There is a block definition on layer X, delete it before deleting layer

[eobet]

So how do you currently delete a single nested block definition? Is it possible at all?

Apparently I again got one left over on a layer I moved objects away from, and I suspect there’s like 3-5 levels of nesting, but I can’t be sure since I have no way (that I know of) of viewing that in Rhino.

And yes, this isn’t new… first couple of hits on Google… oldest thread is from 2010 apparently…

"Batch Delete" for All Block Definitions in Block Manager?

Is there any way to delete all the block definitions in the Block Manager with one wave of the wand? The only method that seems possible is to RMB on each one—one at a time—then delete the definition. (Good fun when working on a Solidworks file with hundreds of block definitions, including all the screws and bolts!) Related Wish: it would be pretty neat if Rhino could detect if a block is exploded, and no longer in use; Rhino would automatically delete that block in the Block Manager. ~Dave

Phantom blocks and layers that can't be deleted

I am sorry, but it’s a design flaw to marry a block definition to any layer–because it doesn’t have to be on any. After dealing with this, I now create ALL of my definitions on the “default” layer. From there, I put the instances on which layer I want. It’s a poor compromise, but it’s better than searching for definitions. [This is one of the only 3 things I dislike about Rhino, the others being the texture replacements didn’t work in blocks, and the block manager is quite paltry for counting …

Deleting layers, problem with block

I often have confusion with layers and blocks, I just got the problem once again so I decided to ask for help: chronologically: I have a layer with blocks I select the objects in that layer called layer0 and change layer to the new destination layer called “box” then, I check: it worked because the origin layer0 is empty (I use select object: “no object in this layer”) I try then to delete this layer but I get: “there is a block definition named Component3 in layer0…check block ´manager” so …

Can't delete reference layer

Hi, I use a fair amount of nested blocks but have only recently started using linked only blocks, i.e. linked and not embedded. I would prefer to use reference style layers for non-embedded blocks but have hit a problem - I can’t delete an unwanted layer even if I no longer use the block. For example, I complete a drawing with a couple of linked blocks, layer style ‘reference’. I then duplicate the drawing as a new file because I want to create a different version with different parts. In the…

http://v5.rhino3d.com/forum/topics/unable-to-delete-not-linked-block-definition-containing-nested
https://www.mecsoft.com/phpbb/viewtopic.php?t=2129

Is nuking the entire thing using the custom script from @pascal in the first link the only option?

EDIT: Also, how do you move a block instance to a different layer? Selecting the instance and then a different layer, and right-clicking to choose “change object layer” does nothing for me.

EDIT 2: Oh, my dear god!! The block instances are now occupying TWO LAYERS AT THE SAME TIME, and neither layer can be deleted! What is going on? How is this in any way usable?

EDIT 3: Holy shit, just when I thought it couldn’t get any weirder… I now have some objects which will ONLY APPEAR if two specific layers are visible at the same time! Enable either one separately, and it’s as if the objects don’t exist. Why is this even allowed??