> Just think of how many 3d prints you've seen that consist of multiple parts friction for together.
I've seen probably 10s, ranging from amateur-who-just-unpacked-their-printer to acquaintance who runs a business doing 3D printed products, and none of them come close to the experience of lego bricks, so far I'm not sure I'd actually call it "work". Stack 10 of these "custom" lego bricks and place them next to another stack of 10, and they almost certainly won't be as aligned as proper lego bricks, not to mention the whole thing will fall apart a lot easier.
Also: try taking them apart a hundred times and sticking them together again. If the parts initially stuck together strongly, chances are one of the parts will break down.
I've seen probably 10s, ranging from amateur-who-just-unpacked-their-printer to acquaintance who runs a business doing 3D printed products, and none of them come close to the experience of lego bricks, so far I'm not sure I'd actually call it "work". Stack 10 of these "custom" lego bricks and place them next to another stack of 10, and they almost certainly won't be as aligned as proper lego bricks, not to mention the whole thing will fall apart a lot easier.