CornerDraft - Metric Corner Radius Templates | 8 Radii, 2 Pieces

CornerDraft is a pair of flat templates for marking rounded corners on paper, card and flat workshop materials. Each external corner has its own raised radius label. The central window lets you see layout marks and reduces material. Both templates are single pieces with no assembly.

Included templates

- A: 80 x 80 mm, with R5, R10, R15 and R20 corners.

- B: 120 x 120 mm, with R25, R30, R40 and R50 corners.

- Base: 2.4 mm; raised labels: +0.4 mm; overall height: 2.8 mm.

- Viewing windows: A 36 x 36 mm (R5); B 64 x 64 mm (R8).

How to use

1. Choose the corner labelled with the desired radius. R means radius in millimetres.

2. Put the smooth underside flat on the material, with labels facing up.

3. Align the two straight sections adjoining that arc with two perpendicular layout lines or the existing workpiece edges. The rounded corner must face the corner to be marked. Alignment is manual; there are no self-aligning stops.

4. Hold firmly and trace the external arc with a fine, upright pencil or marker. Check the print on scrap before marking a finished piece.

Printing

Print flat with labels up. Suggested starting point: PLA, 0.4 mm nozzle, 0.2 mm layer height, 3 perimeters, 5 top/bottom solid layers and 15% infill. Use a suitable profile for your own printer and material. The geometry is designed without supports. No printer-specific G-code is included.

Verification status

The exported models were re-imported and checked for closed mesh, one connected body, dimensions, nominal corner profiles, windows and joined lettering. Offline slicing completed with an isolated generic PLA profile. Physical printing, flatness and dimensional accuracy have not yet been tested. Tip width, tip angle, printer calibration and first-layer spread affect the final traced line. This is a manual marking template.

Files and images

Two STL files, two geometry-only 3MF files, two 2D SVG reference outlines, original parametric Python source and instructions. SVG outlines omit raised labels. Import in millimetres at 100%. The images are renders/projections of the actual STL geometry and a diagram of use. Colours and highlighted relief are illustrative; each model is one body.

Original design by MARGRAF ITALY. Creative Commons Attribution 4.0 International.

Italiano

Due dime piatte per tracciare raccordi esterni: otto raggi nominali da 5 a 50 mm, indicati sui rispettivi angoli. Finestre centrali aperte per vedere le linee di riferimento. Appoggiare il lato liscio, allineare visivamente i due tratti rettilinei e tracciare l'arco. Geometria e slicing verificati digitalmente; prova fisica, planarita e accuratezza non ancora verificate. Sorgenti modificabili, STL, 3MF e SVG inclusi.