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Praise, questions, complaints, etc. go here. Want to change our policy? This is where we calmly and thoughtfully discuss these matters at length.
Re: Live internet RepRap / Webcam? - 16 years ago
... it's easier/safer, to mail you the STL-files and let you work it out, then remote-fabbing. With remote-fabbing you didn't have a chance for proper stop-pause-and-restart the extruder, when something went wrong. I think a remote-reprap is more a demonstration-system and can be made through a simulated VR-reprap on the local computer better, then on a remote one over the internet ... Viktorby VDX - Reprappers
Re: RepRap can help end slave labor! - 16 years ago
Hi Wingman77, ... as aleady mentioned in other posts, i tink that an proper evolved reprap would change the situation of the people worldwide dramatically - when you can reprap all your needed hardware at home, the industry/market would break down in the areas covered by reprapping. I didn't think, the industrial complex would take it peacefully - when the companies and involved groups got awarby VDX - General
Re: McWire RepStrap Z-Stage System - 16 years ago
Hi Demented, ... for this ready-to-use part it's a good idea, but if you have to build it from scratch, then it would have some problems with accuracy and weight (iron/steel for the magnets) or you have to apply a iron-sheet for the magnetic fixing ... The idea with magnets as 1-dimensional fixing is good, but the possible holding-force is depending of the iron-sheet-thickness, so the weight ofby VDX - Mechanics
Inconsistent actualisation of the posts ... - 16 years ago
Hi Sebastien, ... i actually found an inconsistent tagging-status of the group-forums. From the main-site they didn't show the "new"-flag. When i go into a forum, it shows me all the new posts ... When on the main-site again, then the "new"-tag with the correct count is there! Viktorby VDX - Administration, Announcements, Policy
Re: First (basic) attempt at a repstrap - 16 years ago
Hi gr0k, ... i think it's no fault, to present many different ideas and concepts for repstrap and have the rrrf-shop with kits and complete sets to start. Most people not so skilled with handcrafting can buy the complete set, if someone wants to play around, he can do 'his' way. As the software is open, it's maybe more interesting to optimize the software to fit to any repstrap-system - be itby VDX - General
Re: Help with DC motors - 16 years ago
Hi Demented, ... this are good and very precise DC-gearhead-motors ... If you have to by them at the manufacturers, you pay from 50$ to 500$ (or even more, when smaller and more accurate), but when scaveaged, the price drops mostly to a fraction - i sometimes found good motors for a tenth of the original price. Or for example my 3D-CNC-system: once it was sold for nearly 12.000DM (~6.000by VDX - General
Re: buy parts in europe - 16 years ago
Hi Sean, ... after reading all Harry-Potter-books in english and some months reading and posting in the forum i'm merely comfortable with english now On the other side i have some friends in germany, which are on smilar paths with repstrapping and 3D-fabbing, but didn't stick to reprap or fab@home, as they didn't feel comfortable enough. Maybe a sort of interchanging/translating of good pointby VDX - Reprappers
Re: Future version ideas - 16 years ago
Hi augur, ... here is an article about a 'parallel scara design', whis is well suitable for high accuracy (look at figure 5) With special kinematics you can made astonishing things, but it's a very wide area ... Viktorby VDX - Reprappers
Re: First (basic) attempt at a repstrap - 16 years ago
Hi gr0k, ... for this i'm so interested in other mechanical concepts, as my much easier to replicate and assemble tripod-repstrap (look at the parts and assembling: ) or elastic/morphing structures, as tentacles and bending strouts ... It's obviously harder to control, then a 'plain orthogonal' cartesic robot, but there was some progres in the last years, so the software is on the way - and onby VDX - General
Re: buy parts in europe - 16 years ago
Hi Sean, ... the basic-forum is the very best place, to communicate and interchange ideas - i'm a bit curious about the local groups too, if it would change something or bring a sort of localisation or 'dissolving' in the community? But maybe it's a try to allow different languages in the local groups, as i know some people, which are interested in the thematics, but didn't speak and understandby VDX - Reprappers
Re: buy parts in europe - 16 years ago
Hi Kurt, ... i'm waiting too, until the 'english connection' start working and i can order the extruder-parts or some other stuff here ... If you're from germany, then you can maybe hop into the german RepRap-usergroup and post your status and interests? It seems actually, that the local groups are a bit of idling ... Viktorby VDX - Reprappers
Re: Fibre powder - 16 years ago
Hi Fernando, ... try icing shugar and starch, as said before - if the resin didn't solve it, then the stuff should do a good job ... I tried powders from plastic, glass, gold, iron, graphite, zement and sand - and some bigger sized particles like 1-100micron-glass-spheres, plastic-spheres and bigger iron-spheres too ... Laser-toner-powder (latex and graphite/bucky-balls) tend to harden and forby VDX - Polymer Working Group
Re: Furfuryl Alcohol and blocked catalyzers (formerly delivery woes...) - 16 years ago
Hi Fernando, ... for the polymer-muscles i used voltages until 2kV, much safer is the range until 60Volts, of course I think it's the balancing between current and voltage to support power-consumpting devices - with higher resistance you have to rise the voltage to get the same amount of energy through the lines without heating them ... Maybe the idea of high-frequency-AC (>50kHz) with shiby VDX - Paste Extrusion Working Group
Re: Max endstop issue - 16 years ago
Hi Reece, ... first, measure the voltage at all the pins of a 'good' endstop and then at the Z-max - this should eliminate simple supply-malfunctions ... Then try to activate the opto-switch with a thin black sheet of cartonage or plastic (paper eventually didn't work), to see, if it basically works ... And then go through the wires, to check if there's a shortcut or break anywere ... Last stby VDX - Controllers
Re: Furfuryl Alcohol and blocked catalyzers (formerly delivery woes...) - 16 years ago
... here i have some images of laser-sintered gold-paste on pads. The pads are 150 microns wide and nearly 300 microns long, the droplet of gold-paste was something between 100 and 200 microns in diameter, when wet. With 'low-energy-curing' (diode-laser at 1 Watt, 100-micron-laserspot) i dried the dexpanthenol-solvent away and then melted the gold-powder with some 3 Watts laser-power to solid.by VDX - Paste Extrusion Working Group
Re: Thoughts about creating - 16 years ago
... i think not the ability of the fabber to build possible dangerous items is in question, but the person behind, which designs and uses the produced parts ... When i was 7, we assembled small 'one-shot-handguns' from an old key, a nail, a spring (or elastic) and some strike-heads - they banged wery loud and if you made it 'wrong', then the nail could go away and do serious harm. None of the sby VDX - General
Re: Furfuryl Alcohol and blocked catalyzers (formerly delivery woes...) - 16 years ago
Hi Sean, ... for risers or vias you can insert metall-pins or silvercoated copper-vias (as used in manually assembled double-layer-pcb's) in the wet paste. Viktorby VDX - Paste Extrusion Working Group
Re: stepper motor bulk purchase - 16 years ago
Hi RoundSparrow, ... the 57BYG009-motor isn't as worthy, as the 11A in the - Look at the higher current - 2,4Amps against 1,7Amps - only half the holding-torque - 6 kg.cm against 110 N.cm - and it's only single-shafted As for the price, the 11A seems to be a better deal for me ... Viktorby VDX - Mechanics
Re: stepper motor bulk purchase - 16 years ago
Hi RoundSparrow, ... the 11A-Bipolar is stronger (~6 Volts, 1,7Amps in serial-arrangement), dual-shafted and cheaper, so it's my favorite ... Viktorby VDX - Mechanics
Re: Furfuryl Alcohol and blocked catalyzers (formerly delivery woes...) - 16 years ago
Hi Fernando, ... yes! that seems to be the ideal basis for electric circuits - touch-safe, but conducting Can you try to apply a higher current to the trays and look, if they change in resistance? Copper isn't so stable in some polymers, so after a while or with higher currents it oxidize and the conducting went poor or vanish completely ... We use a heat-curing polyimid-silver-paste, whichby VDX - Paste Extrusion Working Group
Re: Magnetic joints and selfassembling ... - 16 years ago
Hi RoundSparrow, ... with the Tripod i'll try to develop a sort of easy to assemble 'micro-reprap' with much higher accuracy, as achievable with a FDM-extruder. With the magnetic joints and the parallel kinematics i only need three linear drives as showed in my setup, six rods, two plates for fixing the drives and a third plate for the toolhead (plus some screws and glue for fixing) As the sizby VDX - Mechanics
Re: Parallel-kinematics versus string-pod - 16 years ago
Hi Howie, ... not to mismatch, the 'Seil-Tripod' was only a sketch to demonstrate wire-feeding mechanics, my actual Tipod is built with threaded rods, not with wire-feeding and the images from the other wire-driven system are from an old laserplotter, i built some years ago. Tell me, which concept is your target basis, then i can send you probably some more infos ... Viktorby VDX - Mechanics
Re: Independent Safety / Fire detection system - 16 years ago
Hi RoundSparrow, ... there should be a security-check for overheating and/or the reprap shouldn't be used unadvised! As i'm trying with laser-sintering and -cutting, i had some thoughts about removing the toxic gases too - for my testing i used a coal-absorber-filter and ventilated the fume through a tube in the garden When someone uses plastics or solvents, which exhaust toxic or even weak hby VDX - General
Re: Polar printer, assistance needed - 16 years ago
... i'm on a similar way with my converting cartesian output into moving-paths for my tripod-setup ... It's a bit trigonometric and a bit 'Bresenham' - look in the wikipedia for the linear and circular Bresenham-algorhythmus, here is sketched, how you can move two (or even more) axes on a calculated path without to much pixel-errors ... Viktorby VDX - General
Re: Whens RepRap likely to take off? - 16 years ago
Hi Brian, ... a fair conclusion and summary My path ist something between - i from time to time used 3D-mills in job and at home, actually i'm on activating an old CNC-system as 3D-mill again, so i can make milling at home too and tinker with my children in ideas, designing and fabbing freely ... And i'll tune/update the system with a paste- and FDM-extruder, so i can play with RepStraping toby VDX - General
Re: Fab Design: plastic computer case (rectangle plastic box) - 16 years ago
Hi Sean, ... every conducting surface would do, even graphite-powder in glue ... A good deal is to spray glue on the surface and press staniol/alu-foil in the glue. For interconnecting the housing-sides you have to connect the conducting areas together (maybe with stripes of conducting material too) and to ground, or the shielding wouldn't be effective ... Viktorby VDX - Reprappers
Re: Fab Design: plastic computer case (rectangle plastic box) - 16 years ago
Hi RoundSparrow, ... i can help you with the design and making STL-files - simply send me the sketches ... If you want to build bigger rectangular housings, it's maybe easier to reprap only the complex connecting and designed parts and saw/mill the housing-plates out from plastic-sheets or aluminium (EM-shieling) Viktorby VDX - Reprappers
Re: Parallel-kinematics versus string-pod - 16 years ago
Hi Howie, ... for more details of the parallel-axis tripod and a video, where i manually play the kinematics, you can go to the actual builders blog: For another stringy mechanic you can look on the drawings in my third post here: Viktorby VDX - Mechanics
Re: Reprapping Engines - 16 years ago
Hi gene hacker, ... another problem with the EBM is the vacuum you need and maybe the cost, if you weren't wealthy enough ... SLS (Selective Laser Sintering) is better fitting - i'm playing around with 1Watts- and 8Watts-diode-lasers and some metall-powders with different viscous fluids as paste, what seems to work very well. With the 8W-laser (used power ~4Watt, spotsize ~80 microns) i workedby VDX - General
Re: Whens RepRap likely to take off? - 16 years ago
... the fab@home-guys made funny electronics with embedding conductive trays in elastic polymer, cover the tray-canales with polymer too, so that's a closed sandwich-structure and then insert the electronic components through the cover ... So you have an elastic sheet, which you can bend and roll on a curved surface and you can replace blowed components, if needed. Play this a bit further, withby VDX - General