I hear you. You’re tired, your eyes are gritty and your mouse finger hurts. You’ve been working too hard.

I hate that. I want to help you.

AutoCAD has been called the world’s biggest drawing board (It’s also been called the world’s biggest eraser!), but the real advantage of Computer Aided Design is the ability to copy and paste.

What could be quicker than copying and pasting a detail you already did right?

Design and Motion’s own Mike Thomas has written an excellent series on creating blocks with AutoCAD. You should read it now.

For those of you who are already creating AutoCAD blocks, you’ll know that there is a journey between creating AutoCAD blocks, and creating really good AutoCAD blocks.

I’ve put together these 14 tips and tricks to help you troubleshoot your AutoCAD block problems.

Do you have any tips to add? Share your experience with your fellow readers by leaving a comment at the end of this post.

AutoCAD Block Tips and Tricks

Reset block

Did your Parametric or Dynamic blocks go a little kooky when you added just that one more parameter/action set?

Right click on the block and chose ‘Reset Block’ to bring your block back to its starting position. If your actions are going to work they will work now.

AutoCAD Reset Block

Non-exploding blocks

Did you ever create a block only to realise later that you couldn’t explode it? You probably missed the Allow Exploding’ option in the block creation dialogue.

AutoCAD Block definition Allow Exploding

You can make your AutoCAD Block ‘Explodeable’ by:

  1. Right click and chose ‘Open in Block Editor’.
  2. Type PROPERTIES at the command line to open the properties palette.
  3. Scroll down the block’s properties until you get to the Allow Exploding’ value.
  4. Chose yes.
  5. Save and close the block.

AutoCAD Block properties Allow exploding

Note: It is a really, really bad idea to explode Parametric or Dynamic blocks. I’ve seen the Dynamic Parameter/Action sets that were inside the block go crazy on explosion and corrupt the DWG file.

This is what the explode option is designed to prevent! If you need to explode a dynamic block, edit the block definition and delete the Dynamic and/or Parametric actions first.

Check out this companion tip Block opens in Block manager


AutoCAD blocks with attributes and Fields are an awesome combination. Attributes allow you to add data to your AutoCAD blocks – Fields allow you to reference data from inside or outside your DWG file.

You can use Fields to reference the area enclosed by a polyline, the date the drawing was last plotted, or (my favourite) title block information from the Sheet Set Manager.

AutoCAD Block Attributes that contain Fields are indicated by a light grey background. Occasionally the field value doesn’t update as expected.

If your attributed Fields aren’t updating – type FEILDEVAL in at the command line to check this variables value.

The value codes will be a combination of the following:

0              Not updated
1              Updated on open
2              Updated on save
4              Updated on plot
8              Updated on use of ETRANSMIT
16            Updated on regeneration

Tip: The value of FEILDEVAL is a bitcode, so you add them up to choose multiple options e.g.

3 = Update on Open and Save
9 = Update on Open and ETRANSMIT
31 = Everything

Re-set insert point

After you’ve been creating and using blocks for a while, you’ll realise how important it is to set an Insert point when you define your block.

However, we all have off days – and it’s easy to forget this step.

Just redefining the blocks origin won’t do – this will move your blocks all over the place (don’t even mention blocks that have been rotated or mirrored).

Correcting the Insert point in an AutoCAD block

To rescue an AutoCAD block with an undefined Insert point I use the following steps:

  1. Right click on the block instance to open the block in the block editor.
  2. Draw a rectangle from 0,0 to the point that you would like to make the block’s origin.
  3. Move your block’s geometry (but not the rectangle) from the point that you would like to be the origin to 0,0. Close and save the block definition.
  4. Select all the block instances (you may need to do a few selection sets based on the orientation of your block instances) and move from the old insert point to the new one – one corner of the rectangle to the other.
  5. Edit the block again and delete the rectangle.
  6. The Block insert point is now defined correctly, and the block remains in the right place!


Occasionally you’ll need to edit the location of Attributes to make your blocks look super tidy and neat.

Sometimes the attribute’s position doesn’t update as you’d expect. BATTMAN (Block ATTribute MANager) can solve this problem.

To start the Block Attribute Manager, type BATTMAN at the command line:

(You don’t have to hum ‘ba du bA dU BA Du BA DU BAT MAAAAAN’ while you do this – but I do).

Click on the ‘Select Block’ button and click on your block instance to choose which block to sync.

Click on the SYNC button to sync up your block attributes and their new locations.

AutoCAD Battman Sync Attibutes

Draw order

Draw order is one of those weird things in AutoCAD that doesn’t always work as you expect.

DRAWORDER is really useful when building Wipeouts into your block definitions to mask AutoCAD geometry.

To change the order that geometry is drawn, right click and chose from:

  • Bring to Front
  • Send to Back
  • Bring Above Objects
  • Send under Objects

Unfortunately, draw order isn’t always maintained, and geometry can go back to the original draw order without provocation.

AutoCAD Draw order

The tip here is to right click and chose ‘Copy with Base point’, then delete your geometry and paste it back in again at the original position.

This seems to re-write the draw order, and the order that AutoCAD draws your entities will now be more reliable.

Redefine block with Design Center

This quick tip really helps when you want to update a block definition in one drawing from a block definition in another drawing.

AutoCAD Deisgn centre Redefine only

I use this frequently to add forgotten data to title blocks when using the sheet set manager.

  1. Open all the DWG files which contain your old block definition.
  2. Open the DWG file which contains the block you wish to use as your new definition.
  3. Type ‘ADCENTER’ at the command line to open the Design Center.
  4. Browse to the Blocks node and find your block new definition.
  5. Toggle to a drawing that uses the old block definition use CTRL+TAB.
  6. Right click over the new block definition in the Design Center and chose ‘Redefine only.
  7. Repeat steps 5 and 6 until all blocks have been redefined.


The RENAME command is a very simple way to rename your CAD blocks. I find it helpful to use the properties palette to find the old name of the block first.

Next type ‘RENAME’ at the command line. Select ‘Blocks’ to filter the RENAME dialogue to blocks. Enter the old name of the block, enter the new name of the block and choose OK.

Dead easy.

AutoCAD rename block command

Block opens in Block manager

If you get the message:

drawing contains authoring elements, open in block editor?

You probably have a DWG file which contains an exploded dynamic block.

Make sure that you used ‘INSERT’ and not ‘OPEN’ to access the DWG which contains the block definition.

Dynamic properties aren’t available on block insertion

If you insert a Dynamic block definition into your drawing and find that it has suddenly become ‘Dumb’ – you’ve probably accidently inserted the whole drawing that contains the Dynamic block definition.

You have a block within a block…

Just explode the block definition to reveal the Dynamic actions within.

If your block won’t explode – follow this tip Non-exploding blocks

My block inserts at a weird scale

As you probably know, AutoCAD is unit-less. One unit in AutoCAD could be 1mm, 1 Inch or 1 Parsec. It is completely down to the drafter to decide what the units will represent.

This can be a bit awkward if you try and insert a Block which was defined as one unit = one mm, into a drawing which has been defined as one unit = one Inch.

To get around this, Autodesk introduced the INSUNITS setting (INSert UNITS). You set this when you create your block definition.

AutoCAD Drawing units

Every AutoCAD Block has an INSUNITS value. Every AutoCAD DWG has a UNITS value – you can see what your units are set too in your drawing by typing ‘UNITS’ at the command line.

AutoCAD Block definition Units

This allows AutoCAD to compensate by comparing the units in the drawing, with the units in the block definition and setting the scale on insert accordingly.

If your block is automatically scaling itself in an unexpected way, check the UNITS value in your drawing and check the INSUNITS value in your block definition.

You can do this by right clicking on your block instance and choosing ‘Edit in Block Editor’, and then opening the properties palette by typing PROPERTIES at the command line.

My blocks disappear when I change viewport scale

This is a common problem that came in with AutoCAD’s Annotative scaling feature set.

If your block is defined as being Annotative it will automatically scale itself to suit the current paper space floating viewport scale.

AutoCAD Block definition Annotative option

Every annotative block contains a list of scales that it will react to.

If the current paper space viewport scale is not the same as one of the scales listed in the block – it will disappear from view in the floating viewport!

To add a view scale to a block definition:

  1. Add your standards scales to your DWG file
  2. Right click on the block instance and chose ‘Open in Block Editor’.
    Open the properties palette by typing PROPERTIES at the command line.
    Scroll down to ‘Block’ properties, under annotative – chose ‘yes’.
  3. Save the block and close the Block editor.
    Select the block again, in the properties palette, scroll down to Misc > Annotation Scale – and click on the button.
  4. In the Annotation Object Scale dialogue, chose ‘Add…’
  5. In the Add scales to object dialogue, pick from the scales that are already defined in your DWG file and choose ‘OK’ to add them to your block.

Back in the Annotation Object Scale dialogue, click OK to finish.

Add annotative scale to AutoCAD Blocks

To remove all Annotative behaviour from a Block definition:

  • Open the block in the block editor as above
  • Open the properties palette as above
  • Scroll down and find ‘Annotative’
  • Chose ‘NO’ from the drop down
  • Save the block and close the Block editor

The action bars in the Block editor aren’t behaving

If the action bars in the block editor are all over the place, type ‘BACTIONBAR’ at the command line and chose the ‘RESET’ option.

Block editor won’t work

If you can’t open the block editor, you’ll want to know this!

To access the AutoCAD Block editor, you’ll need to make sure that the system variable ‘BLOCKEDITLOCK’ is set to 0.

In conclusion

Experience is what you get when things go wrong! I’ve created A LOT of AutoCAD blocks, and gained a lot of experience along the way 😉

I hope that you found something in this post that helped you to enjoy creating your CAD Blocks.

Do you have a tip or trick that you’d like to share? Leave it in the comments below.

Don’t forget to visit Mike’s AutoCAD block deep dive series for more on creating re-usable content for AutoCAD.

Thanks for your time.

Paul Munford

Paul MunfordPaul Munford is a self confessed CAD Geek who writes Tips, tricks and tutorials for D&M, AUGI and his blog Cadsetterout.com. Paul is currently in the throes of Writing a new eBook – click here to find out more about ‘101 AutoCAD Tips’.