Kernel Bob 
@3dprinting Finally, I upgraded my MMU3's firmware. Prusa released MMU3 performance improvements last week; that's a nice bonus for a printer that's 4 generations old.
🧵 92/∞
Massive MMU3 speed boost: New FW slashes filament change times + CORE One L MMU3 news - Original Prusa 3D Printers
The MMU3 has been our workhorse for single-nozzle multi-material printing, and before it hands the baton to the upcoming INDX system, we wanted to give it one last significant upgrade. We usually design our hardware with some headroom, so it can...
@3dprinting The original took too long to assemble, with 20 screws. This one snaps together.
I made a compliant bushing to hold it onto the aluminum rails inside the drybox. I'm not sure that was an improvement. It does hold snugly, though.
🧵 91/∞
@3dprinting While I was there, I decided to replace one of the auto-rewinder spools that had cracked in the last few months. And then I decided to redesign the spool holders. I'd always thought it should be easier to insert a spool.
So I came up with this design. The tall post behind the spool makes it so you can't (easily) push the spool past the slot. Just push it up against the post, then drop it into the slot.
🧵 90/∞
@3dprinting 49 days ago, my printer's hotend fell out. I wrote about it here.
This week I finally repaired it -- travel and procrastination... The repair was straightforward; the hard part was cleaning off my workbench so I had room to work on it. 😒
https://chaos.social/@kbob/116063218020236097
🧵 89/∞
@castaway Y'know, I've been thinking of making a pinned post that lists them all. Haven't gotten around to it yet. When I want to append to one, I either use its hashtag like #BirthdayTower or #BlackLackStackHack or else I search my image history for a photo from the thread.
I try to tag them with #BuildThread, but I don't do it consistently. I also try to give them sequence numbers like 🧵 42/N.
@3dprinting Now I have storage for various print bed sheets.
This is the Expandable Steel Sheet Holder by Whity, upside down because I'm left handed.
https://www.printables.com/model/51462
And the printer plays on.
🧵 88/∞
@3dprinting I lifted the drybox up on stilts. While it was feeding filament to the running printer. Now there's 62mm of clearance under the box.
Upthread in 🧵 66 I showed how the drybox is removable. It still is, it's just closer to the stratosphere.
🧵 87/∞
@3dprinting Upthread in 🧵 84 I said that sometimes the filament tube inlets come off. I've addressed that issue by creating bendable clips that hold the inlets in place. Tool-free, of course.
These photos also show the six-to-five adapter. The (Un)original Prusa Drybox is designed for six spools. The MMU3 uses five. So I made an adapter. (It's a refinement of a similar adapter seen here. https://www.printables.com/model/702217-mmu3-mmu2s-5-spools-auto-rewinder-adapter-for-unor/files)
🧵 86/∞
@3dprinting Tonight I finally put the printer enclosure where it goes, a mere ten months after I started designing it. It's no longer blocking the closet doors. The old Prusa MK3 enclosure is on the right and is inferior in every way.
I really need some LEDs in the drybox.
That's all the further the lid will open now. But the filament tubes look tidy with the lid up.
🧵 85/∞
The bad:
- Full spools have enough angular momentum on retractions that sometimes they pull the tube inlets off. Then the filament wraps around the axle.
- The tubes in the back are free and floppy and not parallel. (aesthetic)
- The back panel is flimsy. It's corrugated plastic, and it bends a lot when removed.
🧵 84/∞