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Makerspace, Resin 3D Printing Basics

Resin 3D printing produces highly detailed parts ideal for miniatures, jewelry, prototypes, and dental models. While more complex and messy than filament printing, the quality is unmatched. This guide introduces resin printing basics for beginners.

Step 1: How Resin Printing Works

Resin printers use light to cure liquid resin layer-by-layer. Common technologies include:

  • SLA: Uses a laser to draw each layer (more precise, more expensive)
  • MSLA: Uses an LCD screen and UV light to expose a full layer at once (faster, more common)

Step 2: What You Need

  • Resin printer: Popular models include Anycubic Photon Mono, Elegoo Mars
  • UV resin: Choose standard, ABS-like, or flexible types
  • Isopropyl alcohol (90%+): For cleaning prints
  • Curing station or UV light: To fully harden the resin
  • Gloves, mask, and ventilation: Resin can be toxic and smelly

Step 3: Preparing the Model

  1. Download or design a model (.STL or .OBJ)
  2. Import into resin slicer (e.g., Lychee, ChiTuBox)
  3. Add supports and hollow the model if needed
  4. Slice and save the .photon/.cbddlp file to USB

Step 4: Printing

  • Pour resin into the vat — don’t overfill
  • Start the print and monitor the first layers
  • Keep the room ventilated and away from sunlight

Step 5: Post-Processing

  1. Remove the print with a scraper
  2. Wash in isopropyl alcohol to remove uncured resin (use ultrasonic cleaner or rinse tank)
  3. Remove supports carefully with flush cutters
  4. Cure under UV light (2–10 mins depending on size)

Step 6: Cleaning and Safety

  • Wear gloves and eye protection when handling resin
  • Clean resin vat after prints, and avoid skin contact
  • Dispose of waste properly — cured resin can go in trash, but liquid must follow hazardous waste guidelines

Step 7: Common Mistakes

  • Layer separation: Build plate not leveled or exposure time too low
  • Print won’t stick: Clean and level the build plate; increase bottom layer exposure
  • Resin too cold: Keep it between 20–25°C for best results

Next Steps

Resin printing requires more care, but the results are worth it. Once you're comfortable with the process, try advanced techniques like castable resin, flexible parts, and custom support tuning!