On April 27, 2017 9:23:40 AM EDT, Luke Kenneth Casson Leighton <l...@lkcl.net> wrote: >On Thu, Apr 27, 2017 at 1:00 PM, Christian Kellermann ><ck...@pestilenz.org> wrote: > >> As the current issue is time in producing them I would also scratch >> the printed parts order myself, maybe in exchange for a discount on >> future designs done by Luke and print them myself. People with access >> to a maker lab could consider doing the same... >> >> I am not capable to promise good quality printing for 3rd parties as >I >> have been starting getting into this for a rather short while now... > > well, a 200x200 basic reprap will do the job, with a 0.4mm nozzle and >a layer height of between 0.15 and 0.2mm is absolutely fine. it's not >hugely difficult. i've just ordered this ($140!!) 3D printer from a >taobao seller, it's arriving in a couple of days: > > https://world.taobao.com/item/526287577504.htm
Here's a thought, if you're okay running a fleet of printers, what if we crowd funded a fleet of 3d printers, whereby people pay for printers, you do a bulk order of printers, use them to print the parts and then distribute the printers to backers. Sort of like a promotional thing, you can receive one of the printers that was used to make your laptop. > >now, at $140 i am quite happy to get up to 10 of those (if the first >one checks out fine) - it looks *really* sturdy: 20x20 aluminium >box-section: my only concern about rigidity being that it uses >L-brackets which go *into* the frame rather than triangle-corners >which are bolted outside and lock the box-section absolutely solid. >but, we'll see what happens. > > also it looks like it has a clone of the E3Dv6 hot-end (which is >really good), it has trapezoidal z-axis lead screws with proper brass >nuts, borosilicate glass plate (to be confirmed). > > the one thing i have told the guy (and he's happy to give a RMB 70 >discount): i do NOT want the f*****-s***-for-brains RAMPS 1.4 >controller. if you're familiar with 3D printing for f***'s sake STAY >AWAY from ANYTHING that uses the brain-dead "Polulu" driver "modules". >RAMPS, RUMBA, Lerdge, Megatronics - just don't f*****g well do it. > > the reason is really really simple: those QFN ICs are designed >SPECIFICALLY, as outlined CLEARLY IN THE DATASHEET, for the heat to be >dissipated THROUGH THE PCB. there is a ceramic insulator on the TOP >OF THE CHIP which ACTIVELY PREVENTS HEAT DISSIPATING THROUGH THE TOP. >if you put a heat sink on top of the chip it does... nothing. > > now, when the first reprap was created, in order to save time and >development cost they bought some PROTOTYPING boards with the stepper >drivers pre-mounted, which came with SPECIFIC instructions "under no >circumstances use these in production". > > so what happens? > > well, they (a) burn out (b) overheat (c) stop working for a couple of >seconds at a time in the middle of a print... > > ... you get the general idea. > >so anyway i ordered a Melzi 2.0 from here: > >https://www.aliexpress.com/store/group/Melzi-board/1757194_500507171.html > >and it turns out that on the reprap wiki there's a mod to them which >allows for the connection of a BT UART. it would have been handy if >those pins had been brought out on a header but hey, what's wrong with >a bit of soldering. > >if you don't want to do soldering then you can just put the Melzi 2.0 >into "auto-load" mode, drop a file in a FAT32 filesystem on a MicroSD >card and power it up. > >i like the Melzi 2. it's simple, relatively low-cost compared to some >of the other options, no-nonsense and straightforward. > >l. > >_______________________________________________ >arm-netbook mailing list arm-netbook@lists.phcomp.co.uk >http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook >Send large attachments to arm-netb...@files.phcomp.co.uk _______________________________________________ arm-netbook mailing list arm-netbook@lists.phcomp.co.uk http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to arm-netb...@files.phcomp.co.uk