This is my new guide to merge objects on sandbox. There has not been a guide (that I know of) that shows you how to do this. Here we go.
Step one.
Place your object where you wish. I am using this block for example.
Step two.
Secure one of the sides with teleporters, or something else. Make sure you only do one set of parallel sides. You'll see how to determine which sides in the other steps.
Step three.
Put objects that go half as high as the object against the two remaining walls. Then put some small objects, such as wedges up against the block. Leave as much room as you want, depending on how much you want the block to go into the ground. Make sure it is all snug, those pieces act as "holders" aswell.
Step four.
Set the object to a long spawn time, and to not spawn at start.
After that, start a new round.
Step five.
As you can see, I put some recievers on the end of the block, just to be safe. Now, do something similar to the picture bellow. Those walls will act as the door, like on foundry.
Step six.
You can either wait for the object to spawn, or go into its settings and make it spawn by changing its runtime minimum, to the maximum. Then change it back after it appears. Go to the object and grab it. Drop it right away. Don't hold on, just grab and drop. You should be able to see it sink into the ground. Wait, to make sure it's secure before removing all other items.
There you have it. Merging on Sandbox. This probably won't be used to often, but I think it is the easiest, if not only way. Tell me what you think!
Note: This may work on some pre-dlc maps, not sure. If someone could test it and reply, that would be great. Thanks.