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What A Slime Block Doesn’t Stick To

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exsilit avatar exsilit
Level 66 : High Grandmaster Caveman

Here’s a list of all blocks that don’t stick to slime blocks (click to reveal block ID)

1. Anvil
2. Beacon
3. Bed
4. Bedrock
5. Brewing Stand
6. Chests (3 types)
7. Command Blocks (3 types)
8. Daylight Sensor
9. Dispenser
10. Dropper
11. Enchanting Table
12. End Portal
13. Furnace
14. Heads (6 types)
Skeleton Skull: minecraft:skull 0
Wither Skeleton Skull: minecraft:skull 1
Zombie Head: minecraft:skull 2
Player Head; minecraft:skull 3
Creeper Head: minecraft:skull 4
Dragon Head: minecraft:skull 5

To find out how to specify a player head’s owner visit www.minecraft-heads.com/uuid-heads-generator
15. Hopper
16. Jack o’Lantern
17. Jukebox
18. Leaves (6 tree types)
Oak Leaves: minecraft:leaves 0
Spruce Leaves: minecraft:leaves 1
Birch Leaves: minecraft:leaves 2
Jungle Leaves: minecraft:leaves 3
Acacia Leaves: minecraft:leaves2 0
Dark Oak Leaves: minecraft:leaves2 1
19. Melon
20. Note Block
21. Obsidian
22. Pumpkin
23. Shulker Box (16 colors)

Note that shulkers themselves aren't blocks but entities.
24. Spawner

To find out how to configure a mob spawner visit mcstacker.bimbimma.com
25. Structure Block

My test was conducted in version 1.11.2.
You can place any of these blocks right where you are standing using this command: /setblock ~ ~ ~ ID
To place a dispenser for example you’d type this: /setblock ~ ~ ~ minecraft:dispenser

My tips
Which block you might use next to a slime block will probably be different according to what you have and what you need. But for example, obsidian, pumpkins, and melons are solid blocks on which you can place redstone or carry a signal through. The Jack O'Lantern is even more amazing as it's also a light source.

But keep in mind that melons, pumpkins and Jack o’Lanterns (as well as leaves and heads) are the blocks on this list that will get destroyed if they are in front of a moving slime block.

Droppers, dispensers, furnaces and hoppers as well as chests have inventories and can be used in a redstone contraption or as storage without conflicting with a moving slime block.
Other blocks’ special behavior
Slabs and trapdoors don’t have to be visibly connected, just in the block space next to the slime block.

Sand and gravel will primarily react to gravity. If they get moved by a slime block and float afterward, they will fall.

A cactus will due to its normal behavior drop as soon as a slime block is next to it.

Signs and banners will drop when placed on and moved by a slime block and don’t react when not attached but they stop the movement of a slime block when placed in front of it.

All following blocks will due to various reasons not get moved when next to a slime block but destroyed when in front. Note that none of these are full blocks.
rails, doors, cake, redstone, torches, pressure plates, ladders, buttons, levers, comparator, repeater, snow layers, flower pots, tripwire hooks, string, flowers, saplings, crops (wheat, carrots, chorus fruits...), lava and water
Most likely future additions (regarding 1.12+)
At the time I’m writing this, Mojang announced colored bets and that glazed terracotta blocks will be adjusted so they don’t stick to slime blocks. I don’t have these features, but this information might help you if you’re playing 1.12 or beyond.

Old text – you may ignore this
I didn’t update this blog for quite a few patches. You can find the text explaining how slime blocks interacted with other blocks in older patches here but I decided to write this blog from scratch for the newest version which, at the moment, is 1.11.2 and to make my explanation a lot clearer if I could. If you are interested in what I’ve written before, it’s archived here, but I suggest you just ignore it. ;)

I did a little testing: I tried moving every block Minecraft contains with slime blocks. For time-saving sakes, I'll give you my results. So if you want to build some kind of contraption using slime blocks this will give you a fast look at the types of blocks you could put next to a moving slime block.

There are 23 blocks of interest, of which some can unfortunately only be maintained in creative mode. These blocks could get placed next to a slime block and will not get moved. They also will not allow a slime block to move if they are in its way. Chests might be considered entities but I still put them on this list as it's useful to know, that they can't be moved.
  • Anvil
  • Barrier
  • Beacon
  • Bedrock
  • Chest
  • Command Block
  • Daylight Sensor
  • Dispenser
  • Dropper
  • Enchantment Table
  • Ender Chest
  • End Portal
  • Furnace
  • Hopper
  • Jack O’Lantern
  • Jukebox
  • Melon
  • Mob Spawner
  • Note Block
  • Obsidian
  • Pumpkin
  • Structure Block
  • Trapped Chest
Here are my further notices:

In 1.8 carpets will pop off by getting moved by a slime block even if they are not in its path. The same happens to both kinds of trapdoors and all rails. In 1.9 and 1.10 carpets and trapdoors will get moved by slime blocks like every other normal block.

Decoration blocks so as flower pots and many others would not get moved if they are next to a slime block because their hitbox is too small and doesn’t connect to the slime blocks. They would pop off if they got placed directly in the slime blocks path.

That also counts for leaves and cakes. They get not moved by the slime block but destroyed (not dropped) if they are in its way. Redstone doesn't pop off even if its hitbox connects to the slime blocks.

Slime blocks can move upside down half slabs. Thus, even if the slab is under it and doesn't look like it's connected.

Banners, as they are entities, don't get moved by slime blocks.

Skulls don't get moved when they are on the side of a slime block but destroyed when they are in its way.

Chorus fruits and chorus flowers as well as the other crops don't react when they are on the side of a moving slime block but destroyed when in front of it.

End crystals get moved never the less you are using a slime block in front of a piston or a piston alone.

In 1.9, there were no new for slime blocks unmovable blocks added. Only shulkers - as they are entities, not blocks - do not get moved by slime blocks.

In a pre-release version of 1.10 nether wart blocks did not get moved by slime blocks. Sadly the developers decided to revise this. So in the official release of 1.10, all of the four newly added building blocks stick to slime blocks. Not very exciting for ordinary players but still worth knowing is that the structure block, a creative tool for map makers, doesn't stick to slime blocks.

7 Update Logs

Update #7 : by exsilit 03/31/2017 7:24:25 pmMar 31st, 2017

I rewrote the entire blog. Hopefully, it's clearer now.

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10/17/2019 10:34 pm
Level 1 : New Miner
0BLIVI0Nx avatar
Nlstag: As of 1.14, Pistons can push all cinds of Glazed Terracotta but they do not stick to Slime blocks or Sticky pistons.
05/05/2019 4:21 pm
Level 1 : New Miner
OddMetal2 avatar
Just wanted to let you know that this list has changed dramatically on the recent update
01/30/2019 11:10 am
Level 1 : New Miner
nlstag avatar
Ah, good to know.
I did some research but there is definetly no block that only pistos can move, that a slime block cant.
Sorry about that dumb question of mine.
Sincerely, Nlstag (on mc Thomas_Hoekstra.)
02/06/2019 1:56 pm
Level 66 : High Grandmaster Caveman
exsilit avatar
All right, thanks for letting me know. The question wasn't dumb. ;)
01/08/2019 10:43 am
Level 1 : New Miner
nlstag avatar
Just a quick thing, is there anything a piston can move that a slime block cant? Im willing to make a rocket launch bay to launch a Redstone rocket, But there isnt a 5x5 trapdoor tutorial, and the trapdoor im using is a 3x3 one, and the rocket has slime blocks outside, Sticking to the door itself even if i have unmovable blocks above, Do you know anything, or does this also matter with normal pistons / sticky pistons?
Sincerely, Nlstag (on mc Thomas_Hoekstra.)
01/23/2019 7:12 am
Level 66 : High Grandmaster Caveman
exsilit avatar
Hi! I'm sorry but I can't really help you with that. I haven't even launched the game in the last months. The last time I tested slimeblocks was probably years and many game updates ago. I don't remember which block would fit your needs and there have been a lot of changes to the game. I was thinking about updating this post with 1.14. So that might happen.
However, thank you for nice comment. :)
02/28/2016 4:41 am
Level 36 : Artisan Engineer
Hive_Mind avatar
Very useful, thanks!
I've been using something similar to the Carpet popping off to make a "Blast shield" which falls behind Slime Block Missiles when I fire them into my Explosive Test Chamber.

You put a line of string at the same height as the Missile's maximum height. Then put carpet on that string. Then, put Sand, Red Sand, or Gravel on top of those carpets. Put torches on the side of the Gravel or whatever, then more blocks on top of the torches, until finally you reach a width which completely covers the Explosive Test Chamber. Then, put Anvils on top of that Gravel, of the same height as the Explosive Test Chamber.

The end result is, you fire your missile into the chamber. It breaks the string, and when it breaks the string, the carpet also breaks. That triggers all the blocks to fall. The gravel (or sand, etc) blocks will be destroyed easily by any explosion, but the Anvils will survive just about any explosion. So, it will be a Blast Shield which falls down behind your Missile and contains the explosives to (almost) only within the Explosive Test Chamber.

It will still sometimes blast through 1 or 2 blocks, but before I started using it, it was blowing up 6-7 blocks outside of the chamber.
02/28/2016 4:43 am
Level 36 : Artisan Engineer
Hive_Mind avatar
Oh and I forgot to mention - moving Slime Block machines appear to act like torches, daylight sensors, carpet, etc. in that they break (or just sort of...evaporate) falling blocks. None of my missiles have stopped moving or broken, even though the Blast Shield falls in the center of the missile.

But I play on Console Edition so a lag-free PC might have different issues.
02/28/2016 5:21 am
Level 66 : High Grandmaster Caveman
exsilit avatar
I was just going, it sounds like all these falling entities would cause quite a bit of frame rate issues. Nevertheless, that's a great tip for all who build moving (and expoding) structures with slime blocks. ;) Thank you very much for your nice comments!
02/02/2016 11:09 am
Level 16 : Journeyman Pokemon
blazeman1337 avatar
You forgot Cake :)
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