alt Hacker News you accidentally knock a hole in your wall,
it’s probably cheaper to buy a flatscreen TV
and stick it in front of the hole
What does the HN panel say? Is it a solution? Or does it have any downside?
Replies
Welll, if you were good at drywall already, drywall patches would be faster and better. But if you are good at printing and scanning, and you enjoy that process, then it’s fine.
The challenge with the example is that “success” is personal preference. With plenty of examples, the success criteria are external.
It's fine.
The biggest actual problem would be in a fire, the PLA will burn and let the fire into the wall cavity, where drywall would maintain a barrier for much longer - that is why we have drywall in the first place, it is a decent fire barrier.
It's an acceptable solution only if you used it as an excuse to buy a 3D scanner.
I would simply do the normal thing of covering the hole with drywall patch screen, covering that over with drywall joint compound, letting it dry, sanding, and painting. This is an under $50 trip to Lowes, and certainly cheaper than a flatscreen TV.
Cosmetically it's probably fine. The downsides all have to do with predictability and the ability to reason about what the wall is made of in the future.
A person who goes to eg hang a picture frame or shelf there will encounter a different material with different load bearing properties than expected. Pushing into the center of that area with EG a drill bit will not have the same physical response or give, and depending on how it was braced/integrated with the surrounding wall, the patch itself may be pushed or pulled out of place. Similar for anyone that leans on that area if it's at such a height.
The solution I was taught as a child is to saw the hole square, put a section of 2×4 behind it spanning the hole, held in place with a drywall screw through the drywall on each side of the hole, cut a square chunk of drywall small enough to fit in the hole, put a drywall screw through the middle of it into the 2×4, and tape, mud, sand, and paint.
I suspect that this procedure is faster and easier than taking a 3-D scan of the hole, 3-D printing a PLA patch, and gluing it in, but it does require most of an hour and the appropriate materials on hand.
It's a solution. There are better solutions, and far worse solutions (anyone who has worked to get a deposit back on a college rental has probably developed a few of their own), and most of them are all still fine because drywall isn't (shouldn't be) structural.
Crucially, even if you are completely unwilling to take a stab at a fix yourself, hiring a local handyman to patch a hole via some good enough technique should still be far cheaper in most places than buying a nice new TV.
But nothing is gonna ever beat buying a 2nd-hand framed picture or plaque or movie poster or grabbing a flyer from the junkmail on your porch and tacking it over the hole... And if you're determined to fix holes with a TV, you can probably find one used for about as cheap / free as any of the other choices. Which is what makes this such a stupid example - the cost of TVs, like framed images or furniture, spans from $0 to "as much as you're willing to pay". Hiring someone can also be arbitrarily expensive, but can by definition never be 0. So the comparison is rhetorical trickery and demonstrates nothing.
...other than, apparently, Andreessen's dissatisfaction with paying tradespeople.
It works so :shrug: I did the same to replace a part of a door frame I had to remove to make space for a washing machine 4 mm too wide. Nobody sell 400 mm of door frame so i just copied the frame shape, printed in 3 parts, and that was it. Filament color matched the frame one so I didn't have to paint.
I commend you for your imagination. Can I ask how you crafted the object to match the dimensions? I’m brand new to 3D printing and currently climbing the learning curve of printing itself but will want to start learning about doing my own modeling soon.
The only criticism I’d make is that patching drywall is dead simple and cheap and so your solution seems possibly a bit overengineered (and, while I’m at it, that Andreesen’s observation is both facile and meaningless and is probably a reflection more of the bids Marc Andreesen’s house manager gets than anything insightful about labor costs in America).