# Fuse 1/1+ **URL:** https://forum.formlabs.com/c/support-troubleshooting/fuse-1/40.md [Latest](https://forum.formlabs.com/latest.md) · [Categories](https://forum.formlabs.com/categories.md) · [Tags](https://forum.formlabs.com/tags.md) --- ## [Melted seal](https://forum.formlabs.com/t/melted-seal/45440)
**Author:** [@KuemmeMl](https://forum.formlabs.com/u/KuemmeMl)\ **Replies:** 27\ **Last updated:** [September 28, 2026, 4:25am UTC](https://forum.formlabs.com/t/melted-seal/45440 "2026-09-28T04:25:09Z")
Hello everyone, during the last start of the printing process in our Fuse1, the seal of the Build Chamber melted. Has this ever happened to you? What could be the cause of this? --- ## [When will we meet a hypothetical Fuse2+?](https://forum.formlabs.com/t/when-will-we-meet-a-hypothetical-fuse2/40403)
**Author:** [@Paolo](https://forum.formlabs.com/u/Paolo)\ **Replies:** 13\ **Last updated:** [September 25, 2026, 9:47am UTC](https://forum.formlabs.com/t/when-will-we-meet-a-hypothetical-fuse2/40403 "2026-09-25T09:47:15Z")
How many years do you think we will have to wait? And what should we expect? --- ## [Repeated Perimeter Melting in Fuse 1 -- Build Chamber Gets Stuck](https://forum.formlabs.com/t/repeated-perimeter-melting-in-fuse-1-build-chamber-gets-stuck/46344)
**Author:** [@Seunghoon](https://forum.formlabs.com/u/Seunghoon)\ **Replies:** 4\ **Last updated:** [September 24, 2026, 8:44am UTC](https://forum.formlabs.com/t/repeated-perimeter-melting-in-fuse-1-build-chamber-gets-stuck/46344 "2026-09-24T08:44:35Z")
Hi everyone, We are experiencing a persistent perimeter melting / over-sintering issue with our Formlabs Fuse 1. Symptoms Powder at the perimeter over-sinters and hardens This hardened mass physically blocks the b… --- ## [Fuse+1 Optical Cassette](https://forum.formlabs.com/t/fuse-1-optical-cassette/46723)
**Author:** [@AntHope](https://forum.formlabs.com/u/AntHope)\ **Replies:** 12\ **Last updated:** [September 23, 2026, 8:58pm UTC](https://forum.formlabs.com/t/fuse-1-optical-cassette/46723 "2026-09-23T20:58:19Z")
Hi all! Just wondering if anyone has had the issue shown in the image above. This speckling is on the INSIDE (laser side) of the optical cassette, is always in roughly the same place and is effecting print quality. I… --- ## [The New "Bags" of Powder](https://forum.formlabs.com/t/the-new-bags-of-powder/40421)
**Author:** [@LEADNAV](https://forum.formlabs.com/u/LEADNAV)\ **Replies:** 197\ **Last updated:** [September 8, 2026, 6:22pm UTC](https://forum.formlabs.com/t/the-new-bags-of-powder/40421 "2026-09-08T18:22:04Z")
Got my first 10kg “bag” of SLS powder and I am just curious about your thoughts or tips and tricks so far… The thought of it didn’t bother me but now that it is here I’m just wandering how to best get it into the Sift w… --- ## [Real buildvolume for PA12?](https://forum.formlabs.com/t/real-buildvolume-for-pa12/46147)
**Author:** [@Mario\_Martinez](https://forum.formlabs.com/u/Mario_Martinez)\ **Replies:** 9\ **Last updated:** [September 4, 2026, 1:55pm UTC](https://forum.formlabs.com/t/real-buildvolume-for-pa12/46147 "2026-09-04T13:55:25Z")
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… Even going lower a… --- ## [Speed Optimised](https://forum.formlabs.com/t/speed-optimised/46792)
**Author:** [@AntHope](https://forum.formlabs.com/u/AntHope)\ **Replies:** 4\ **Last updated:** [August 28, 2026, 5:02pm UTC](https://forum.formlabs.com/t/speed-optimised/46792 "2026-08-28T17:02:32Z")
Hi All, anyone else having problems with extreme powder build up in their Fuse1+ printers with the new ‘Speed Optimised’ printing profile? I’m getting print failures every 2 out of 7 prints due to jammed flippers and rec… --- ## [New Fuse1+ PA12 Print Settings v6.0](https://forum.formlabs.com/t/new-fuse1-pa12-print-settings-v6-0/46707)
**Author:** [@CARLAYERS](https://forum.formlabs.com/u/CARLAYERS)\ **Replies:** 2\ **Last updated:** [August 5, 2026, 3:42pm UTC](https://forum.formlabs.com/t/new-fuse1-pa12-print-settings-v6-0/46707 "2026-08-05T15:42:56Z")
Hi, everyone. I just noticed that new print settings for PA12 have been released for the Fuse1+ with Preform 3.60.4. These are labeled “Default v6.0,” while the previous default profile has been renamed “Speed Optimize… --- ## [Blast "residue" people get in here](https://forum.formlabs.com/t/blast-residue-people-get-in-here/46673)
**Author:** [@SMute](https://forum.formlabs.com/u/SMute)\ **Replies:** 2\ **Last updated:** [July 31, 2026, 2:24pm UTC](https://forum.formlabs.com/t/blast-residue-people-get-in-here/46673 "2026-07-31T14:24:27Z")
I was dealing with this issue for a while. Consensus seems to point toward it being breakdown of the tumbler liner or blasting media. Ive thought it could perhaps relate to desiccant dust, so I removed my desiccant bas… --- ## [TPU vacuum nozzle attachment for fuse 1+](https://forum.formlabs.com/t/tpu-vacuum-nozzle-attachment-for-fuse-1/46683)
**Author:** [@ashworth](https://forum.formlabs.com/u/ashworth)\ **Replies:** 0\ **Last updated:** [July 29, 2026, 2:05am UTC](https://forum.formlabs.com/t/tpu-vacuum-nozzle-attachment-for-fuse-1/46683 "2026-07-29T02:05:26Z")
Hi, just sharing a file. fuse1+ nozzle v1.stl (431.1 KB) Works well for cleaning up the chamber after prints and as its TPU less likely to scratch surfaces. Print on an FDM printer in TPU in the vertical position. --- ## [Some problems](https://forum.formlabs.com/t/some-problems/46671)
**Author:** [@R2D2](https://forum.formlabs.com/u/R2D2)\ **Replies:** 4\ **Last updated:** [July 28, 2026, 1:07pm UTC](https://forum.formlabs.com/t/some-problems/46671 "2026-07-28T13:07:02Z")
Hi, we are working with three similar materials. One works fine, the others are producing error 217. Any suggestions to circumvent this obstacle? Thanks in advance --- ## [Change in materials](https://forum.formlabs.com/t/change-in-materials/46645)
**Author:** [@Andreasemilsson](https://forum.formlabs.com/u/Andreasemilsson)\ **Replies:** 8\ **Last updated:** [July 21, 2026, 7:28am UTC](https://forum.formlabs.com/t/change-in-materials/46645 "2026-07-21T07:28:42Z")
Hi all, This is a question for you who specifically print with Nylon 12GF. A few months ago i suddenly noticed that the surfacearmor and powder in general was much harder to remove. If this was on a particular printer … --- ## [Maintenance advice](https://forum.formlabs.com/t/maintenance-advice/46626)
**Author:** [@Mario\_Martinez](https://forum.formlabs.com/u/Mario_Martinez)\ **Replies:** 4\ **Last updated:** [July 15, 2026, 7:48pm UTC](https://forum.formlabs.com/t/maintenance-advice/46626 "2026-07-15T19:48:31Z")
To all fellow fuse users, My fuse 1 has 4500 hours in. It was pre owned by one of the only 2 country resellers and I received it nov 24 with ~1300 hours. It was maintained before delivery, RTD, upper window, filters, f… --- ## [PreForm "Fill Chamber" Bugs](https://forum.formlabs.com/t/preform-fill-chamber-bugs/46527)
**Author:** [@LEADNAV](https://forum.formlabs.com/u/LEADNAV)\ **Replies:** 1\ **Last updated:** [June 29, 2026, 12:30pm UTC](https://forum.formlabs.com/t/preform-fill-chamber-bugs/46527 "2026-06-29T12:30:51Z")
Just wandering why now the “Fill Build Chamber” function in Preform is packing the chamber outside of its boundaries…making it pretty useless when you have to go back and bring parts within bounds of the chamber? Its th… --- ## [Fuse 1+ Speed Optimized problems](https://forum.formlabs.com/t/fuse-1-speed-optimized-problems/38625)
**Author:** [@snapfaab](https://forum.formlabs.com/u/snapfaab)\ **Replies:** 10\ **Last updated:** [June 26, 2026, 1:40pm UTC](https://forum.formlabs.com/t/fuse-1-speed-optimized-problems/38625 "2026-06-26T13:40:28Z")
Dear Community, Is there anyone who is using a Fuse1+ with PA12 Speed Otimized settings and getting good results? Our specs: PreForm 3.37.5.370 FW 1.18.2 30% Material refresh 32% packing density Bed Temperature Offse… --- ## [Air intake pressure error](https://forum.formlabs.com/t/air-intake-pressure-error/41123)
**Author:** [@Mario\_Martinez](https://forum.formlabs.com/u/Mario_Martinez)\ **Replies:** 11\ **Last updated:** [June 23, 2026, 5:52pm UTC](https://forum.formlabs.com/t/air-intake-pressure-error/41123 "2026-06-23T17:52:38Z")
After a lot of search and research. I haven’t found any information that points out to a current error on my Fuse 1. I have already contacted support with this issue, but now asking to the community. As suggested by su… --- ## [Fuse 1+ Global Melting](https://forum.formlabs.com/t/fuse-1-global-melting/44075)
**Author:** [@jmasterson](https://forum.formlabs.com/u/jmasterson)\ **Replies:** 48\ **Last updated:** [June 22, 2026, 4:55pm UTC](https://forum.formlabs.com/t/fuse-1-global-melting/44075 "2026-06-22T16:55:53Z")
Printer Details: Fuse 1+ 30W, Nylon 12, 50% Refresh, Default Print Settings, -1.5°C Bed Temp Offset, 1900 hours, UPS I’ve been dealing with global melting issues since early December, and unfortunately, it’s back again.… --- ## [SLS Top Surface Warping](https://forum.formlabs.com/t/sls-top-surface-warping/46394)
**Author:** [@LEADNAV](https://forum.formlabs.com/u/LEADNAV)\ **Replies:** 3\ **Last updated:** [May 16, 2026, 12:18pm UTC](https://forum.formlabs.com/t/sls-top-surface-warping/46394 "2026-05-16T12:18:10Z")
Thought this was pretty funny this morning… I have had entire threads about this subject…with dozens of back and forth emails to support and even a Formlabs rep here onsite…all acting like this was not “typical” and try… --- ## [Fuse 1 Quartztubes](https://forum.formlabs.com/t/fuse-1-quartztubes/43844)
**Author:** [@Andreasemilsson](https://forum.formlabs.com/u/Andreasemilsson)\ **Replies:** 37\ **Last updated:** [May 8, 2026, 6:27am UTC](https://forum.formlabs.com/t/fuse-1-quartztubes/43844 "2026-05-08T06:27:00Z")
Has anyone experienced issues with the quartz tube assembly on their Fuse 1 printer? We are experiencing low output on both quartz tubes, but never at the same time. I can proceed in Preprint if i ignore the warning, bu… --- ## [Build chambers are not good](https://forum.formlabs.com/t/build-chambers-are-not-good/46295)
**Author:** [@bigdogsteel](https://forum.formlabs.com/u/bigdogsteel)\ **Replies:** 4\ **Last updated:** [April 23, 2026, 4:53pm UTC](https://forum.formlabs.com/t/build-chambers-are-not-good/46295 "2026-04-23T16:53:27Z")
One of these is a trash can, the other 3 are junk. Its hard for me to fathom that these build chambers are not rebuildable or able to be reconditioned in any way. For this pic (2) of them have plug issues and one has a… --- ## [Systematic Beadtearing & Rapid Optical Clouding across 3 units (Fuse 1 & 1+) – Seeking Advice](https://forum.formlabs.com/t/systematic-beadtearing-rapid-optical-clouding-across-3-units-fuse-1-1-seeking-advice/46233)
**Author:** [@Andreasemilsson](https://forum.formlabs.com/u/Andreasemilsson)\ **Replies:** 9\ **Last updated:** [April 9, 2026, 3:37am UTC](https://forum.formlabs.com/t/systematic-beadtearing-rapid-optical-clouding-across-3-units-fuse-1-1-seeking-advice/46233 "2026-04-09T03:37:11Z")
Hi everyone, I’m reaching out to see if anyone else has encountered a sudden, systematic failure across multiple units. We are running two Fuse 1 and one Fuse 1+ units, and all three have started exhibiting the exact sa… --- ## [Fuse 1+ self prime after print](https://forum.formlabs.com/t/fuse-1-self-prime-after-print/45659)
**Author:** [@CARobertM](https://forum.formlabs.com/u/CARobertM)\ **Replies:** 36\ **Last updated:** [February 25, 2026, 5:08am UTC](https://forum.formlabs.com/t/fuse-1-self-prime-after-print/45659 "2026-02-25T05:08:14Z")
has anyone else had this happen? I started a Nylon 12 bed temp tuning calibration print yesterday. I got the text that it finished early this morning and when i got to work the machine was in a Primed state and the came… --- ## [Phantom Menu Selections](https://forum.formlabs.com/t/phantom-menu-selections/45783)
**Author:** [@AntHope](https://forum.formlabs.com/u/AntHope)\ **Replies:** 13\ **Last updated:** [February 21, 2026, 3:19pm UTC](https://forum.formlabs.com/t/phantom-menu-selections/45783 "2026-02-21T15:19:55Z")
Just wondering if anyone has had any issues with their Fuse1 printers randomly selecting things from the menu? I’ve had it on multiple occasions whilst printers have been idle overnight that things have been selected. I … --- ## [Mixer/Sift Issues](https://forum.formlabs.com/t/mixer-sift-issues/46010)
**Author:** [@AntHope](https://forum.formlabs.com/u/AntHope)\ **Replies:** 3\ **Last updated:** [February 9, 2026, 2:56pm UTC](https://forum.formlabs.com/t/mixer-sift-issues/46010 "2026-02-09T14:56:30Z")
Hi All! Just wondering if anyone has had similar issues with their Fuse Sift cartridge mixer. We’ve had the machine nearly a year now and have 7 Fuse+1 printers to go with it. Just before Christmas we had a problem whe… --- ## [Nylon11 CF clumping at printer material hopper](https://forum.formlabs.com/t/nylon11-cf-clumping-at-printer-material-hopper/43286)
**Author:** [@chengsam2000](https://forum.formlabs.com/u/chengsam2000)\ **Replies:** 1\ **Last updated:** [January 24, 2026, 4:10am UTC](https://forum.formlabs.com/t/nylon11-cf-clumping-at-printer-material-hopper/43286 "2026-01-24T04:10:21Z")
i got 2 print recently that has been fail due to the powder been clumping at printer matgerial hopper when ever it happen, it always have result like the picture and when i stick a stir rod inside material and gice … --- ## [Delfin Vacuum Pre Separator](https://forum.formlabs.com/t/delfin-vacuum-pre-separator/45848)
**Author:** [@SMute](https://forum.formlabs.com/u/SMute)\ **Replies:** 1\ **Last updated:** [January 21, 2026, 8:45am UTC](https://forum.formlabs.com/t/delfin-vacuum-pre-separator/45848 "2026-01-21T08:45:57Z")
The Delfin vacuum is reliable and high quality, it does a great job of keeping things clean and powder where it belongs, however the filters are fairly expensive. It makes sense to use some type of pre separator to remo… --- ## [New Fuse 1+ 30W](https://forum.formlabs.com/t/new-fuse-1-30w/45927)
**Author:** [@R2D2](https://forum.formlabs.com/u/R2D2)\ **Replies:** 7\ **Last updated:** [January 14, 2026, 2:50pm UTC](https://forum.formlabs.com/t/new-fuse-1-30w/45927 "2026-01-14T14:50:28Z")
Unpacked machine and started it. Registration in Dashboard successful. I can select the machine in PreForm. But Hopper Level says N/A. We´re waiting for License Key for the Open Material Mode. It says also Build chamb… --- ## [Lowering Fuse Sift Refresh Rate](https://forum.formlabs.com/t/lowering-fuse-sift-refresh-rate/45892)
**Author:** [@minaschaafsma](https://forum.formlabs.com/u/minaschaafsma)\ **Replies:** 2\ **Last updated:** [January 6, 2026, 8:37pm UTC](https://forum.formlabs.com/t/lowering-fuse-sift-refresh-rate/45892 "2026-01-06T20:37:15Z")
Hi everyone, I’m looking for some guidance and shared experience regarding refresh rates when using the Fuse and Fuse Sift with Nylon 12 (PA12). We’re currently running into an issue where excess recycled powder is acc… --- ## [Door not locking? This is most likely the solution](https://forum.formlabs.com/t/door-not-locking-this-is-most-likely-the-solution/45875)
**Author:** [@Andreasemilsson](https://forum.formlabs.com/u/Andreasemilsson)\ **Replies:** 1\ **Last updated:** [December 29, 2025, 8:28pm UTC](https://forum.formlabs.com/t/door-not-locking-this-is-most-likely-the-solution/45875 "2025-12-29T20:28:55Z")
I had a strange issue today. After removing a printed chamber and cleaned out the printer. I was about to start another when i noticed the door did not lock in place. I checked the latch if it was crooked etc. Looked … --- ## [The Fuse 1 cannot print Nylon 12 GF reliably](https://forum.formlabs.com/t/the-fuse-1-cannot-print-nylon-12-gf-reliably/34521)
**Author:** [@LEADNAV](https://forum.formlabs.com/u/LEADNAV)\ **Replies:** 78\ **Last updated:** [December 19, 2025, 11:49pm UTC](https://forum.formlabs.com/t/the-fuse-1-cannot-print-nylon-12-gf-reliably/34521 "2025-12-19T23:49:07Z")
To branch off our in depth review topic… We are unable to get Nylon 12 GF to successfully print on a Fuse 1. Curling of the extra thick surface armor at the start of the print/chamber will not allow it. It’s a crap sho… [Next page](https://forum.formlabs.com/c/support-troubleshooting/fuse-1/40.md?page=1)