DLP 3D printing: curing resin with a projector

How DLP works

The vat is filled with light-sensitive resin. A projector, in principle similar to one used for presentations, lights up a whole layer at once and the resin hardens. The plate then moves and the next layer follows. It is a method related to SLA, which draws point by point with a laser. So DLP differs mainly in how the light reaches the resin. That is why print speed does not depend on how complex a layer is.

Strengths and weaknesses

• Fine detail. Thin walls, small lettering and a smooth surface come out much better than with FDM.
• Speed. A whole layer cures at once, so layers go quickly.
• Brittleness. Standard resins are hard but brittle, and they change colour over time, especially in sunlight.
• Post-processing. Parts have to be washed in alcohol and post-cured with light, and the resin is an irritant.
• Small volume. The build area is usually smaller.

What this means for your order

We do not print DLP or any other resin process. We print with FDM in PLA and PETG. If you need something else, write to jakub.novak@boostello.com. We do not promise a print in advance, but we can advise.

For figurines with extreme detail or jewellery models, resin is the better choice. For holders, cases, spare parts and anything that has to last, PETG from FDM is often more practical, because it is tougher.

What to notice when comparing with FDM

A resin part is smooth, but it cracks under a sharp knock or when bent. An FDM part in PETG is more likely to flex than to snap. Resin parts also have to be washed and post-cured after printing, while an FDM part is finished as soon as it comes off the printer. For prototypes under mechanical load and for larger parts, FDM is therefore usually the more practical and cheaper choice.