A CNC dice box should let its owner store the set, lift out each piece and close the lid without forcing it. Design the compartments around the actual dice and the way they will be removed. A die that fits inside a CAD outline can still be difficult to grip, bind against a liner or keep the lid from closing.
The useful target is finished usable space: the room available after machining, lining and assembly. A compact storage case has a different job from a roomy rolling tray. Establish which job you want before choosing the pocket arrangement, then check a representative physical pocket before repeating it across the box.
Design for the Dice—and the Fingers That Retrieve Them
Imagine a hypothetical mixed set intended for a wooden gift case. One die is broad across its resting face, another is elongated, and a smaller die sits low in its compartment. If you are choosing among CNC Christmas projects for a regular tabletop player, this is a useful place to start: the recipient's actual set and storage habits give the design a purpose before a name or seasonal motif is added to the lid.
The broad die may determine the widest pocket, but the low-sitting die may be the hardest to remove. An outline that clears its sides does not necessarily leave room for fingertips to reach far enough down to grip it. Making that pocket deeper can bury the available gripping surface and make retrieval worse.
Arrange the actual set as it will be stored. For each die, consider its length, width and height in that resting orientation, including points or elongated ends. One nominal dice size cannot describe all those shapes. Also consider whether a die can settle into another orientation inside the proposed compartment; a layout that works only when every piece is placed in one precise pose may be inconvenient for everyday use.
Then try the removal motion. Does the owner lift the die vertically, tilt it toward an open side or reach beside it? A finger relief, an open approach or shared access space may help, but its shape should follow that grip. Increasing the pocket uniformly can enlarge the whole case when only one side needs access.
For the hypothetical set, the broad die needs sufficient sideways room, while the low-sitting die needs a shallower resting position or a more accessible approach. Those are different design changes, even though both might initially be described as a pocket that feels too tight.
Individual Cells or a Shared Well?
Individual cells give each die a defined location. They can make a mixed set easy to arrange and reveal whether a piece is missing, but every cell needs its own usable fit and access. Closely packed cells can leave the owner reaching into narrow gaps between walls. Giving each die a separate outline is therefore only part of the layout decision.
A shared well provides more freedom to rearrange the set and can offer a broader finger approach. It also allows the dice to move together and may require repositioning nearby pieces to retrieve a particular one. Choose it for flexibility rather than assuming that a liner will make the contents immobile or silent.
If the hypothetical owner values a fixed presentation and normally removes the whole set at once, individual cells may be worthwhile. If the owner frequently swaps dice or carries differently shaped pieces, a shared well may be more adaptable. A hybrid arrangement can reserve a separate space for an unusual die while leaving the others accessible together, provided the resulting walls and pockets remain practical to machine.
Keep storage separate from rolling space. In the comments on his original RPG Dice Box project, maker Ken Howard described the compact interior as storage and noted that it was small for use as a rolling tray. That observation concerns his particular design, but it illustrates why a storage layout should not automatically be judged as a rolling area.
Resolve the Closed Interior Before Decorating the Lid
The base pocket depth does not, by itself, establish whether the box will close. A flat lid contributes no additional recess above a protruding die. A recessed lid can contribute space, but only where that recess aligns over the object. A die near a lid wall cannot use empty volume elsewhere in the lid.
Howard's project used recessed halves rather than a flat lid; his explanation makes clear that both halves contributed to its closed interior. That is a construction option, rather than a depth recipe to copy for another set.
For the hypothetical mixed set, consider the closed lid above each die in its intended resting position. Check the tallest point, including a point near the edge of a die, rather than relying on its center height. If the lid supplies some of the clearance, its geometry must stay aligned with that position when the box closes.
Lining changes these relationships wherever it is installed. A bottom liner raises the resting position. Side lining reduces sideways clearance. Lining in the lid reduces the space above the dice. Evaluate the intended liner in the actual arrangement instead of counting on an unspecified amount of compression to make the box close.
Keep chosen hinge, catch or other hardware dimensions separate from the dice measurements. The hardware needs room without intruding into the usable interior. Exterior decoration belongs in the same model: an interior recess and an exterior engraving remove material from opposite faces of one piece. Resolve the material remaining between them before committing to deep personalization.
A Pocket Is More Than Its Maximum Width
A circular end mill leaves rounded internal corners when viewed from above. UNSW's tooling guidance explains this geometric limitation and identifies flute length, stickout and geometry below the holder as constraints on reachable features. For a dice case, the full pocket boundary matters: a rounded corner may occupy space needed by a pointed or broad part of the die, even when the pocket's maximum width appears sufficient.
Check that boundary against the die's resting shape and any movement needed to tilt and lift it. An attractive polygon on screen may need different corner geometry or more local room once the actual cutter is represented. Keep the access opening in that check as well; it must be machinable if it is to serve the finished box.
A flat-ended cutter is a relevant starting point for a flat-bottom pocket. CIMCO identifies flat nose end mills as tools for two-dimensional contours and pockets. Entry capability is a separate property, so the chosen tool's instructions must also permit the programmed entry move.
When comparing CNC router bits for wood, the TwoTrees wood-cutting spiral end mill provides a concrete flat-ended reference. Its listed two-flute solid-carbide construction and 3.175 mm shank identify the product. Match the exact tool to the holder, material, cutting depth and entry method required by your layout.
Avoid solving every fit issue by cutting deeper or selecting a smaller cutter. Extra depth reduces the remaining floor and can make retrieval harder. A smaller cutter may address tighter geometry, but it does not create finger access or establish adequate remaining walls. Consider the stock, pocket arrangement and exact tool together.
Allow for the Blank and Fixture
A compact finished case still needs a workable machining setup. The blank can be larger than the finished outline, and fixtures require space around or beneath it. The cutter and holder must reach the pockets without contacting clamps, walls or remaining stock. Keep the floor and walls represented in the model as pocket depths change; there is no universal minimum thickness suitable for every wood, span and construction.
The TwoTrees ED1 desktop CNC router is an enclosed platform whose manufacturer lists solid wood and a nominal 300 × 200 × 120 mm work area. Use those specifications to begin planning the complete blank and holding arrangement. The finished box's outer dimensions alone cannot establish whether the setup has the required space and tool access.
Use suitable, correctly rated tools and functioning guards; OSHA's woodworking guidance identifies tool projection as a machinery hazard. Follow the exact machine and cutter instructions, secure the stock and provide appropriate dust control. Stop and isolate the machine as directed before handling stock or inspecting a pocket by hand.
Try the Pocket That Will Tell You the Most
Before repeating the layout, make a representative physical pocket using the intended stock, liner and dice. Choose the difficult case rather than simply the largest outline. In this example, the low-sitting die may be the more informative trial because removal, rather than width, controls its usability.
Check that the die can be placed, gripped and lifted naturally. Include the intended finished interior and, where necessary, a representative lid arrangement. If the fit changes when lining is added, revise the usable dimensions before cutting the full set of compartments. An open pocket alone cannot settle a problem caused by the closed lid.
For the hypothetical set, retain individual cells if each provides a useful grip without making the case unnecessarily large. If the smaller dice remain awkward to retrieve, revise their resting depth or combine them into a shared access well. Confirm the closed clearance for the tallest die and preserve the required floor and walls before adding personalization.
The layout is ready when the actual dice can be stored, lifted out and enclosed in the finished interior. That physical use is the final check on the drawing.
