Can't explode a block?

Have you ever come across a block that you could not explode? You might try and get this message:

Command: explode
Select objects: 1 found
Select objects:
1 could not be exploded.
Command:

The ability to restrict blocks from being exploded was added many releases ago, but I still see a lot of users confused by this. Here is how to "fix it".

What you need to do is redefine the block and allow it to be exploded.

  • Run the BLOCK command and select the desired block from the list.
  • Now check the box that says "Allow exploding", then click OK.
  • If there are instances of this block inserted in the drawing, you may get the dialog shown here asking you to confirm your decision to redefine the block:
  • If there are no instances of the block inserted in the drawing, then you may get this similar confirmation dialog:
  • Either way, confirm that you want to redefine the block.
  • Now you will be able to explode an insertion of this block definition.

There is another (fairly rare) reason you might not be able to explode a block, and that is if it was inserted using MINSERT. If that is the case, the command line will tell you when you try to explode

Command:  EXPLODE
Select objects: 1 found
1 was minserted.
Select objects:
None found.
Command:

In this case, you will have to erase the MINSERT and reinsert the block(s) and explode the blocks as needed, or Autodesk has an alternative method listed here on their KB.