What Type of Primer Should You Use for 3D Printed Figures
Creating stunning 3D printed figures isn’t just about the printing process; it’s also about the finish. If you’re aiming for professional-looking results, the real transformation begins after your model leaves the printer. That’s where primer plays a pivotal role. Using the right 3D print primer helps smooth layer lines, improves paint adhesion, and takes your model from raw plastic to a polished masterpiece. The challenge lies in choosing the right one. With so many options, it’s easy to get bogged down. But don’t worry; we’re about to break it down in simple terms.
Priming may feel like an optional step, but it’s often the key ingredient that transforms an average model into something truly impressive. Let’s explore what works best and how to use it like a pro.
Why Priming Matters More Than You Think
Priming isn’t just for show. It hides surface imperfections, provides paint with a surface to adhere to, and smooths out inconsistent textures. When dealing with FDM or resin prints, these imperfections can significantly impact the overall look.
Choosing the best primer for 3D prints ensures you get cleaner lines, smoother surfaces, and a flawless base coat, ready for whatever colour or weathering effect you throw at it. Without it, paint chips easily, highlights become uneven, and layer lines stand out like a sore thumb. Let’s not waste all that effort on the design and print stage by skipping this crucial step.
Types of Primer for 3D Printed Figures
Spray Primers: Fast, Clean and Reliable
Spray primers are ideal for both beginners and professionals. They’re easy to apply, dry quickly, and reach tricky areas that are hard to paint with a brush. Many brands even offer versions labelled as the best filler primer for 3D prints; explicitly designed to fill tiny gaps and layer ridges.
Sprays offer thin, even coverage, making them ideal for models with intricate details, such as miniature figures or cosplay components. For best results, apply light coats and let each one dry before adding the next. This method preserves details while giving your figure a smooth finish that’s ideal for painting.
Brush-On Primers: More Control, Less Mess
Brush-on options are ideal when you require extra control or are working in confined spaces. They allow targeted application; perfect for touch-ups or models with fragile elements. They also tend to be thicker, which is helpful if your print has visible layer lines or minor flaws.
Some artists use both: a spray coat for general coverage and a brush-on primer for problem spots. This hybrid approach combines speed with precision.
Automotive-Grade Fillers: For Large, Flat Surfaces
Need to prep a helmet or a prop with broad, flat areas? Automotive filler primers are the heavy lifters of the primer world. These are especially useful for FDM prints, which often have more pronounced ridges.
These high-build formulas are often regarded as the best filler primers for 3D prints, particularly for large-scale pieces. They stand well and offer an ultra-smooth surface, but be aware that they can obscure small details if overused.
Choosing the Right Primer Based on Material
PLA and PETG Prints
PLA and PETG are common filament types used in home printing. While they work well with most primers, lightly sanding the surface before priming yields better results. If you’re printing figurines, go for a fine 3D print primer that won’t flood tiny details.
Resin Prints
Resin prints are generally smoother out of the vat but can still benefit from a coat of primer, especially when painting with metallic or transparent effects. A thin spray primer is usually more than enough in this case.
ABS and Nylon
These materials are more challenging because they can repel paint if not properly prepared. Ensure the primer for 3D prints you choose is compatible with the plastics or flexible surfaces you intend to use.
Expert Tips for Flawless Application
Clean Your Prints First
Before anything else, clean your model. Dust, oils, or bits of support material will ruin your finish. A gentle brush along with warm, soapy water typically does the job effectively. For resin prints, a quick rinse in isopropyl alcohol is essential.
Sand Strategically
You don’t always need to sand, but if you do, use fine-grit sandpaper; grits of 400 to 800 work well. Focus on the areas where you notice ridges or bumps. A well-sanded surface helps your 3D print primer grip better.
Apply in Thin Layers
Less is more. Two or three light coats are better than one thick one. Thick coats can drip, pool, and bury detail. Make sure to allow each coat to dry completely before applying the next one.
Don’t Skip the Test Piece
If you’re unsure, test the primer on a scrap bit of the same material. This helps you spot any issues early, like cracking or poor adhesion.
Common Mistakes to Avoid
- Skipping primer can lead to poor paint adhesion and make surface flaws more visible.
- Using too much primer might cover fine details and create an uneven texture.
- Applying primer in high humidity or low temperatures can ruin the finish and cause cracking or peeling.
Applying the best primer for 3D prints takes a bit of patience, but the payoff is worth it. A well-primed model is the foundation for a striking final piece.
If you’re working on more complex builds or large-scale models, CAD Deziners offers a professional 3D printing service in Sydney and beyond to help you get everything just right, from base material to post-processing.
Summary: Let Primer Do the Heavy Lifting
The right primer sets the stage for success. Spray primers are quick and ideal for detail work. Brush-ons offer flexibility and control. And automotive fillers are your best mate for smoothing big surfaces. Whichever you choose, the goal is the same: a smooth, paint-ready model.
Taking time to prime your 3D prints gives them durability, polish, and a professional look that stands out. The key lies in understanding your material, your project goals, and the finishing touches that bring your models to life.
Want your next 3D print to look like it belongs in a gallery? Let our experts in 3D printing in Brisbane and other Australian regions help you prime for perfection.
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