Miniature resin: detail, breakage and post-processing

What detail really means on a miniature

The Formlabs miniature guide identifies two factors that affect visible print quality: layer lines and support structures. In its examples, it explains that thicker layers make stair-stepping more visible on flat or slanted surfaces and can make round surfaces look pixelated; thinner layers improve surface appearance. This concerns the height of the printed layers in the examples, not a complete measure of resolution or feature fidelity.

In this guide, Formlabs cites SLA layers as thin as 25 µm depending on desired quality; it gives about 100–110 µm for SLS and binder jetting, whose layer lines can be hard to see on finished parts. These are comparative examples in the guide, not universal machine limits. Layer thickness is the vertical height of a slice; it does not measure horizontal resolution or the smallest reliable feature on a particular resin or model.

A sheet listing a fine layer height therefore does not guarantee that a miniature sword or face will look crisp at the chosen scale. The guide describes how supports and orientation affect surface finish and removal; the two sources give no universal minimum-detail threshold. Check the printer’s XY resolution, process, exact material, model and supports in their respective documentation. The 3D printing resins page compares broad families but does not replace a grade’s own sheet.

Brittleness: what the sources say and what they do not

The Formlabs guide does not compare the strength of miniature resin grades. It specifically describes binder-jetted parts as very brittle and porous; complex models may fracture during post-processing. That observation concerns this process and the guide’s examples, not SLA or LCD resin. The two documents cannot diagnose why a particular miniature broke or attribute a break to washing, support removal or sanding.

A trade name or “8K” label alone does not establish a miniature’s mechanical performance. For a specific reference, look for measured properties, grade, version and test method in the relevant documentation; these two sources provide no comparable mechanical data for SLA/LCD miniature resins. Without such data, state what remains unknown instead of drawing a conclusion about a two-millimeter spear or a durability level.

Tie the choice to the handling you expect: display, repeated gaming use, transport and a molding master raise different questions. If impact resistance matters, check that published data applies to the exact reference and a relevant test; these sources do not validate any resin for a particular use. Formlabs places SLA highest in its own comparison of appearance and finish across processes; that is neither a strength ranking nor an independent validation.

A use-case matrix to decide before you buy

Build the checklist around the destination: a painted display miniature, a gaming piece that is handled and transported, or a master intended for molding. The Formlabs guide discusses tabletop-gaming communities and silicone molding, pewter casting and lost-wax casting as applications for the SLA material range. That does not show every resin is suitable for molding or a handled part: verify the exact grade and process. Record thin areas and expected handling as design questions, not as proven breakage.

For larger, less detailed scenery, the guide quotes Jaco Snyman saying he uses FDM for those pieces or some mold-making workflows and mostly reserves SLA for final parts because of the finish. This is a workshop example quoted by Formlabs, not a test by this site or a general rule about cost, size or resin. Compare processes against your documented requirements rather than looking for one universal formulation.

In each cell of this matrix, write down the exact resin reference you are considering and what its sheet promises. If you are still weighing filament against resin for a whole project, the FDM vs resin guide walks through the general trade-offs. Your overall budget depends on the printer, cleaning consumables and curing equipment. The site's startup budget tool helps you lay it out without guessing at numbers.

Washing and curing are two different steps

Formlabs’ support page separates washing from post-curing for its SLA parts and recommends IPA or TPM for washing. It distinguishes some functional resins, requiring post-curing for optimal properties, from its standard resins. That general summary does not identify every formulation version. Before deciding for your bottle, find its instructions and equipment requirements: the summary does not set the protocol for a specific grade or third-party LCD resin.

Do not infer sanding or painting behavior from a part’s wash state: the two pages do not compare those outcomes for cured and uncured parts. The support page describes Formlabs resin categories only. For your bottle, record the exact reference and version, then consult the manufacturer’s washing, solvent and post-cure instructions; a general SLA statement does not validate another brand’s LCD resin.

For a verifiable decision, record the allowed solvent, washing and drying steps, and post-curing instructions for the exact reference, with the stated equipment conditions. If an instruction is missing, obtain the corresponding documentation before choosing the next workflow step. The resin post-processing guide presents the general sequence; grade and equipment instructions take precedence.

Supports, sanding, primer and paint

The Formlabs guide says SLA supports are fairly easy to remove depending on orientation, while FDM supports can take more work and leave marks that need sanding for a high-quality finish. This remains the guide’s comparison; it does not promise the result for a particular miniature. Review orientation and contact points in the model and slicer: the sources give no universal placement that prevents marks or breakage.

Before painting, the guide recommends removing supports, sanding their marks and applying primer; it says the amount of sanding depends on the desired finish. It describes SLA prints as smooth out of the printer and FDM as potentially needing extra sanding, within the scope of its guide. This is not a surface guarantee or certified finish level for every printer.

For hand painting, Formlabs presents acrylic as a versatile option and recommends checking that the selected paint lists plastic or multisurface use, then priming first. The page also describes spray paint, primer, a thick undercoat and a topcoat as appearance tips. They do not prove chemical compatibility with every resin or measured durability; follow the paint and resin manufacturers’ instructions.

Finding and preparing the miniature file

The Formlabs guide notes that a model may be downloaded, designed or scanned, and names Pinshape, MyMiniFactory, Cults and Thingiverse as examples of communities to look for miniatures. It does not verify their current popularity, licenses or rights for a particular file. Read the creator and listing terms before using a model; the free STL files page covers libraries but does not replace those terms.

For digital sculpting, the guide names ZBrush and describes its use in movies, games, and animation. It also discusses 3D scanning, which may need adaptation, optimization, and finalization before printing, and cites Meshmixer as a mesh-editing example. If you choose one of those workflows, check the available tool version and its functions for your file rather than inferring current availability from an example in the guide.

As a preparation check, inspect the model at the intended scale and preview its supports. Record fine features to check and areas where surface finishing would be acceptable in your project. The guide relates orientation to support removal and marks: compare options in the slicer, then retain the model, profile, and finishing choices so you can compare the resulting part with your expectations. These are proposed checks, without a measured print result on this page.

Sources and limits

• Formlabs — Miniatures and custom figurines guide
• Formlabs — Post-processing SLA and SLS parts

We organize manufacturer and community documentation; we have not measured these products ourselves. The manual for your exact model takes precedence over general guidance.