Supporting > Additive Machining

Distortion in a 3D print

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A7er:
The picture shows two resin 3D printed interior panels for my one tenth scale model of my Austin 7. I am making four models, so I printed four pairs, four right and four left panels. They all came out of the printer with the distortion shown on the end of the left hand panel. The right hand panel is after treatment. I used a hair dryer set on low to warm the panel before clamping it to a flat board. I let the panel sit for half an hour before taking it off the flat board. So far they seem to be staying straight, but if there is still a bit of distortion after I take them off the board and I reheat the panel, the distortion returns and I have to do the treatment again. The kink in the far end is where the panel follows the shape of the body and is supposed to be there.
I forgot to include a coin for scale. The panels are 1mm thick by 37mm high. The panels are shown the right way up, but they were the other way up on the build plate with dozens of supports.

Dave Otto:
It would have been interesting to see what it looked like before you removed it from the platform. I'm not clear how you built it or what the supports looked like.
What I do quite often at work is to build some support geometry to support the part during the build. I made a quick model to hopefully what I'm talking about. The gray part is the supporting structure and the blue is the part. The attachment points are very small and easily break away.

Just some food for thought.
Dave

A7er:
I did wonder afterwards if I should have printed each pair about 5mm apart with supports between them, as you have done.

The bottom edge is 1mm wide by 130mm long. The panel has a kink towards the front. I set the support to 100% in Prusa and added as many again by hand.

Still learning!

Dave Otto:
So the supports were only along the bottom edge!

A7er:
Yes. The panels were printed vertically, on the bottom edge. There's not enough room on my build plate to lay them down, and I couldn't foresee any problems. I now wonder if the pressure on the panels as they dipped into the resin tank onto the fep caused the distortion? I might try printing a pair 5mm apart with supports between them to see if it improves things, especially if the existing panels prove to be unstable. I don't want them pinging off the model at a later date.

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