Parametric Coin & Capsule Tray Generator
Print Profile(1)
Description
Parametric Coin & Capsule Tray
A fully parametric storage tray for coins and coin capsules. Whether you store your coins bare, in round capsules, or in square capsules — this tray handles all three. Coins stand upright in individual slots with a round cradle that self-centers and eliminates rattling. A finger slot in the floor lets you push any coin or capsule up with one finger, and a teardrop-shaped relief cut across all dividers means your finger never hits a divider edge mid-push.
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Supported storage types
- Bare round coins — the round cradle cradles the coin edge perfectly. Works with any bullion coin: Silver Eagle, Maple Leaf, Britannia, Philharmonic, Krugerrand, and more
- Round capsules — Lighthouse, Air-Tite, Quadrum, and others. Set capsule_od to the outer capsule diameter and capsule_thick to the assembled height
- Square capsules — switch capsule_shape to Square for a simple rectangular slot without the round cradle
Features
- Round cradle — capsule or coin sits snugly, self-centers, lifts out cleanly via the finger slot
- Optional finger slot — a slot in the floor lets you push coins or capsules up from below. Set finger_w = 0 to disable it entirely (useful for half-height trays where coins already protrude above the rim)
- Teardrop divider relief — a continuous relief cut along the base of all dividers so your finger moves freely when pushing coins up
- Full or half height — full height encloses the coin completely; half height lets the coin protrude above the rim for easy one-hand retrieval
- Fully parametric — any diameter, any thickness, any slot count
- 100% support-free — print floor on the bed, nothing else needed
Customizer parameters
Capsule / Coin Dimensions
| Parameter | Description |
|---|---|
| capsule_shape | Round or Square |
| capsule_od | Outer diameter or width (mm) |
| capsule_thick | Coin or capsule thickness — always measure with calipers! |
| inner_clearance | Side clearance in the cavity |
Reference dimensions — bare coins (no capsule)
| Coin | Diameter | Thickness |
|---|---|---|
| 1 oz Silver Eagle | 40.60 mm | 2.98 mm |
| 1 oz Silver Maple Leaf | 37.97 mm | 3.29 mm |
| 1 oz Silver Britannia (2013–) | 38.61 mm | 3.00 mm |
| 1 oz Vienna Philharmonic | 37.00 mm | 3.20 mm |
| 1 oz Gold Krugerrand | 32.77 mm | 2.84 mm |
For capsules: capsule_od = capsule outer diameter, capsule_thick = assembled capsule height. Values vary by brand — always measure.
Tray
slot_count (1–100), wall thicknesses, floor thickness, clearances, edge rounding, full/half height.
Tip: Bare coins are ~3 mm thick vs ~8.5 mm for capsules — you can fit far more in the same tray length. A 250 mm bed fits ~55 bare coin slots or ~20 capsule slots.
Finger Slot
Width, lead-in chamfer, teardrop relief radius.
Recommended print settings
- Material: PETG (recommended)
- Layer height: 0.2 mm
- Walls: 3 perimeters
- Infill: 15–20%
- Supports: none
- Brim: none needed
- Orientation: floor on the bed — the tray prints standing upright with the floor flat on the print surface. No other orientation needed.
Bed size guide
The tray length is determined by slot_count, capsule_thick, and slot_clearance. Rough estimates:
| Content | Thickness | Slots on 220mm bed | Slots on 250mm bed | Slots on 350mm bed |
|---|---|---|---|---|
| Bare coins (~3mm) | ~3.4mm | ~45 | ~55 | ~80 |
| Round capsules (~8.5mm) | ~9.1mm | ~17 | ~20 | ~28 |
If the tray is too long for your bed, reduce slot_count and print multiple trays.
Fit test
Before printing a full tray, set slot_count = 3 for a quick test print (~45 min). Check that your coins or capsules slide in and out smoothly, then adjust capsule_thick or slot_clearance if needed.
A note on how this model came to be
Like many of you, I had a growing collection of coin capsules and couldn't find a storage solution that really worked — existing models either made capsules impossible to remove cleanly, didn't fit my capsule sizes, or both.
I'm a software developer by trade, so problem-solving is second nature — but CAD is a different world. I'm being transparent here: this model was built with AI assistance through what the community calls vibe coding — describing the problem, iterating on the geometry, tolerances, and print orientation in conversation until everything worked. The round capsule cradle, the teardrop divider relief, the finger slot: every detail came from working through what actually annoyed me about existing designs and finding a better solution, one iteration at a time.
I'm publishing it because I figure if this was my problem, it's probably yours too. I hope it helps.
If something doesn't fit for your coins or capsules, check capsule_thick first — that one parameter fixes most fit issues.
What's next?
Depending on interest, future versions could include:
- Slab storage — a dedicated tray for graded coins in NGC/PCGS holders (different geometry, separate model)
- Lid version — a sliding or snap-fit lid to fully enclose the tray for dust protection and transport
If either of these would be useful to you, leave a comment — it helps prioritize what gets built next.
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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