Modelling technique - finishing 3d printed parts

Skyler101

Sr Member
Hi guys...

Wanted to see if anyone has found a quick and easy way to smooth out 3d printed parts.

Last week I saw a model of Obi-Wan's original Ep4 saber hosted on Thingaverse, and thought I would give it a go :)
Some of the parts came out flawlessly (grenade, pommel) others needed work. One thing I did notice was that the method of making the parts on a filament printer meant that there is the "ringbarking effect" around the pieces.

Has anone been successful in finding a way to smooth out this effect? I was thinking about filing the surface, and gently sanding it back, then my next thought way, which putty, how long, ext...

I'm sure if we put our heads together, we could come up with a quick and cheap method of finishing the surface. The RPF always teaches me new things I never though of! :)

I print in PLA, so before anyone says "Vapor bath" I don't think thats an option at this point!

Love any ideas, tricks, or suggestions you might have.... I'll post pics as I try the different methods! :)

-Skyler101
 
Here's my method:

1.Sand part with 220grit (using foam sanding pads)

2. Primer part (two options)
a. spray with a catalyzed primer (auto body supply store)
b. two coats of rattle can sandable primer

3. Wet sand with 320 grit

4. Gaps or Defects use evercoat glazing compound or 3M spot putty

5. Primer again and Wet sand with 400 grit.

You should never have to use a heavy filler like bondo on a 3d printed part.

Motor Guard Sanding pads:
idqq.jpg

hy9y.jpg

Cut down to size as needed.
 
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Ahhh.. Make magazine. I wish I could get them!
Can you point a link to the article?

Anyone else have any ideas, tips?

-Skyler101
 
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Catalyzed Primer with an HVLP spray gun is your friend.



Another Trick is the orientation of the part during building.

A curved surface will print better in one orientation versus another.

I've been finishing 3D printed parts since 2000.



Not a makerbot rookie... and 3d printing is not new.
 
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