90D Lens Case – Hidden Snap & Magnets | Volk Compatible

A rounded triangular case designed for the Volk Classic 90D (V90C) lens, with a plain flat lid, soft TPU cushioning and two closing mechanisms: an integrated hidden click latch and paired magnets.

FEATURES

• Concealed flexible latch printed directly into the base—no separate latch or mounting screw.

• Magnetic closure using four 6 × 2 mm disc magnets.

• Soft TPU lower cradle and upper pad.

• Plain, flat lid exterior.

• Approximately 76 × 80 × 34.35 mm; about 86 mm deep including the hinge.

• Small closure-test pieces and a magnet-depth test included.

• Optional shims accommodate magnets thinner than 2 mm.

PRINTING

Shells: PETG, 0.2 mm layers, 6 walls, 6 top/bottom layers and 35–40% infill. Check that the thin spring prints solid. Keep the supplied orientation: base bottom down, lid exterior face down.

Liners: flexible TPU, 0.2 mm layers, 3 walls and approximately 10–15% infill.

Use removable support for the rear hinge where needed. Import all STL files at 100% scale in millimetres. PLA is not the intended material for the working latch.

IMPORTANT: FREE THE LATCH

Three tiny sacrificial printing supports sit beneath the spring. Carefully cut their narrow necks immediately below the beam and remove loose material. Leave the broad spring root attached. Do not pull or twist the spring to break the supports.

Check that the spring moves inward and returns freely before closing the case.

HARDWARE

• Four axially magnetised 6 mm diameter × 2 mm thick disc magnets.

• One M2 × 50 mm hinge bolt, thin washers and locking nut.

• Suitable adhesive for the magnets.

MAGNET FIT

The pockets are 6.4 mm diameter and 2.0 mm deep. Optional 0.2 mm and 0.4 mm bottom shims accommodate thinner magnets.

Dry-fit before gluing. Magnet faces should finish flush or slightly recessed so the shells can close fully. Check attracting polarity before bonding and allow the adhesive to cure completely.

ASSEMBLY

Test the small closure pieces first, initially without magnets. Assemble the full empty case, check the hinge and latch, install the magnets, then fit the soft liners.

Check with the supplied nominal dummy before inserting your lens. Ensure the cushioning contacts the metal lens ring only and does not press on the glass. Close by pressing the lid down; open by lifting at the front scoop.

VERSION AND TESTING

V7 integrates the latch into the base and uses shallower magnet pockets. The previous separate-latch version was physically tested and worked. This integrated revision passed digital mesh and sampled opening-clearance checks; its physical durability and drop resistance have not been established.

Gallery images are CAD renders, not photographs of a finished print. CAD geometry was developed with AI assistance.

Independently designed accessory compatible with the Volk Classic 90D. Not manufactured by or affiliated with Volk. Compatibility with other 90D lenses has not been verified.