Parametric storage box with a compact locking pin
A locating lip seats the lid; a small removable pin holds it closed without a full-width latch housing. The assembly and use paths withdraw the pin before lifting the lid. Rounded corners, adjustable dividers and explicit fit controls keep the geometry useful. This is a digital prototype: print a local fit section and test retention before relying on it.
Ask for the sizes you want to tweak, e.g. “make the width adjustable”.
Specs at the default size
Measured from the actual build on a Bambu Lab A1 in PLA. Every number updates live when you drag a slider above.
- Overall size
- 120 × 88 × 52 mm
- Parts
- 3
- Filament
- 91 g
- Print time
- 2 h 17 min
- Build plates
- 1
- Supports
- None needed
Engineering checks
- Lid clearance in the FDM sweet spot (0.15–0.35 mm/side)0.25 mm per side
- Seated lid clears the box and dividersLip engages 6 mm; divider tops have 0.4 mm vertical clearance.
- Localized pin housingOnly 14.1 mm of the front carries the lock; 7.7 mm projection.
- Separate locked solidsShared-axis pin gap 0.25 mm; calibrate it separately from the seating lip.
- Locked pin opposes lid liftA real 1 mm lifting attempt meets the pin.
- Pin fully withdrawsAllow 16.1 mm hand-access stroke to the left.
Adjustable sizes
| Setting | Default | Range |
|---|---|---|
| Length | 120 mm | 30–240 mm |
| Width | 80 mm | 30–240 mm |
| Height | 50 mm | 15–200 mm |
| Wall | 2 mm | 1.2–4 mm |
| Lid clearance (per side) | 0.25 mm | 0.1–0.6 mm |
| Dividers (lengthwise) | 1 | 0–6 |
| Corner radius | 6 mm | 1–20 mm |
| Locking pin width | 3.2 mm | 2.8–3.8 mm |
Parts list
| Part | Qty | Size (mm) | Filament | Time |
|---|---|---|---|---|
| box | 1 | 120 × 88 × 50 | 65 g | 1 h 33 min |
| lid | 1 | 120 × 88 × 11 | 26 g | 39 min |
| removable-pin | 1 | 18 × 6 × 5 | 0 g | 5 min |
How to make it
- Set the outer box dimensions and dividers; the local lock projects beyond the front.
- Start with 0.25 mm lid clearance and print an ear/lid/pin fit section.
- Withdraw the pin to the left before lifting the lid. Check hand access and the modeled path.
Print tips
- Print the box upright, the lid outer face down, and the pin flat underside down.
- Inspect the roofed bores and ear roots in the slicer. The removable pin has no back-out detent; transport needs qualified retention.
FAQ
Why does my lid not fit?
Adjust Lid clearance in 0.05 mm steps after a same-material fit test. The pin has its own running gap, at least 0.25 mm, and also needs testing.
Is the locking pin captive?
No. It removes completely and must be kept separately when the box is open. It has no detent or tested vibration resistance.
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