Library help: Tech Support

Support structures in 3D printing are essential for overhangs and bridges but often stick to the model walls. If not removed carefully, they can leave blemishes or even cause parts of the model to break off. In such cases, glue can be used for repair. 

FDM (Prusa MK4 & Bambu X1E)

Supports can be removed using:

• Fingers
• Needle-nose pliers
• Flush cutters
• Exacto knife

Always wear protective gloves when using tools, especially sharp knives and choose the most suitable tool based on the support type. For small, thin overhangs, use pliers or a knife to avoid damaging the model.

SLA (Formlabs 3+) 

For best results, use flush cutters to remove support touchpoints one at a time, starting from the outer edges to gradually loosen the support structure. Parts with fine details or thin sections may require extra care during removal to avoid damage. In most cases, removing supports directly at the touchpoints with flush cutters ensures the cleanest outcome.

To achieve a smooth surface finish and avoid divots, remove each support individually. Any small marks or raised areas left behind can be gently sanded for a clean final appearance.

Warning

Some methods of support removal may enable small pieces of supports to break away. Beware of flying debris and consider wearing eye protection and gloves to protect the skin and eyes. 

Tips for Delicate Prints

Take extra care when finishing delicate 3D prints to avoid damaging small features. Use fine tools like tweezers  or small files for precision work.

Support Removal Tips:

• Only break the base into sections if it won’t risk damaging the model, especially when handling multiple fragile parts.

• Be cautious: Breaking the base can cause supports to snap, potentially leaving cracks or divots.

• Snip individual supports and touchpoints carefully to access inner areas. Use flush cutters close to the surface to minimize sanding later.

• Avoid peeling supports by hand unless surface quality and fine details aren’t a concern.
   

Sanding Guide 

Sanding is an effective method for smoothing and finishing 3D prints. Here’s how to get the best results:

• Wet Sanding: Use high-grit sandpaper (220 to 1200) for wet sanding to remove support structures and polish the model.
• Procedure:
  • Apply water to the print and sand gently in smooth, light motions.
  • Start with a rough grit (e.g., 150) to remove larger imperfections.
  • Gradually progress to finer grits (120, 220, 400, 800, 1000, and 2000) to achieve a smooth, polished finish.

Be mindful that removing support touchpoints may leave small marks or divots. Sanding helps to eliminate these imperfections.

Safety Tips:
Wear gloves to protect your skin from resin dust.

Use wet sanding to minimize dust exposure and ensure safer handling of plastics.

Finishing with Oil

After sanding, your print may have a fine layer of dust. Here's how to clean and finish it:

• Dust Removal: Wipe the part with a microfiber cloth to remove cured resin dust.
• Apply Mineral Oil: Lightly apply a small amount of mineral oil to give the part a smooth finish.

Effect: Mineral oil adds a subtle, dull shine and a damp feel to the surface.
Tip: Use sparingly as too much oil can leave the part feeling oily.