Lab & Workshop

Test Tube Holder Generator

Gridfinity-compatible racks for test tubes, vials, drill bits, and more.

🧪 Generate Your Tube Holder Now No sign-up. No CAD skills needed. Works in your browser.

🔧 Features

📐 Presets & Examples

Jump-start your rack design:

3×3 Gridfinity
16mm, 2×2 grid — Standard 16mm test tubes
5×2 Gridfinity
13mm, 2×1 grid — Narrow 13mm tubes, compact
3×3 Minimal Hex
16mm, 2×2 grid — Lightweight honeycomb
5×2 Minimal Hex
13mm, 2×1 grid — Compact honeycomb

🖨️ Print Recommendations

Frequently Asked Questions

What else can I use this for?

Drill bit organizers, pen holders, paint brush racks, makeup brush stands, spice vial holders, electronic component storage. Anything cylindrical that needs organizing.

Which style should I choose?

Gridfinity style locks into a baseplate and stays put. Minimal hex style is lighter, prints faster, and works standalone. Choose Gridfinity if you have a baseplate system; choose minimal for desk use.

Can I change tube diameter after printing?

No — the holes are fixed size. Measure your items first and add 0.5–1mm clearance. The parametric generator lets you dial in the exact diameter before printing.

What's the minimum wall thickness between tubes?

The generator automatically calculates minimum wall spacing based on your tube count and grid size. Choose a larger grid if tubes feel too tight.