Your STL file 3D model may come out messy in resin due to STL file errors (non-manifold edges, holes), incorrect printer settings (exposure time, layer height), or poor resin conditions (contamination, viscosity).
Non-manifold geometry—where faces don’t connect properly—confuses the printer, causing uneven or loose parts.
Too short exposure leads to under-cured layers; too long makes parts brittle. Wrong layer height can also create mess.
Contaminated resin (dust, old material) or a clogged tank disrupts curing, resulting in inconsistent layers.
Fix it by using tools like Meshmixer to repair STL errors. Follow the resin manufacturer’s settings—adjust exposure by +1-2s if under-cured.