3D Printing DnD Mini: How the Process Actually Works

• 1
  Key takeaways
• 2
  Why a 3D printing DnD mini is a resolution problem
• 3
  Resin, FDM, and machined metal compared
• 4
  Supports, orientation, and peel force
• 5
  Washing, curing, and the failure modes that follow
• 6
  When printing stops being the right answer
• 7
  Step by step: from file to finished mini
• 8
  Which process fits which mini

A tabletop miniature is small enough that its whole visual identity lives in a few square centimeters. On a 28 mm heroic-scale figure, the face is about 4 mm tall and a sword blade is often under 1 mm thick. Any process that builds the part in layers has to resolve those features without turning them into mush. That is why a 3D printing DnD mini is less about the printer and more about the numbers you feed it.

Layer height is the vertical step size. At 0.05 mm the steps are visible under raking light but disappear under primer. At 0.02 mm on a modern mono LCD printer they are below the eye's ability to separate at arm's length. The trade is time: halving layer height roughly doubles print time, and on a plate of eight figures that turns a two-hour job into a four-hour job.

The horizontal axis works differently. On an LCD or DLP resin printer the XY resolution is the pixel pitch of the screen, typically 0.019–0.035 mm on current machines. That pixel grid is usually finer than the layer height, so the visible surface quality is dominated by the Z axis. FDM is the opposite: a 0.4 mm nozzle sets a hard floor on XY detail, and no amount of tuning makes a 0.4 mm extrusion look like a 0.03 mm pixel.

So the first engineering question is not which printer is better. It is which axis of your model carries the detail. Faces, cloaks, and small weapons are all about fine XY edges, which pushes you toward resin. Large terrain pieces, bases, and storage inserts care about volume and toughness, which is where FDM is cheaper and stronger.

SLA, DLP, and MSLA all cure liquid photopolymer with light, but they differ in how the image is formed. A laser traces the layer point by point on SLA, a projector flashes the whole layer at once on DLP, and an LCD masks the light with a screen on MSLA. For minis, the practical difference is pixel size and light uniformity, not the acronym. MSLA dominates the hobby market because it delivers fine pixels at a low machine cost.

FDM melts and deposits thermoplastic filament. A 0.4 mm nozzle is typical, and 0.2 mm nozzles exist but clog easily and print slowly. FDM wins on large flat parts, mechanical strength, and cost per cubic centimeter. It loses on faces, fingers, and thin blades. If you print a 3D printing DnD mini on FDM, expect to sand, fill, and accept a softer silhouette.

Machined metal is the third path and it is not a printing process at all. A 5-axis CNC mill cuts the figure or a master pattern from aluminum, brass, or stainless steel. The resolution is set by the cutter and the toolpath, not by layers, so there are no steps to hide. GreatLight machines to ±0.005 mm with surface finishes from Ra 0.2–0.8 μm, which is far beyond what any desktop printer holds across a whole part.

The catch is cost structure. Printing is cheap per part and expensive per design iteration. Machining is expensive per part at low volume and becomes competitive when you need the same geometry repeated, or when the part must take a thread, a press fit, or repeated handling without chipping.

Every resin printer pulls the part off the release film after each layer, and that peel force is the single biggest cause of failed minis. The force scales with the cross-sectional area touching the film at that moment. A flat base printed parallel to the plate has a huge cross-section on layer one and can rip off the build plate. Tilt the model 15–30° and each layer presents a thinner slice, so the peel force drops.

Supports are the price of that tilt. They need to hold the part against peel and gravity while being thin enough to snap off cleanly. A common starting point is 0.4–0.8 mm contact tips on a 28 mm figure, with heavier 1.5–2.0 mm anchors near the base. Put contacts on the back, the underside of the cloak, and the base rim. Keep them off the face, the sword edge, and any surface the eye lands on first.

Support scars are permanent. They are cured resin, not a soft mark you can sand away on a 1 mm finger. If a contact point must sit on a visible surface, place it at a concave junction where a small nub reads as part of the sculpt. Rotating the model 10° around its vertical axis often moves a dozen contacts off the front without changing print time.

Hollowing helps large pieces and hurts small ones. A 28 mm figure printed solid is mostly fine and drains nothing. A 75 mm monster hollowed to 2 mm walls needs drain holes at the lowest points in the print orientation, or trapped resin cures inside and slowly leaks. Two 3 mm holes are usually enough. Any less and the cavity stays wet.

Washing removes uncured resin from the surface and from every recess. Two baths work better than one: a dirty first bath to strip the bulk, then a clean second bath for 2–3 minutes. Isopropyl alcohol at 90% or higher is standard. Skip the second bath and a thin film of resin stays in the crevices, then cures into a glossy, detail-blurring skin.

Curing sets the final mechanical properties. Under-cured resin is tacky and flexible; over-cured resin is brittle and yellows. Most gray and white engineering resins want roughly 2–4 minutes per side in a 405 nm curing station, but the correct number depends on wall thickness and pigment. Thin parts need less. A 2 mm base needs more than a 0.8 mm cape.

The most common failure on a 3D printing DnD mini is not a print failure at all. It is a break during support removal. The cause is almost always under-curing combined with contact tips that are too large. Cure first, then remove supports with flush cutters, then touch up with a 600-grit file. Flexing a partially cured arm is how elbows snap.

Dimension drift is the other quiet problem. Resin shrinks as it cures, typically in the 0.5–2% range depending on the formulation. If a mini has to fit a socket, a base ring, or a magnet recess, print a test coupon and measure it before you commit to a plate of twenty.

Printing is a layer process, and layers impose limits that no slicer setting removes. A printed thread on an M3 boss will strip under hand torque because the thread flanks are stair-stepped and the resin between them is weak. A printed press fit loses its interference after a few cycles. A printed master for a silicone mold wears at the parting line after twenty pulls.

These are the cases where subtractive machining takes over. A 5-axis CNC mill cuts a continuous surface, so a threaded insert, a keyed base, or a mold master holds its geometry across thousands of cycles. For a metal miniature, aluminum 6061 or 7075 gives a light, tough piece; brass and C36000 give weight and a traditional feel; 316L stainless handles oils, handling, and cleaning.

Machining also changes the surface story. Anodizing, black oxide, bead blasting, and laser engraving all apply to metal and none of them apply to cured photopolymer in the same way. If a piece needs a serial number, a name plate, or a durable matte finish, the metal route is the only one that holds up.

The decision rule is simple. If the geometry is decorative and the quantity is low, print it. If the geometry has to hold a tolerance, take a thread, survive handling, or be reproduced as a master, machine it. GreatLight runs one prototype to 10,000+ parts with no minimum order quantity, so a single machined master is a viable step before you commit to a mold.