# How to make a lens cap nesting tray with vibe CAD

Organize detached lens caps by their actual outside diameters. Shallow circular nests and finger openings make each cap easy to identify, while avoiding a tight fit around spring tabs or textured edges.

Category: Photography. Difficulty: Beginner.

By partsforagents · AI-authored · Updated 2026-11-10.

## Make this project
An unvalidated storage tray, not a lens cap replacement or a dust-sealed optical container.

This recipe has not been physically validated. Create and inspect the exact CAD for your dimensions; a concept image is not an orderable CAD file.

## 1. Measure
- Outside diameter and thickness of every cap.
- Projection of release tabs or raised logos.
- Available drawer width, depth and closed height.
- Finger opening needed beside the smallest cap.

## 2. Give your CAD agent this prompt

Design a lens-cap tray with cap_diameters, cap_thicknesses, pocket_clearance, pocket_depth, finger_notch_width and tray_margin. Ask for missing measurements; do not substitute lens filter-thread sizes for cap outside diameters. Use shallow loose nests, readable size labels and opposing finger notches. Model caps as reference cylinders with tab exclusion zones. The tray stores detached caps and does not attach to lenses.

## 3. Model and inspect
1. **Inventory the caps** — Measure each physical cap around its widest outer features. Note tabs separately so the pocket can leave them free rather than pressing them inward.

2. **Arrange the nests** — Lay out the largest pockets first, then fit smaller caps between them. Leave enough material between neighboring finger notches to keep the tray coherent.

3. **Add readable references** — Put size labels on the flat space beside each pocket. Keep label recesses shallow and place the notches where fingers can approach naturally.

## 4. Check the prototype
- Compare a full-size paper layout with all detached caps.
- Review one pocket-edge coupon before selecting final clearance.
- Inspect the assembly for contact with release tabs or decorative protrusions.

## Avoid this mistake
Using the size printed on the lens as the pocket diameter ignores the cap's larger outer grip and release tabs.

## Choose the material
PLA suits dry indoor storage prototypes. PETG can also be explored; neither choice justifies a tight fit against delicate accessories.

## Order this part now

[Submit your CAD](https://partsforagents.com/for-humans?project=lens-cap-nesting-tray#workspace) or [connect your agent](https://partsforagents.com/guides/cad-to-print#connect).

Have the model ready? Upload the exact customer-approved file. Starting from this guide? Generate the CAD from your measurements, inspect it and export the revision you want made. Include this guide URL in the review notes; the file and approved specification determine the part.

Required inputs:
- Authorized exact CAD file
- Declared units
- Material family and requested grade/color
- Quantity
- Intended use and critical fit requirements
- Contact email
- Destination country and postal code

**No payment at submission.** Submit a nonbinding manufacturing request now; the exact reviewed offer and payment link follow when ready. Current firm production scope is reviewed PLA/PETG for eligible contiguous-US/DC delivery.

### Agent submission steps
1. **upload_cad_request** — Get authorization to store/process the exact exported file, then use its bytes and approved intake fields. Save the returned request ID and file SHA-256.

2. **get_cad_preflight** — Read measured geometry and unknowns for that uploaded file.

3. **set_manufacturing_specification** — Save the customer-approved manufacturing choices and returned specification fingerprint.

4. **place_order** — Submit order_type manufacturing with the real request ID, exact specification fingerprint, acknowledge_nonbinding true and a saved unique idempotency key. Include this guide URL in review_notes along with the approved requirements.

5. **get_order_fulfillment** — Use the returned order ID to read the authoritative offer and manufacturing progress. A recipe URL alone never identifies an order.

Reconcile an uncertain result before retrying. Reuse identical arguments and the same idempotency key; never submit a second request just because its payment link is pending.

## Machine-readable resources

- [This complete guide as JSON](https://partsforagents.com/vibe-cad/lens-cap-nesting-tray/guide.json)
- [All project guides](https://partsforagents.com/vibe-cad/catalog.json)
- [Exact tool schemas](https://partsforagents.com/tools.json)
- Full workflow MCP: https://partsforagents.com/api/mcp (authenticated)
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- Canonical guide: https://partsforagents.com/vibe-cad/lens-cap-nesting-tray