jjagaimo @ jjagaimo @lemmy.ca

Igor Forgor

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2 yr. ago

Considering it was one of the basic labs I did in college physics that pretty much every student has to take, and a significant portion of the classes just do the experiments wrong until they get helped, there's probably just enough familiarity to kinda know what's happening but with major misconceptions.

I was in estimating this myself and part of the problem is that 3d printed plastics are just too tough to shred down through conventional means in many cases. A shredder may work for flat PLA parts like rafts or support material, and a blender may help, but getting small consistent shreds for more complex and dense parts can be challenging. This means using a metal shredder. A powerful blender might be viable for smaller parts that aren't too dense, but you will have to sift them to get consistent grain sizes and regrind anything too large. You could certainly make something a lot cheaper than their shredder that does a decent job, but might require a lot more upfront work and time from you

Then for melting, you might need to use a plastic filter to catch any particulate like dust or sand that has made it in as they might clog a nozzle. Also, you kinda HAVE to use virgin pellets (PLA or other plastic which hasnt yet been remelted), as every melt both degrades the plastic slightly and can evaporate the plasticizers, the additives which make the plastic flexible and tough instead of brittle.

The spoolers typically use a optical sensor which uses infrared light to sense the thickness of the outgoing plastic and speed up/slow down to stretch the plastic more or less as it spools. Usually the nozzle is much thicker than the final filament diameter so that the stretching brings the filament to it's final diameter. Cooling fans cool it down before it makes it onto the spool. Sometimes water is used to cool it down faster but you will probably need to dehydrate the filament to avoid degradation.

You could probably make your own melter and spooler for maybe 300-500. A lot of the cost in such a system comes from the bearings, gearbox, motor, and auger assembly used to melt the shredded plastic and pellets, as it requires a fairly high pressure to feed, and might require custom parts to properly mix the plastics as they go through the melt zones - the high viscosity means they don't mix very well without a fairly narrow gap from auger to wall, which means more pressure required and a stronger motor/gearbox, as well as a slower production rate. The one used in this product doesn't seem too good compared to what I've seen for more hobbyist scale use; the Felfil seems more for research use and small scale tests with small amounts of material. There's also a huge markup which also likely includes engineering costs.

The cost is what typically makes it nonviable. Most hobbyists don't produce waste on large enough scale for it to be viable. Why spend hundreds on a substandard and slow filament production setup when you could buy decent quality filament for the same price? Especially when you're someone who only goes through a few (<20) spools a year. Even for self built systems which can undercut this by a lot, it's not exactly realistic.

For people running print farms it makes sense because they pay a huge margin on top of the material cost for the production of the filament, and they typically have more material to recycle to begin with

The good old "I don't want to admit I'm a douche so let's just stop talking so I can save face"

You don't seem to understand that you are contradicting yourself. You are thanking Israel who has had a long history of genocide against the Palestinians, and is currently killing numerous Palestinian civilians, and yet you want everyone else to encourage peacefulness...

Now children have water when they didn't

Giving them a basic human right back after taking it away isn't something to be commended or thanked. It's something they should never have taken away in the first place and they should be punished for committing war crimes. The Hamas likewise should be punished for their war crimes.

Usually case studies and smaller studies like that help to inform hypotheses and gather information about potential issues or confounding variables before running larger or full scale experiments. They're also cheaper and can help with garnering interest and investment

Hamas attacked first

Hmm

Fuck it, we ball

I prefer 1 night slept in sheets The fitment after you put the sheets and placement of the pillows on the first night is never quite right

Today I got an email from management, something along the lines of "you didnt click the link in this email we sent as a required questionnaire about phishing, some people reported it as phishing: a reminder, all emails from IT@company.com are not phishing"

There was no previous email

I checked the message details and it said "THIS IS A PHISHING TEST BY external company"

It was a phishing test disguised as an urgent reminder to answer a phishing questionnaire, replying to a nonexistent email. I can't wait until Monday when they round up everyone who clicked the link

Many of these types of ideas are to use an easily compostable material and mix it into the plastics as a filler or add tons of binders. The most common 3d printing plastic PLA, is technically biodegradable but will only undergo sufficiently rapid degradation in industrial composters which have elevated temperatures. I was investigating using cellulose acetate based filament but it seems there are still quite a few issues with what I was able to find in the literature (low flexibility and brittle, additives can interfere with biodegradability). Some proposed methods use other plastics that seem to respond well when mixed with cellulose and the same plasticizers but I haven't seen much other literature focusing on making cellulose based (as the main polymer, not as an additive) filament (not printed dissolved in a solvent as a gel and then dried).

https://www.youtube.com/watch?v=jCsnVp6mEbk

As for this method, if using binders that are easily and cheaply made, and are biodegradable, then I see no issue other than needing to use specialized printers. TBH I wouldn't mind prints which can't withstand being dipped in water because most prints probably aren't being wetted anyways.

Qube and anti-chamber if you're a fan of superluminal

Oh man the FreeCAD discussion

I also use fusion and while FreeCAD has improved significantly, it's still lacking in critical areas

The replies are always "but it's gotten better"

Yeah, and it still pops up and error and wrests control away if you dare select a dimension tool and points/lines in the "wrong" order

I mean moreso on the life steal;

He's been dealing with NY screwing him for years after they misfiled his business - they didn't merge his temp license into his actual license once he received it, so when he filed taxes it only applies to the real business license and not the temp license. Because he had the real business license, he no longer had access on his account to see the temp business license. That temp business license then started missing years of tax filings, and they put a lien on his business. Once again, he never knew because he didn't have that business license on his account. Also, he did not get any mail because whoever fucked up merging the licenses in a spreadsheet did it to 400+ businesses and also replaced the address for all of them with some random PO box in another state. That meant that for years he'd been getting denied for loans to try and expand his business unlike other businesses in the same field, because of something he could never have known about. The only reason he did find out was when he decided to move his business to Texas for a number of other NY related reasons (e.g. them trying to stop him doing business for selling abandoned laptops because he didn't register them even though he didn't need to, not giving or responding to inquiries for permits, etc.) And only then once he sold his business and had 1M sitting in his bank account did the bank act nice and give him am agent who then relayed that there had been a lien for almost a decade

More like New York bureaucracy

This lacks a lot of context as both strategies are useful in different circumstances. For a player (A) holding an angle from a far distance, this is true because the person coming around the corner (B) from a short distance to the corner is visible to to A before A is visible to B. This gives the reactor an advantage. This is usually afaik called angle advantage

For a person who is close to a corner peeking a person close to the corner, the opposite can be true due to the delay it takes for the movement to be relayed to the other player's computer. This means that the player peeking may in more extreme cases have a 100-200ms advantage over the reacting player. This is dubbed peeker's advantage.

The effects can vary with latency and distance,

I've printed a few hundred pages with the starter toner they said would only last 30 pages, and just disabled the warning

Depends on your keyboard

I use the default Samsung keyboard (only because of s-pen) and swype typing and its autocorrect are atrocious

I used to use gboard and the autocorrect and swype typing for that were really good.

Might just dump it and go back to gboard

Lemmy.ca says -76

Rather than "Trending" they seem to be newly created communities