On 27 April 2017 at 15:23, Luke Kenneth Casson Leighton <[email protected]> wrote:
> On Thu, Apr 27, 2017 at 1:00 PM, Christian Kellermann > <[email protected]> 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 > > 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. > this 3d printer looks ok, can you update on quality when available?
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