Awesome video. Prusa sends AG Silver with all the replacements you buy from them (they will send you this if you buy a heatbreak, heatsink or heatblock). The thermal conductivity of this one is 3.8 W/mK and can handle up to 250°C constant temperatures (more than enough for the heatsink section). I've seen higher Thermal Conductivity in CPU thermal pastes, but these cannot work for such temperatures for a long time. I tried using regular Thermaltake in an extruder and it dried up super fast, caused a clog and I had to replace it. So it may be worth re-running the tests
As another engineer watching this video, I have to commend your excellent work. This is worthy of a masters thesis. Your assumptions are solid and your insights are very astute. I especially love that your measured temps by sticking a thermometer down the throat were spot on (simple yet brilliant). I purchased one of the Trianglelab Titanium designs and plan on replacing it next time I get a chance.
As an engineer watching your vid was like: maybe there's still hope in human sense and science. I very much appreciate the effort you have put making this. I'm among the Mini users who don't have problems (luck) printing with any filaments however I ordered the Bondtexh extruder and heatbreak in any case but as per your experience I won't switch it. Don't fix it if it isn't broke. Thanks for your very thorough work and keep on!
If you use some really good thermal paste (boron nitride) on the Stock Heatbreak, will it be enough to solve the PTFE shrinkage issues? And would it change the values enough to require a PID tune? I am keeping mine as close to stock as possible as I want to be able to stay current with the firmware updates they are working on.
I tried Bondtech heatbreak and compared with Mini original one it has shorter heating zone that causes never ending problems with Prusament PLA. Could you please also add E3D Revo heatbreak in the simulation?
Damn, that Kobra Max is a huge printer. I think an upscaled version of this structure would work, as the policarbonate sheets are big enough to cut 1000mmx1000mm panels. But you need something bigger than a lack table as a base, that's the part where it gets tricky.
PLEASE DON'T void your warranty like I did because there is not much to gain. I realized the Marlin implementation of PID autotune isn't really good. I'll try to cover that later. Also at 5:20 I made a mistake and the selected a too big area for air heat convection on the Copperhead (you can see the it highlighted by blue). I think it doesn't change much because the heat transfer coefficient is so small compared to the thermal paste, it barely makes any difference.
Can you please share the sheet drawings in one of these formats? .dxf, .dwg, .ai or .eps. I will use sendcutsend and they need drawings from these formats.
Sorry I only have PDF. I don't have a commercial Fusion license now, so I can't generate those formats now. But the .F3D and .STP files are on GrabCAD, you could use CAD to generate .DXF based on that.
Can you please share the technical drawings for the sheet cutting? grabcad link doesnt work. Also whats the difference between this and Alexander Müllers design?
The GrabCAD link was broken for some reason, now I fixed it. Alexander's design is meant to circulate air inside the enclosure, mine draws air out to create a low pressure zone inside.
I said "a wall tile in addition to vibration insulation" but nowdays that I upgraded to a concrete paver. Work very well. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-g7CxCu4_yFQ.html
You should consider watching some safety guides on circular saws. Your helper was sitting in the cutpath, fingers and elbow occasionaly crossing it too. Fingers in general too close for comfort. Even worse you put your left hand flat on the cutpath while finishing your cut. If you would have gotten a kickback at that moment you might have considerably less digits today. In the future, if possible, Clamp down your piece. If a helper is needed have them hold the piece as far away from the blade as possible only applying Force straight down to not slip into the blade. Also have them be positioned to the side rather than be in the front to avoid getting cut while you are fighting a kickback, getting startled by something or distracted. Sorry for being a buzzkill, the project looks great but that part got me terrified. Safety first!
I got my info here: smartairfilters.com/en/blog/can-hepa-filters-capture-nanoparticles/#:~:text=OK%2C%20so%20diffusion%20captures%20nanoparticles.%20But%20how%20many%20nanoparticles%3F%20Maybe%2050%25%20of%20nanoparticles%3F%20It%20turns%20out%20that%20diffusion%20is%20far%20more%20effective%20than%20that.%20According%20to%20NASA%2C%C2%A0HEPA%20filters%20capture%20%E2%80%9Cvirtually%20100%25%20of%20particulates.%E2%80%9D
Awesome video! I'm really struggling trying to guess the way you managed to screw the bolts on the plexiglass... how did you do that without adding nuts nor tapping the acrylic? Thank you so much for the video!
Really great video. I was wondering about draft as well. While I don't believe enclosure should or are supposed to be airtight, I thought one of the main reasons for enclosures besides heat retention was to avoid drafts to prevent warping and poor bed adhesion for materials like ABS and maybe even PETG [even PRUSA said to have enclosure doors open for PLA printing]. Have you found any problems caused by the airflow in your build? It looks amazing btw, way better than the traditional LACK stack.
In response to your own comments about the LACK acting as a soundboard, I recommend checking out CNC Kitchen's video... especially since your design affords extra vertical space. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-y08v6PY_7ak.html
Thanks for the kind words! Yeah ABS is tricky. I kept the door fully closed, with fan running at absolute minimum and still had adhesion issues. Sadly filter didn't 100% get rid of the smell. So I halted ABS test until some day maybe I come up with an improved filter setup.
you can print the enforcements for the Lack legs so that it doesn't wobble that much. I've used lack for 4 years now, and wobbling is not fatal, though : )
Beautiful and elegant design. I commissioned a store glass cabinet maker to enclose my Ender 5 Plus. Very heavy to assemble but worked well. A good learning experience.
