Modular Laboratory Bracket — Fully 3D Printed

A fully 3D-printable modular bracket system for any workbench or laboratory desk. We built it during our course at NaUKMA to solve an everyday annoyance: having to constantly grab your phone to check a datasheet while your hands are busy with electronics, soldering, or a robot build.

This bracket holds your phone exactly where you need it — and nowhere else.

✨ Highlights

• 100% 3D printed — no screws, no bearings, no magnets, no metal hardware. Every single part comes off the build plate.
• Rubber-band tension — the phone holder grips your device using standard office rubber bands. Cheap, replaceable, surprisingly strong.
• Modular by design — quick-change interface lets you swap attachments without disassembly.
• Step-rotating joints — incremental positioning that locks in place and won't slip under load.
• Tool-less assembly — printed bolts and knobs only. Snap it together, clamp it down, done.

🧩 The System

Four modules, designed to work together or independently:

1. Desk Mount — sturdy clamp base that mounts to the table edge using printed bolts.
2. Step-Rotating Joint — incremental rotation mechanism with secure fixation.
3. Extension Module — adds reach and provides two-axis adjustment.
4. Quick-Change Phone Holder — rack-and-pinion mechanism that grips phones of various sizes.

Fully modeled in Fusion 360.

🖨️ Print Settings

⚠️ Don't skimp on wall count. The clamp and step-rotating joint take real mechanical load — 3 walls is not enough. PLA also works for testing, but we don't recommend it for the clamp under long-term tension.

🔧 Assembly

No tools required. All fasteners are printed. Tighten the printed knobs by hand — they're sized for a firm grip without overtightening.