Sanding and smoothing in 3D Printing - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of sanding a 3D printed object?

Sanding removes rough surfaces and layer lines to make the 3D printed object smooth and ready for finishing.

beginner

Which grit of sandpaper is best to start with when smoothing a rough 3D print?

Start with a coarse grit sandpaper, usually around 100-200 grit, to remove larger imperfections.

intermediate

Why is it important to use progressively finer sandpaper grits during sanding?

Using finer grits gradually smooths the surface without leaving deep scratches, resulting in a polished finish.

intermediate

What is smoothing in 3D printing and how does it differ from sanding?

Smoothing often involves chemical or heat treatments to melt or soften the surface for a glossy finish, unlike sanding which is a mechanical process.

intermediate

Name one common chemical used for smoothing ABS 3D prints.

Acetone vapor is commonly used to smooth ABS prints by slightly melting the surface.

What is the first step in sanding a 3D printed object?

A Use coarse grit sandpaper to remove rough areas

B Apply paint directly

C Use fine grit sandpaper immediately

D Heat the object to melt the surface

Starting with coarse grit sandpaper helps remove large imperfections before finer sanding.

Which material is commonly smoothed using acetone vapor?

A PLA

B ABS

C PETG

D Nylon

Acetone vapor smooths ABS by melting its surface slightly.

Why should you use progressively finer sandpaper grits?

A To save time

B To make the surface rougher

C To avoid deep scratches and get a smooth finish

D To change the color of the print

Finer grits remove scratches left by coarser grits, resulting in a smooth surface.

What is the main difference between sanding and smoothing?

A Sanding uses chemicals, smoothing uses tools

B They are the same process

C Sanding changes color, smoothing does not

D Sanding is mechanical, smoothing can be chemical or heat-based

Sanding is done by physically rubbing the surface; smoothing often uses chemicals or heat.

Which grit sandpaper is best for finishing touches on a 3D print?

A 400 grit or higher

B 200 grit

C 100 grit

D 50 grit

Higher grit sandpapers like 400 or more are used for fine finishing.

Explain the process and benefits of sanding a 3D printed object.

Think about how sanding changes the surface step by step.

Describe how chemical smoothing works and when it is used in 3D printing.

Consider the difference between mechanical and chemical surface finishing.