Hi mimarob, ... recently i read a tech-article, where someone managed to 'clean' carbonize any organic stuff as vegetables or household-droppings. He simply used a pressure-cooker filled with the vegetables, some water and citric acid as catalysator and heated this for 12 hours or so up to 120by VDX - Plastic Extruder Working Group
Hi Marcel, actually the best soure for the reprap-parts in Germany (or Europe) is When others complete their repraps/repstraps, this could change anyway ... For the lang-issue: - it's a sort of 'diplomacy' as we're on a mainly anglophone forum and most (passive) readers in the German RRUG are too ... *** Natby VDX - Schwarzes Brett
... you can use for good quality reducing high-count 3D-data and for 'skinning' dot-clouds with a surface to produce STL-data ... Viktorby VDX - 3D Scanners, Book Scanners, and Optics
Hi Demented, ... try to get an oszilloscope and then check the signals, timing and polarity and the curve-forms at the coils. Viktorby VDX - Controllers
Hi Bitman, for macroscopic dimensions it's much to slow, but when you want to build in mesoscopic dimensions (square-micrometer-sizes and accuracies), then it's worth a try. But then you need a mechanical setup in the same accuracies - submicron resolution and such ... I'm building a second setup beside my CNC-mill with 1/256-microstep-drivers, so i think to reach an accuracy in this range, buby VDX - General
Hi Lluc, ... best target for optimizing is the extruder ... Viktorby VDX - General
Hallo Daniel, typische 'gute' Motoren haben 200 Schritte pro Umdrehung und ziehen um die 2 Ampere Strom pro Phase bei 2-3 Volt Nominalspannung, du kannst dir einen RepStrap aber auch mit Motoren Aufbauen, die 'nur' knapp 1 Ampere bei 5 Volt ziehen, oder auch 0,4A bei 12 Volt, u.s.w. Schau dich bei um, ab Flanschgrby VDX - Altes Forum
... maybe Ian with 'BitsfromBytes' can serve as european link? Viktorby VDX - Mechanics
Hi Kerstin, as now it's a bit chaotic in structure, organisation and such, but maybe this is a chance too? When a project is developed to mature, it tends to 'freeze' in an optimized stage and new ideas have to fight their way through until the're common. I think we actually are in a decreasing 'brainstorming' phase, where different concepts, solutions and options are tested for usability - loby VDX - General
Hi Ru, i already mentioned using elastic magnetic stripes made from NdFeB-powder embedded in resin (see 3-rd post). But for orienting the magnetized particles in the hardening resin you need much more magnetic field than usual, as you have to overcome the high forces between the already magnetized particles to rotate them in the right direction ... Viktorby VDX - General
Hi Gene Hacker, i followed the f@h-development the last year too, but either f@h nor reprap can do the finishing - the surface-accuracy is much to coarse The best try in the actual stage would be lost-cast-moulding with fields metall or lowtemp-wax (which didn't stick to epoxy) and mould with epoxy ... Viktorby VDX - General
... here: you can download a free finite-elements-simulator for magnetic fields (for Windows). Viktorby VDX - General
... and here some nice chess-pieces, where the fabbing would be a little more complex : It's a rendered sample-scene from Povray - next i'll search a converter from POV to STL (or anoter common format) and retour and try with some other geometries and designing too ... Viktorby VDX - General
Hi Andy, ... i tried sometimes to make a paste with laser-toner from Sharp - either the toner didn't mix with the solvent, or when, then some of the ingredients thend to stick together, so the paste won't go through the needle AFAIK the toner consists mainly of latex and graphite with some additives. So you have to mix with the graphite, but shouldn't solve the latex ... Viktorby VDX - Mechanics
Hi Alex, the mirrors shouldn't focus the sunlight to much, they should better distribute the light between the tubes, otherwise the tubes would shadow each other. Tubes because of the same reason - in a big tank only the outer algaes receive the full sunlight - with tubes you have better distributing ... For the funghi: - besides of energy you need fabbing material too, so maybe it's easier anby VDX - Plastic Extruder Working Group
... there were some recent ideas to enhance the productivity of algae-growing with many communicating water+algae-filled glass-tubes surrounded by focussing solar-mirrors (similar to focussing heat for hot-water-devices) or UV-emitting lamps. For optimal results you have to arange two separate areas - one exposed to the light, another fully darkened, as most algae needs day-night-cycles ... Mayby VDX - Plastic Extruder Working Group
Hi Tim, ... instead of battling with friction, feeding-accuracy, gear-heads and such - why not build a linear-stepper as mentioned here: ? This should be much simpler to realize in respect of winding coils and step-accuracy and would solve some problems with linearisation too. Viktorby VDX - Let's design something! (I've got an idea ...)
... yes, it's my aim too adding an extruder beside the mill-head and fuse the software. So deciding for additive and/or subtractive fabbing is only to select a button on the screen Viktorby VDX - General
... update ... For a thread in another forum i disassembled the Brother-HR1-printer (see the first post in this thread) and made some photos of the linear drive. The printer (the steel-barn is the toothed stator): Toothed stator: The coils with toothed iron-cores (4 coils in a row): Viktorby VDX - General
... my youngest son (7) found the chess-pieces a bit boring too, so i designed for him a butterfly-chip: Both chips are milled from 5mm thick black POM with 2,5 mm thick white inlays from PMMA. Viktorby VDX - General
Hi mimarob, ... similar ideas with generating food-basics, energy and all sorts of ressource-materials (for building and fabbing too) from algae, bacteria or funghi are common in many SCI-FI-novelles since 50 years or so. Some clever folk made several efforts to realize this in reality too, but until now generating the needed stuff from mineral-oil was cheaper and more supported by funding andby VDX - Plastic Extruder Working Group
Hi Chris, ... it's not 'stylish' enough The paint wouldn't last long enough and a solid two-coloured set is much more impressive. So for a good reprap-reputation ( "repraprep" - maybe some more branding too ) we should make more worthy thingies ... Viktorby VDX - General
... OK, here are the images of a test with milling 'chess-chips': Layout in Corel, export as DXF (import and CAM in IsyCAM): First the inlay: Then the body: And finally assembled: ... tomorrow i have to make another in black'n'white for my other son ... Viktorby VDX - General
... look here ( ) - especially the link to the evolving 'framsticks'-beasts. Similar to the 'golem'-project there are some interesting paths, but i think framsticks have more possibilites than the golem-bots ... Viktorby VDX - General
... i should look if i have some 3D-data from 'real' chess-pieces, then you can have them converted into STL-files. Maybe i'll make a run milling the 'boring chess-chips' with my CNC-mill as some sort of intarsia in white and black POM - should look nice Viktorby VDX - General
... it's easy enough to fab cylindrical 'chips' and print appropriate images on top of them. So you have the same body for all figurines and only the image on top in a different colour and/or material would change. So maybe a two-step building: - first load white ABS and print all white parts. Then load brown or black ABS and print the black parts and the images on top of the white figurines.by VDX - General
... uh - then we have to make our own designs and cover them with ip-stuff too ? Bad thing, start going annoying and expensive too ... Viktorby VDX - General
... the problem could be the bad adhesion between metal and plastic ... First when printing metal on the surface and further when remelting for connecting the pins - it wouldn't stick to the surface and form blobs instead of neat trays ... I had an idea where you have some metal-powder or metallic salt embedded in the plastic (not so much, so it wouldn't be conducting) - then the aplied metal cby VDX - Mechanics
... meldet euch auch sonst mal, dann kommt endlich mal etwas Leben in die Bude! Wegen gby VDX - Altes Forum
Hi Daniel, ... ich bin noch dabei, mir einen RepStrap mit einer CNC-Frby VDX - Altes Forum