3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: !functionalprint@kbin.social or !functionalprint@fedia.io
There are CAD communities available at: !cad@lemmy.world or !freecad@lemmy.ml
Rules
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No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
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Be respectful, especially when disagreeing. Everyone should feel welcome here.
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No porn (NSFW prints are acceptable but must be marked NSFW)
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No Ads / Spamming / Guerrilla Marketing
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Do not create links to reddit
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If you see an issue please flag it
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No guns
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No injury gore posts
If you need an easy way to host pictures, https://catbox.moe may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is 
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It all really depends on what you are doing and the conditions of the part.
I'm a former auto body shop owner and painter. This kind of thing is what I did all the time, but many techniques are tricky to do in practice.
The flexibility of the material around the repair is important. Like body fillers (bondo) are formulated to have similar properties to steel. There are specific varieties made for different plastics.
If all you need is a temporary fix for tomorrow or a few days from now, masking tape, papier-mâché, etc. You might be able to print a very thin overlay that you can glue over the spot.
In my experience, it sucks, but you'll likely be better off accepting your mistake now and starting over properly. You would not believe some of the losses I've had to take when painting cars because I tried to fix mistakes like this, and even ones I had to start over. Like imagine painting an entire car, completing the job, but deciding you want to do one more clear layer over the hood where there is a slightly dry spot and your spray gun decides it hates you, a seal fails, and a bunch of fluid drips onto the surface ruining the whole job. I've had stuff like that happen a ridiculous number of times.
In auto body work, sanding through too much of a surface is very common. You can't just spray a tiny bit over that surface or ignore it and get away with the issue. It is a big deal. Your problem may not be of this magnitude. It may be fixable, but beware of placing bandaids on bullet holes expecting a full recovery. My rule was to step away and take a break before assessing the situation. Emotional investment clouds one's best judgement. GL.