$1200 is a lot, and it would be a straight dealbreaker to me as well. But I also noticed it draws 580W, which is a lot too.
Besides not wanting to waste the money, I doubt the lamp will last 5 years (not 5 years of projected use of XX minutes per day…). 580W converted to heat on a small disk will take its toll.
~100 lumens per watt is rather poor, especially given the cost. It's the same as a standard LED lightbulb, and that includes the miniature AC voltage converter.
150lm/w would make it at least a cut above domestic lightbulbs.
fwiw, LEDs with higher CRI will generally be less power efficient, so the premium category has a 3-way tradeoff between brightness, power, and color quality. It's common for high efficiency LED lightbulbs to be much worse at illuminating red objects.
True enough, although CREE's XT-E offers 140 lm/w at a CRI of 80 and a colour temp of 3000k.
I assume this product has not met any regulatory requirements, because selling a ~600W hot plate suspended at eye level cannot be legal.
These LEDs are just the ones found on imported LED strips. Adjustable colour temperature is a novelty that is not compatible with LED efficiency or lifetime.
Fair point. Given that this product has adjustable colour temperature, I really doubt all of the lumen, CRI and watt values. It sounds like the designer also got stung when the chosen LEDs didn't give the expected power output.
Is it, though? Most of the LEDs I've seen are very similar, and lower temp LEDs are slightly less efficient. If it were 60lm/watt I'd be a bit surprised, but 100lm seems pretty typical. Maybe not "well engineered", but average. (Which, with all due respect to the founder, seems the quality of the product.)
CREE offer a variety of LED types with efficiencies 150lm/w (eg CMB, XT-E), up to 230lm/w (eg, 5050).
While 100lm/w is typical for domestic LED lighting, it's going to cause problems when the total power is several orders of magnitude higher but the form factor is approximately the same size. That heatsink will probably fry an egg, and I wonder about the lifetime of the diffuser plastic.
Q: Does it get hot/how is it cooled?
A: It's cooled through our large heatsink and ultra quiet Noctua fan. The fan only turns on above 75% brightness. At max power, the heatsink is cool enough to put your hands on it for a couple of seconds.
It's still dissipating near 600W. "I can put my hands on it for a few seconds" tells me it's dangerously hot and would not pass any kind of safety certification. How many other objects do you have in your house that heat up to a similar degree? How many of those objects would you like suspended at eye level with no particular safety guards?
ASA and ABS really need a good filtration. Like actual filtration, not what the enclosure has. I personally just run a duct to my window and vent outside.
This review [1] cites the absolute highest amount of emitted styrene in the studies they are reviewing to be 113 μg/min. Using [2] for simplicity with styrene's molar mass (104.15 g/mol), we get to a printer creating at most 0.024 ppm of styrene per minute per m3 of unchanged air. For comparison, the "work exposure limit (WEL) for styrene is currently 100 parts per million (ppm) averaged over an 8-hour day" [4].
In other words, as long as you have some air exchange in the room, you'd be orders of magnitude away from the safe work exposure limit on styrene.
It also makes sense, considering that it's a microscopic amount of molten plastic, whereas injection moulding factories work with vats of the stuff.
There are active studies on chopped CF inhalation/contact hazards, and the SEM images in the above post prove how it occurs.
A lot of plastics contain wide assortments of additives to obtain mechanical properties. Outdoor ventilation is absolutely preferable to filtration or smell reduction filters that does practically nothing about carcinogens.
PLA is comparatively low emission, but a slow cooking PTFE tube in many hot-ends is not something people should be around. ymmv =3
There are different kinds of carbon fibres. It'd be great if it wasn't just Prusa disclosing which type they are using or offering studies on their impact, but in the meantime we can just use CF Prusament to be sure: https://www.reddit.com/r/3Dprinting/s/nQ5zUwnrWZ
Most filters have limited effective life for VOC, and "safe" use is measured in a few hours at most. Venting outdoors into a fern/decorative-plant filled yard is the preferred option for both FDM and Resin printers. Most activated charcoal filters just reduce the smell, and do nothing about the the harmful parts even with HEPA14 filters etc.
Chopped CF filled FDM filaments are mostly a scam, but there are few PETG and ASA viable options:
One challenge designing a metal-printing process was making it safe for people without prior lab-safety training. Some 3D additive processes are simply just not practical for careless "yolo" consumers. =3
CF filled filaments aren't a scam, they just have different tradeoffs: more rigid, nice surface finish, and less warping (all useful qualities!), but also lower layer adhesion, lower tensile strength, and less toughness. It's not just anecdotal, Igor Gaspar collected a lot of hard data on that.
Apart from the reply you've already received, most the bad stuff like plastic nanoparticles in the air and many hard to detect VoCs are also rather blatantly an issue with PLA and other filaments.
People focus too much on smell as the only indicator.
That was my setup until recently. The ads are YT blocked well on iOS but it kept having hiccups on iPadOS. I switched to uBlock in safari and it works well. I wish it showed what is being blocked on each page instead of the little counter in the icon.
I got the same email (for my Pro account). And all the limits they set have nothing to do with their reason for setting them. Pro is so limited already that people “running 24/7” is a total nonsense.
I was going to create a website just like this but for my Audi Q5. Least reliable car I ever owned. It’s been in the shop about 15 times in 2 years. I finally gave up. It still has a few unsolved issues but I just don’t care. I’ll be trading it in later this year and … Never another Audi again.
Maybe not as old. I deployed a few racks of HP Alpha DS25s in 2007-2008 before they were replaced with Itanium based Blades (running OpenVMS 8.4). I do not miss working with OpenVMS one bit. It was rock stable (basically an on/off appliance) but the user experience left me wanting (coming from Linux).
I can see how they may be still stuck on Alphas because unless they can somehow simply recompile for x86-64 OpenVMS, it’s a complete rewrite from scratch.
Besides not wanting to waste the money, I doubt the lamp will last 5 years (not 5 years of projected use of XX minutes per day…). 580W converted to heat on a small disk will take its toll.