how to change move increment? + default cube spawning size?

[agile marten]

(Result for "java-sizelimit")
General information: Java block and item models can only contain elements between -16 and 32 in the edit mode (which is the equivalent of 3 blocks ingame).
They are limited to this size by the format, not just by Blockbench!

Item models can be displayed larger by going to the display mode (option in the top right) and using the scale sliders in the relevant displays to resize the model.
Maximum size in ingame blocks for the different slots (when the model is 3x3x3 blocks big in edit mode and scale is set to 4) for a player (or play-like entity):

Slot | Size | Base Size Multiplier
Head | 7.5 | 0.625
Hand | 12.0 | 1.000
Item frame | 6.0 | 0.500
(Formula = 3 x 4 x base_size_multiplier)

Keep in mind that a model stops rendering with the entity holding/wearing it. An entity stops rendering once its hitbox is not in your point of view anymore.

1.19.4 and newer: Item displays
If you wanna have models that are placed in your world (so not in an entity's hands etc.) you can use item_display entities.
Item_display entities have no scale limit and render even if the entity is not in your POV (unless actively specified otherwise).
/summon item_display ~ ~ ~ {transformation:{scale:[2f,2f,2f]},item:{id:"minecraft:stick",Count:1b,tag:{CustomModelData:1}}}
This would summon an item_display entity using the CustomModelData:1 model of a stick, and display it twice as large than it is in Blockbench's Edit Mode.

PS: You don't need to use CustomModelData if you don't want to, this is just an example. There is also a lot more settings this entity can have (offset, rotation, shadow, brightness etc.). More information about the entity can be found in https://minecraft.fandom.com/wiki/Display#Entity_data or in generator websites like https://mcstacker.net/ .

[rose plinth]

!faq precise-movement

[agile marten]

To move/scale cubes in smaller increments than 1 you can hold the following key combinations:
-Shift: 0.25
-Ctrl: 0.1
-Ctrl+Shift: 0.025
If those default values are not to your liking you can change these incrementsin File > Preferences > Settings > Snapping

PS: If you want to allign 2 elements we suggest using the vertex snapping tool instead (see !faq vertex-snapping for more info)
Disclaimer: The modded entity format does NOT allow decimal cube sizes and neither does the Optifine Entity format if box-uv is enabled!

[rose plinth]

You can also change the default cube size

Though, you say you have a 256x long sword. Is that just supposed to be a "flat" one (like a default item)? or is it actually 3D?

so custom shape, not just texture, but a bit thicker

well, your best bet is to temporarily disable the size limit, make your model, scale it down via Transform > Scale so everything is inside the size limit enable the limit again, then scale it up in the display settings again.

Though as the first bot message said the biggest it can be in a player's hand is 7.2 (full) blocks.

well, that's the 48x48x48 area

(3 blocks on each axis)

and if you give it a scale of 1.6 in the (hand) display settings it will be the same size in the hand as it is in the Edit mode

because otherwise all default items would be really big I guess?

actually, default item display settings scale it down even further 🤔 (0.68 and 0.55 for first- and thirdperson hand slots)

no idea then, you'd need to ask Mojang why they decided to do it like that 🤷‍♂️

[rose plinth]

zoom further to where?

also, in or out?

[rose plinth]

most likely cause that one cube is at position 0.125?
That or it's at position 0 and the next size increase would make it larger than 32

yeah, cause any next size increase would make it larger than 32, no?

yeah, and 31.875 + 1 = 32.875, which is bigger than 32

well you gotta start with that info, else I assume default settings

just type in 32 into the size value field