performance, use the following settings:
Wall count: 4–5
Infill density: 60%
Layer height: 0.2 mm
Top/bottom solid layers: at least 8 each
Internal metering wheel material: PETG or high‑strength PLA
Main housing material: PETG or ABS
Additional Components Required
Axle: 5 mm diameter, 120–160 mm in length (preferably stainless or corrosion‑resistant steel)
Bearings: 2 pcs, sealed with rubber washers, dimensions 5×11×4 mm
Screws:
6 pcs, M3×12 mm, countersunk head
2 pcs, M3×8 mm, countersunk head
Pipe: 50 mm diameter drain pipe, approximately 1 meter in length (serves as the handle and material hopper)