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Applying a rubber-like coating to 3D printed PETG rollers is possible, but there are important considerations due to PETG's properties and limited adhesion with some materials. Here are the two main approaches and their limitations:

1. Plasti Dip:

Pros: readily available, inexpensive.
Cons: limited adhesion to PETG, might peel or lift, primarily offers a rubbery feel and color, not significantly waterproof or strengthening.

Preparation:

Lightly sand the PETG rollers for better adhesion.
Clean thoroughly with rubbing alcohol or soapy water.
Mask areas you don't want coated.

Application:

https://www.youtube.com/watch?v=PNDnV4qxK_U
Work in a well-ventilated area, wear gloves and mask.
Apply thin, even coats from 8-12 inches away.
Wait 30 minutes between coats, longer in humid conditions.
Apply 3-5 thin coats for better coverage and durability.
Let the final coat dry completely for at least 4 hours.

Tips:

Test on a scrap piece first.
Apply light, controlled bursts to avoid drips.
Use heat gun on low settings to speed up drying (be careful not to overheat PETG).
Consider Plasti Dip for plastics for potentially better adhesion.

2. Specialized Rubber Coatings:

Pros: better adhesion, potentially waterproof and strengthening properties.
Cons: generally more expensive and require specific application techniques.

Types of coatings:

Two-part urethane rubbers: Offer high durability and flexibility, require mixing and careful application.
Liquid rubbers: Brush-on or sprayable, require good surface preparation and specific curing processes.
Rubber sheets with adhesives: Can be cut and adhered to the rollers, requires finding compatible adhesive for PETG.

Important notes:

Always research and choose a coating specifically designed for PETG or plastics to ensure compatibility and adhesion.
Follow the manufacturer's instructions for specific application processes and safety precautions.
Test on a scrap piece first to assess adhesion and performance before applying to your actual rollers.

Alternatives:

Smoothing techniques: Sanding or vapor smoothing can improve aesthetics and potentially reduce noise from uneven surfaces.
Epoxy coatings: Offer durability and waterproofing without rubber-like properties.

Remember, applying a rubber-like coating might not always be the best solution for noise reduction or performance improvement. Consider alternative approaches and thoroughly research options before proceeding to ensure best results and avoid damage to your PETG rollers.

lease give ideas as to ways to quiet concave rollers 3d printed from PETG

Here are some ideas to quiet concave rollers 3D printed from PETG:

Reduce vibration at the source:

Print with higher infill: More infill reduces hollowness and vibrations. Experiment with different infill percentages to find a balance between strength, weight, and noise reduction.
Optimize roller design: Consider redesigning the rollers to have thicker walls, rounded edges, or internal ribs to add rigidity and dampen vibrations.
Balance the rollers: Ensure the rollers are well-balanced to avoid uneven rotation and wobbling.

Dampen the rollers:

Wrap the rollers with sound-absorbing material: Thin layers of foam, tape, or fabric can absorb vibrations. Experiment with different materials and thicknesses to find the best balance between noise reduction and performance.
Use internal dampeners: Print small, flexible inserts within the roller design to absorb shock and vibrations.
Lubricate the contact surfaces: Apply a thin layer of low-viscosity lubricant to the areas where the rollers contact other parts. Choose a lubricant suitable for PETG and the contacting material.

Reduce friction:

Polish the rollers: A smooth surface reduces friction and noise. Sand lightly with fine-grit sandpaper or use vapor smoothing techniques.
Use bearings: If possible, incorporate bearings into the roller design to minimize friction and wear. Choose bearings appropriate for the load and speed of the application.

External solutions:

Isolate the rollers: If possible, enclose the rollers in a sound-dampening chamber or box. Line the enclosure with sound-absorbing materials like foam or rubber.
Reduce motor noise: If the noise comes partly from the motor, consider quieter motor options or vibration mounts to isolate the motor from the frame.

Additional tips:

Identify the dominant source of noise by isolating individual components.
Address the easiest and most effective solutions first.
Test and iterate: Make small changes, test the noise reduction, and refine your approach.
Consider consulting communities and forums specific to 3D printing and your application for more specific advice.

Remember, the most effective solution will depend on the specific design of your rollers, the application, and the noise level you want to achieve.

While Plasti Dip can technically be applied to 3D printed PETG, it's important to understand some important caveats before proceeding:

Limited adhesion: Plasti Dip may not adhere perfectly to PETG due to its chemical properties. There's a chance it could peel or lift, especially on high-stress areas or with repeated use.

Limited functionality: Plasti Dip primarily adds a rubbery coating and color, but it doesn't have significant waterproofing or strengthening properties for PETG.

Alternatives: There might be better options for finishing your PETG print depending on your desired outcome. Smoothing techniques like sanding or vapor smoothing might improve aesthetics, while epoxy coatings could offer better durability and waterproofing.

If you still want to try Plasti Dip, here's a general guide:

Preparation:

Sand the PETG print lightly: Increase surface roughness for better adhesion. Use fine grit sandpaper (320 or higher) and avoid deep scratches.
Clean the print thoroughly: Remove dust, oils, and fingerprints with rubbing alcohol or warm soapy water. Let it dry completely.
Mask any areas you don't want coated.

Application:

Work in a well-ventilated area. Wear gloves and a mask to avoid inhaling fumes.
Shake the Plasti Dip can well.
Apply thin, even coats from about 8-12 inches away.
Wait at least 30 minutes between coats (longer in humid conditions).
Apply multiple thin coats for better coverage and durability (3-5 coats recommended).
Let the final coat dry completely for at least 4 hours before handling.

Additional tips:

Test on a scrap piece of PETG first to see how well it adheres.
Apply Plasti Dip in light, controlled bursts to avoid drips and runs.
Use a heat gun on low settings to speed up drying time between coats (be careful not to overheat the PETG).
Consider using Plasti Dip specifically designed for plastics, which might offer better adhesion.

Remember: Using Plasti Dip on PETG might not be the most successful approach, and there could be better solutions depending on your specific needs. Consider researching alternatives and conducting small tests before applying Plasti Dip to your entire project.