EWC3 Labs Test Hole Generator (OpenSCAD)

Parametric test-hole plate generator for 3D printing.

This repo is intended to be cross-post friendly (GitHub + Printables + Thingiverse): source is in src/, and ready-to-print exports are in exports/.

Photos

• images/printed_plate_1.jpg (REQUIRED before public release)
• Optional: images/printed_plate_2.jpg

Print settings (known-good baseline)

Setting	Value
Nozzle	0.4 mm
Layer height	0.2 mm
Material	PLA (baseline)
Walls/perimeters	4
Infill	20%
Supports	No
Brim	Outside / Mouse Ears, .02 spacing
Orientation	Flat on bed

First layer (critical for test-hole accuracy)

Elephant’s foot will undersize holes and can force you to deburr dozens of edges.

• Elephant foot compensation (e.g., OrcaSlicer) SHOULD be set unusually high for this part.
• If your slicer uses “First layer X-Y compensation” (or similar wording), use that.
• A starting point is 0.5 mm; tune up/down for your material and first-layer squish.
• A brim SHOULD be used on plates this large to prevent warping; “easy to separate” brims defeat the purpose so space the brim .02 from the part so it actually sticks.

Files

Ready-to-print (download these)

• exports/stl/ — STL plates (example configurations)

Source (edit these)

• src/test-hole-generator-v2.scad — canonical OpenSCAD source (hybrid trapezoid/rectangle)
• src/test-hole-generator-v2.json — Customizer presets (useful printable configurations)
• _ARCHIVE/src/ — older entrypoints kept for reference

What it generates

A plate with rows of increasing hole sizes (circle/square/hex), with readable row labels.

Key features:

• Fully parametric (OpenSCAD Customizer-friendly)
• Multiple hole shapes (circle, square, hexagon)
• Row labels so you can quickly identify a fit

Customize

Open src/test-hole-generator-v2.scad in OpenSCAD and use the Customizer to change:

• size range (initial_hole_size, final_hole_size, hole_step_size)
• hole count per row (holes_per_row)
• spacing, margins, and plate thickness
• hole_type (circle/square/hexagon)
• plate_shape (rectangle/trapezoid)
• typeface_preset (e.g., arial_black on Windows, liberation_sans_bold on most Linux)

Export

• See docs/EXPORTING.md

Cross-posting

• See docs/CROSS_POSTING.md

License

MIT. See LICENSE.

When cross-posting to Thingiverse/Printables, select the MIT license to match.