Completely useless to have a machine that claims 165x165x300 buildvolume when you cannot use it,
even more useless to have Design guidelines and adhere to them and still not being able to work…
But if you organize with the preform tool you get 158.49mm on Y and it fits…
Y dimensions are greater than the previous one…
@Mario_Martinez I’m sorry to hear that there have been some issues with fitting your parts into the build space on your Fuse. You can see that the Bounding Box is larger than the build space. (Screenshot below.) In the first screenshot you provided, a slight tilt should fix that. I’d be happy to take a look at your .form file to see if I can adjust the layout to have them fit as expected.
@Mario_Martinez I wanted to reach out because I did find out that this is a known issue, and we’re working on a fix for it.
Hi Jess, I know. That’s the reason I published it.
There is no logical reason greater dimensions on Y axis after nesting allow it, but smaller ones before doesn’t.
It’s August 2026 and even using the latest preform version the error is still there. The incomodity of needing to cut a part in 3 parts for assembly is not needed when as per the guidelines the parts fit.
Guidelines specify 159.8 both XY and when the part measures 159.55 it just don’t fit. The fix and updates were amazing, so amazing the issues are still present.
Hi @Mario_Martinez, thanks for following up on this thread!
After reviewing your examples with our engineering team, the core issue in both setups is that the outer edges of the parts protrude into the rounded corners of the build chamber.
Our published “Largest Part Size” values specify the maximum length a part can span along a single axis, rather than a solid rectangular prism that fills the entire volume. Because the Fuse build chamber has rounded corners, square or rectangular geometries that extend close to the maximum limits in both X and Y simultaneously won’t clear those corner boundaries.
I understand why this isn’t intuitive when looking at the axis limits alone. To help make this spatial constraint clearer upfront, we’ve updated the Design Guide article you referenced with an explicit note about corner radii impacting XY bounding boxes (which was previously only detailed in our build volume article).
I hope this helps clearing up the printability restrictions you’ve experienced, and thank you for flagging the need for clearer documentation on this topic!
Thank you for taking the time but I disagree, there is something with preform that inhibits to build the part using nylon 12 but it allows it with TPU even when Formlabs own design guide stablish TPU90 buildvolume X and Y values lower than PA12, it will be valuable that the team can take the time to remove PP because there is even a formal sunsetting of PP powder which is not a material that the Fuse series can process anymore.
And here the proof that preform has something built in that is restricting the buildvolume below what is stablished. Is not what you mention and is not that the part is bigger. with TPU the part fits and it’s uploadable, so I hope the team can take the time to solve this.
One thing it may be is the surface armor. I lost space moving from 12 to 12 tough and I have a coworker who would send me a build that fit when using 12 settings and i would open it in 12 tough and it wouldn’t fit. That was because they added more surface armor causing preform to now see an out of bounds or part to part collision.
Edit: But it is weird that TPU looks like it should be more restrictive.
I have tried to reduce it using the preform editor and nothing changes…
Thanks for flagging this, and sorry for the frustration. Planning a part around one number and then finding it does not fit is a bad experience, and the contradicting information on the page did not help.
The build chamber on the Fuse 1+ 30W is 165 x 165 x 300 mm, but the largest part you can print is smaller, for two reasons:
One more thing worth knowing: the shrinkage factors are not fixed. Our materials team tunes them as powder formulations and print profiles evolve, and the updated values ship with PreForm releases. So a table like this one is a snapshot, and the numbers can shift slightly from release to release.
We will update the table to the latest numbers for the current material profiles.
Until then, PreForm is the source of truth. Once you select your printer and material, the bounds it shows already include the scaling and the corner radius, so if a part fits there, it fits in the printer.
