... someone printed objects from chocolate with a heated syringe on a fab@home-printer. It's not so complicated, but you have to adjust the temperature and extruding time very precise. With my chocolate-moulding i noticed that the melting- and recrystallization-parameters of different chocolades vary in different manors, so you have to change the parameters for every piece separately ... Viktoby VDX - Plastic Extruder Working Group
Hi Forrest, my CNC-mill draws about 1,2 kW I think an optimized faster and milling-capable reprap would draw between 100 and 500 Watts, so a 'farm' of 10 or more repraps in continuous mode and with all supporting equipment would be in the medium kilowatt-ramge too. AFAIK some machining workshops around with 5 to 10 machines spend some thousand Euros per month for electricity and such, so thisby VDX - General
... i can remember a discussion in last year about repstrapping repraps and parallelizing the fabbing capability for speedup. The point was to build as many repraps, as you have place in your basement and then let the 'overcounted' run with specific tasks continuously. So you can make all parts you wants for you and for replacing breakdowns in your 'reprap-farm' and in background 'grows' a stocby VDX - General
... sometimes i have to repopulate SMD-PCB's manually - it's no problem for passive components with two to four pins with a fine soldering bit. For desoldering SMD-IC's i use a 50-microns-sheet of steel as blade for cutting through the melted solder, so i release pin after pin. By the way - here: - a photo of two pneumatic dispensers - left the small one is for soldering-paste, the big one isby VDX - Controllers
Hi all, here: - you can see what's possible with a lathe and simplest tools *** Edit: - or metal-forming in the plane: Maybe an idea for housings or other usefull parts ... should be possible with thermoplastic-sheets too! Viktorby VDX - General
... actually most active reprappers are battling to optimize the fabbing process or their mechanics. Then there is the time-cost-relation: - when you need some days continuous fabbing to make all the parts, then this would mean someone has to spend some weeks to months of his (mostly spare) time to make a second kit and every breakdown or failure would elongate this task ... My guess is that thby VDX - General
... here an example of inherent scarcity which wasn't intended: For the last birthday of my older son i moulded some "Han Solo in Carbonite"-chocolate-bars (look here: ) as giveaways. I didn't mention to give them some value, as it was only a sweety and they were a bit remelted (smoothed at the edges) as we were out and the choc-bars were some hours in the sun ... When i last asked the parentby VDX - General
Hi Ru, the idea with personalized fabbing materials isn't meant to stop someone of copying the design - i think it's not possible, because any halfway capable person can reconstruct (or simple scan and/or resample/reshape) any RP-object, if he/she wants to. It's more to allow a 'value-added' service - e.g. better/stabler material, special fabbing- or tempering-conditions, so the parts last longby VDX - General
Hi Ru, ... any actual watermarking of image- or 3D-data is based on super-fine displacement of color-vaues or 3D-coordinates in a specific area, so the encoding-algorhythmus can extract this offset from the byte-stream. With simply refiltering or resizing of your file this displacements are resampled and intermixed with random noise, so it's useless when someone skilled wants to vialate your prby VDX - General
... the core idea is the possibility to experiment with different (simulated) electronic circuits, modules or even microcontrollers without soldering or holding a big stock of different IC's. It's not intended for the common user, but for developing and switching between different concepts and solutions - simple reload your configuration, change your motors/encoders and you can drive a completeby VDX - Controllers
... the speed isn't the only thing to watch: - 'serious' milling is mostly performed with lower speeds (<3000rpm), thicker mills (6mm - 120mm! diameter) and therefore much sturdier frames ... On the other side stands HSC (HighSpeedCutting) - here you have speeds above 50.000rpm (until 200.000rpm!) so the mechanical system could be flimsier or lighter. With a milling-repstrap you have to seleby VDX - Controllers
Hi Noz, ... for a milling head you should use a much faster DC-motor - my millhead has 11.000 to 25.000 rpm compared to 300 to 600 with a stepper! Use a dremel for first tests, but when you want to do serious milling with the repstrap, you should use motors/millheads with better bearings and more then 20.000 rpm - ye more rpm's, the lower are the applied forces for the frame ... Viktorby VDX - Controllers
... OK, the dust could be cement or such ... did it smell? I have a small probe of "Karger keramische Verguby VDX - Plastic Extruder Working Group
Hi sid, ... if it's a white mud-like paste, then this could simply be a mixture of waterglass with ceramic dust and some additives for better stability. So when i'll find some more time at home, i'll reactivate my experimentes with waterglass ... Viktorby VDX - Plastic Extruder Working Group
Hi Noz, ... why not simply use steppers? - common, reliable, precise, powerfull ... and not so expensive ... Viktorby VDX - General
Hi Andy, ... didn't find it in english - here the german link with the BOM: And here the ordering site with costs (complete kit nearly 100 Euros): Viktor *** Edit: the SMD-parts are already pre-soldered in the kit ...by VDX - Controllers
Hi Matthias, ... it's the same as with barbeque-paint what's Forrest used: Viktorby VDX - Plastic Extruder Working Group
... or individually fabbed shoes - a 3D-scanner and a reprap is the heart of any possible individualized RP-service ... Viktorby VDX - General
... as mentioned in the other PTFE-thread, i made moulds with a high-temp 2K-silikone. With a shortcut to another discussion about virtual stone (made from sand and epoxy) i would say that a perfect replacement for concrete (because of the brittleness) and/or PTFE (because of poor thermal stability) would be a compound of sand and this 2K-silikone. This silikone is good for 350by VDX - Plastic Extruder Working Group
... in our local tool-store i found some high-temp 2K-silicone-rubber for mould-making (look here: ) This stuff is good for 350by VDX - Plastic Extruder Working Group
... look here: - Isel changed some years ago to CAN-systems (what i personally didn't appreciate ) I have an old (nearly 20 years) stepper-controller with 70V/8A so with the right motors enough torque for driving heavier mechanics too. But with changing from full-/half-step to microstepping (until 1/256) i could drive with my 'small' 3A/2Nm-steppers even bigger loads, as usually performed withby VDX - General
... my idea was a split way: -'solderfree' developing on FPGA with simulating discreet IC's and modules, so when ready, the shematics could be published - so the 'normal' user could solder his PCB's as published ... The other direction is 'playing' with new concepts and technologies which can be transferred into the design - here the promise of solderfree 'evolvable' electronics was the point ..by VDX - Controllers
... ich seh's locker und versuch eher Tips/Hinweise fby VDX - Schwarzes Brett
... 2 to 4 hrs settling-time, 24 to 72 hrs full curing ... If with heating the settling-time could be reduced to some minutes, then this could be a good resin for fabbing at room-temp and curing with a IR-tube. Viktorby VDX - Mechanics
... i was thinking in the direction of 'solder-free' developing of PCB's and all sorts of discrete electronics. I have some developing-boards of 8051- and PIC-microcontrollers lying around and a handfull of 'radio-stamps' (30x30mm PCB with an C8051F330 processor and a 2,44GHz-modem on board: ) With the stamps i can build and simulate any hardware, AD/DA, SPI, I2C or other interfaces or discretby VDX - Controllers
... hmm ... maybe good for finishing brittle or delicate surfaces? How's the price and the settling time? Viktorby VDX - Mechanics
Hi Matthias, ... beim Granulat-Hersteller kby VDX - Altes Forum
Hi Matthias, ... 4mm scheinen die Regel zu sein: Die bieten zwar an, Kunststoff fby VDX - Altes Forum
Hi sid, i didn't have them in stock - but when we have some specific dimensions, i think i'll get them in bulk with a special price ... Viktorby VDX - Mechanics