http://forums.reprap.org/read.php?177,767087,778191#msg-778191 --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Thu, Jul 20, 2017 at 11:07 PM, Vincent <[email protected]> wrote: > Any status update on the 3D printing issues? > > > On 05/19/2017 07:03 AM, Luke Kenneth Casson Leighton wrote: >> --- >> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68 >> >> >> On Fri, May 19, 2017 at 5:08 AM, Neil Jansen <[email protected]> wrote: >> >>>> and now you can use a 24v heater you can spend another extra $5 on an >>>> E3Dv6 volcano clone, now you can get *another* 20% increase in speed >>>> for only a 2.5% increase in budget. >>> >>> As you can see from the pics, we ran on the cheapest 12V power supplies that >>> we could find. Before that I tested 24V, it wasn't worth the cost. Again, >>> brickwall economics here. We went cheap. The 12V power supplies were >>> purchased in bulk and were maybe $14 USD each? >> >> yeh meanwell's my favourite and there's no difference between 12 and >> 24v prices. >> >>> The 3D printed mounts and >>> the little PCB's were practically free and it would turn the supply on and >>> off between jobs whereas our 24V bricks were on all the time. The ONLY >>> thing that we splurged on at the time was the E3D nozzles and that was more >>> of a crapshoot. I would have done better to cheap out on those as well, I >>> could have printed more reliably with the cheaper J-Heads. >> >> i wonder what was going on as the only time i've had problems with an >> E3Dv6 is when the fan on the heatsink wasn't running. that was bad. >> heat travelled up the tube and melted the filament *above* the hotend >> entry point. all bets were off at that point. >> >>> Don't bother minimizing extrusion if you do end up redesigning (gah!). It's >>> cheap as dirt nowadays if you're buying the generic stuff. If you want >>> rigid, well there you go. >> >> i do - and i know how it's achieved. i've had an excellent 3D visual >> manipulation ability for like... 35 years. >> >>> I have a junk box full of Melzi's, they were horrible, but it was all >>> manufacturing defects from a crappy Chinese company. The Chinese version >>> took some artistic leeway that the original (British IIRC?) designer >>> probably never intended. >> >> aiyaaa... >> >>> I've used both as I've said. Mine never stalled out. I used cheap-as-dirt >>> A4998's. Of course, I was running them < 100mm/sec and they were happy >>> there. >> >> yehyeh. >> >>>> i just... i can't bring myself to spend backers' money on stuff that >>>> i know is crud, neil. >>> >>> You're starting to sound like a German engineer now :) They're not crud if >>> you use them within the constraints that I outlined. No need to turn your >>> nose at them. What I'm trying to get at is that you've got this huge point >>> of diminishing returns, you can place yourself on either side of it. >> >> i will stop when the speed/$ improvement is parity. anything that >> gives a 1:1 ratio (or less, obviously) is not worth it and is "out"... >> *unless* an improvement can in turn have a cascade effect of allowing >> *another* improvement that *does* increase the speed/$ ratio. >> >>>> sso i've been spending some time tracking down board designs and so >>>> on. Arduino Due: https://world.taobao.com/item/539393961702.htm RMB >>>> 75 so that's around $12. >>> >>> Dang those Due's are getting cheaper, back in my day those were a pretty >>> penny. >> >> yehyeh - my favourite's the STM32F072 as it has a built-in crystal (a >> not very good one) but then the PLL can phase-lock to the USB bus from >> whatever it's connected to, compensating for crystal inaccuracies. >> price? $1.70. STM32F072-NUCLEO board? $10 on digikey. >> >> mad. absolutely mad. >> >>>> and TRAMS uses TMC2100s, where their Reference Design has full PCB >>>> and schematics available: if i'm doing 10+ i can just send that to >>>> mike and he can make them. TRAMS is *real* basic. 4 steppers, 2 >>>> beefy power MOSFETs (extruder, printbed), 2 smaller ones for fans. >>> >>> <3 TMC2100's. Our PnP was going to use TMC2130's. Great German drivers. >>> However #1 they're hard as shit to import into China, which sucked for us at >>> the time. You can get damn near anything in China but this was one of those >>> parts that just isn't really something that they use. It was, to this day, >>> the only part that I could not find on Taobao. We may have smuggled our >>> samples in from Hong Kong. >> >> dang. >> >> well.. >> https://world.tmall.com/item/551108503978.htm?spm=a312a.7700714.0.0.3zdhiQ >> RMB 23. about $4. >> >> so that looks prooobably like it's sorted... >> >>> #2 they're only really necessary if you want to >>> squeeze performance out of your stepper motors. For our farm we never did >>> that, we didn't need to. >> >> $200 for a 50-100mm/sec printer with low-cost steppers... >> $300 for a 200-250mm/sec printer with only-slightly-higher-cost steppers... >> >> a 2x or greater speed improvement for only a 1.5x cost... that's an >> opportunity i can't ignore >> >> >>> >>>> MGN9C rails so that the problems associated with rods go away. >>>> triple lead screws (i might consider quadruple) on the printbed, NO >>>> CANTILEVERING. >>> >>> You're a madman. You sure like to over-engineer things, don't you? :) >> >> no, i simply like to properly and comprehensively assess all six >> degrees of freedom, which i am honestly constantly amazed that 3d >> printer designers don't do, and i like to properly and i do _mean_ >> properly research what the best mechanical options are. but... that's >> taken me about... 2-3 years to do (!) >> >> >>>> well, here's the thing: i actually quite like trying out things that >>>> other people aren't doing. but also taking calculated risks. >>> >>> Sounds like you've already got your mind made up. >> >> i've got an _approach_ (an assessment criteria) where my mind's made >> up, but nothing else. the one thing that i might add is "risk". as >> in it would *really* piss me off to have a chain of improvements that, >> at the end of the design process, there's something i missed which >> made the whole exercise totally frickin useless. >> >> i had that happen once before. not a huge fan of it happening again :) >> >>> I'm not here to tell you >>> what to do. I'm just sharing my experience and what worked for me. >> >> appreciated. >> >>> Like >>> many technical problems, it's all about the approach. There are as many >>> different approaches as there are engineers and business men. You know what >>> is ultimately best for your situation. If it were me in your shoes though >>> .. well, I'd never put myself in that position again, haha. Nope, one and >>> done, thank you very much. >> >> :) >> >>> Any of my future products I make will be CNC >>> machined, laser cut, or injection molded, and then outsourced. As long as >>> it's a durable product, it's not really any worse than the energy expended >>> to setup a printer farm. >> >> yehh we're not quite at the medium-volume phase yet, i don't want >> 10,000 people dropping by the forum expecting "user support" on "how >> to compile and patch linux kernel drivers" >> >> >>> >>> ...annd from your previous-previous email, I forgot to reply to this little >>> bit: >>> >>>> love it. well let's get you on the list for a pre-production prototype >>>> ok? >>> >>> Yea, hook a brother up. The pre-production is the A20 >> >> yes. >> >>> or is it the older >>> one? Are there any basic breakout boards or dev boards for it to plug into? >> >> yeah i have a breakout board PCB done (one component - the PCMCIA >> socket) and am also planning to get early devs a microdesktop as well. >> >>> If you need an address or anything like that just let me know. >> >> later. i just need numbers initially. >> >> l. >> >> _______________________________________________ >> arm-netbook mailing list [email protected] >> http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook >> Send large attachments to [email protected] >> > > _______________________________________________ > arm-netbook mailing list [email protected] > http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook > Send large attachments to [email protected] _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
