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Plastic Extruders, mostly - > http://objects.reprap.org/wiki/Extruder
Re: Dutch User Group - 16 years ago
@ Batist: Gaaf dat je een RepStrap aan het bouwen bent. Ben ook benieuwd naar jouw oplossing, omdat je een boel dingen anders hebt aangepakt. Daar kunnen interessante ideeen uitkomen. Ik ga in ieder geval je FabLab goed in de gaten houden. Misschien kunnen we je zelfs een keer uitnodigen bij Protospace in Utrecht, dat jij bijvoorbeeld je reiskosten vergoed krijgt. We gaan een keer een hele dag erby ErikDeBruijn - Dutch User Group - Archive
Re: Botten etc. - 16 years ago
CT / CAT scans zijn er genoeg, maar ik nog nog niet zomaar een archief/library met bestanden vinden. Natuurlijk zijn die er wel, maar het is vooral een kwestie van de juiste persoon benaderen. Als je op CAT scan en animal zoekt schotelt google je uiteraard alleen katten voor. Een mooie Information Retrieval casus... Paai: Als je wilt instappen met het bouwen van RepRaps op de maandagavonden, neeby ErikDeBruijn - Dutch User Group - Archive
Re: Stepper Motors - 16 years ago
I think that indeed my pulleys are bigger. I use the moulded pulleys from BfB that were initially offered. With this I need about 8 steps per milimeter. I could check the radius. I just have this impression that the positioning needs to be about an order of magnitude more detailed than the width of the filament. I will soon try to do a comparative test, since I have both 200 and 400 degree steppeby ErikDeBruijn - Mechanics
Re: Stepper Motors - 16 years ago
Skeinforge greatly improves the quality of prints by using many properties of plastics and the extrusion process. Nophead gets excellent results with his accurate off-the-shelf XY table, at metalab they get excellent results using an existing CNC machine with very high accuracy. For some time now, I have the impression that the quality of prints is currently being limited by the positioning accby ErikDeBruijn - Mechanics
Re: Wiki Media Conference: Erik talks about RepRaps! - 16 years ago
Hallo Halbe, Op dit moment heb ik geen congressen op de planning staan. Ik zal een update in deze topic posten als ik weer eens spreek. Je kunt wel eens kijken Ik was laatst als bezoeker op het Rapid Manufacturing and Mass Customization congres (van het mikrocentrum) en werd al uitgenodigd om volgend jaar te komen spreken over de RepRap. Mogelijk spreek ik ook volgend jaar weer op de conferentby ErikDeBruijn - Dutch User Group - Archive
Re: Laser Cut Parts (Bits from Bytes) - 16 years ago
If you play with reversing long enough you'll notice that you can significantly reduce the amount of oozing. It is very deterministic but the amount of extrudate will always lag behind the inserted amount of filament. These two amounts will converge because of the pressure. It would greatly help quality-wise if XY speed depended on an extrudate flow rate model. This model should use filament entby ErikDeBruijn - Mechanics
Re: Dutch User Group - I really want to build one!!! - 16 years ago
Dimitrios: The east, somewhere near Enschede perhaps? I come there every month or so. Maybe at some point we can arrange something if you're serious about this. I've built one. I'm building a few (about 5) RepRaps with a group in FabLab Utrecht on monday evenings. If traveling isn't a problem (OV?) then you could join. Please inform with me if you want to join. I will post results on my If yoby ErikDeBruijn - Dutch User Group - Archive
Re: Laser Cut Parts (Bits from Bytes) - 16 years ago
Thanks for the tips Wade. I did both, insulated the outside and increased heat conduction towards the tip. But thanks for being complete. I'm glad your original extruder works well. It's a good sign that it can be robust. Describing what your ABS does makes things more clear: mine definitely doesn't drule. I thought HDPE did this, and ABS didn't. But it seems the tip is still not hot enough. Iby ErikDeBruijn - Mechanics
Re: Laser Cut Parts (Bits from Bytes) - 16 years ago
ahan, thanks. A higher temperature helped. I have some experience with HDPE but not ABS, just that my old extruder broke under the pressure... perhaps I should've tried higher temperatures back then. I put heat conduction paste (silver paste) in the thread where the nozzle tip attaches. Maybe that also helps. I think the tip may have been about the coldest part of the extrusion mechanism. Can't bby ErikDeBruijn - Mechanics
Re: Laser Cut Parts (Bits from Bytes) - 16 years ago
After having a lot of trouble with my moulded BfB extruder, I'm having a lot of trouble with my BfB extruder. It could be because of me, of course I'd like to share this so we can discuss this and maybe fix problems you may be having and some that I'm still having. Anyway, the extruder is hard to get right. If anyone has a well working (laser-cut) extruder, please tell me what you did! My bigby ErikDeBruijn - Mechanics
Re: Super Super Firmware Optimization (giving you more free memory!) - 16 years ago
nophead. You're right. Although in the thermocouple the advantage isn't huge. The thermistor case is different. That could save at most 80 bytes. This version is 80 bytes smaller: int extruder_get_temperature() { return 1; // instead of: ( 5.0 * extruder_sample_temperature(EXTRUDER_THERMOCOUPLE_PIN) * 100.0) / 1024.0; } I estimate about 220 bytes saved with host-based temperature conversion.by ErikDeBruijn - RepRap Host
Re: Super Super Firmware Optimization (giving you more free memory!) - 16 years ago
Finding out there was newer firmware (current svn trunk), newer is not always better in every respect: Binary sketch size: 14914 bytes (of a 14336 byte maximum) Doh! What I did to make everything fit... I've made Gcodes G81-83 optional with a definition, since this takes 794 bytes and seems to be for subtractive CNC, not for additive extrusion. Is this correct? Now it would fit on a standardby ErikDeBruijn - RepRap Host
Super Super Firmware Optimization (giving you more free memory!) - 16 years ago
I've changed something very simple in the Arduino firmware (I use the GCode version, but it's probably applicable to any version). Right now, an if condition is checked at runtime to see whether measurement of the thermistor or thermocouple should be done. For those of use with the thermocouple, the code about thermistors is useless (including the lookup table of almost 200 bytes), and for thoseby ErikDeBruijn - RepRap Host
Re: Self sustaining farm - 16 years ago
About Amish: totally different. Obviously: they don't collaborate and publish their results online under an open source license. While I'm not for isolation from the rest of the world, using local resources makes you accountable. Reliability is not so much an issue here. In the Netherlands an average household has had about 16 seconds of power loss every year. Now the utilities have been furtherby ErikDeBruijn - General
Re: What Z-corp ink is made of - 16 years ago
> The binder is 1/3 Vodka? > That implies that the correct case design for a printer would be found here: ROTFLOL!!! Mark, great work. There's work on another 3D printer design with ink here: Your hint about good powder + binders will help them out, I think!by ErikDeBruijn - Powder Printing and Selective Laser Sintering
Self sustaining farm - 16 years ago
Here's a nice find! There are people working on a self-sustaining farm. They've built an open source tractor, concentrated solar power applications, their own PV panels, growing seeds, making their own flour, open source housing (Hexayurt), etc. They also develop a hydraulic press to press pretty solid bricks from earth. Those can be used for construction. Sounds like fun and they have an excelby ErikDeBruijn - General
sketch based stl! - 16 years ago
I found out about a nice website with all kinds of sketches and libraries. Sketches may sound similar to those sketches in the Arduino environment. That's because they are similar. The programming environment is about the same, but the build target is your PC instead of a microcontroller. There are even STL libraries and it sure is accessible to work with. Besides the fact that it's Dutch thereby ErikDeBruijn - RepRap Host
Wiki Media Conference: Erik talks about RepRaps! - 16 years ago
Beste Nederlandse RepRappers, Er zal op 1 november 2008 een lezing gehouden worden (door mij) over de RepRap. Als je ook geinteresseerd bent, zorg dan dat je er bij bent! Ik ga proberen mijn RepRap mee te nemen dus er is vast een boel te bespreken en bekijken! -- In English: I'll be speaking about RepRaps on 1st of November in Utrecht, the Netherlands at the Wiki Media (org behind wikipedia)by ErikDeBruijn - Dutch User Group - Archive
[video link] RepRap discussed in FabLab interview - 16 years ago
Here's a nice video. It's an interview with the founder of an Icelandic Fablab: Smari McCarthy. The interviewer is Vinay Gupta ( ) At 22 minutes it they talk about RepRap for a while. It's not a technical talk, but it's intersting to see how other DIY'ers and FabLabbers see RepRap. Besides that, it's a nice interview to watch.by ErikDeBruijn - General
Re: G-Code G02... - 16 years ago
Your milled PCB looks very good! I'm trying to get milling working with my RepRap and G-Code myself. It all seems pretty promising!by ErikDeBruijn - RepRap Host
Re: [GCode firmware] Arduino resets - 16 years ago
Hi Wade, I'm milling successfully now with G-Code!!! Thanks a lot!by ErikDeBruijn - RepRap Host
Re: [GCode firmware] Arduino resets - 16 years ago
Hi Ian, thanks for your respons. I'm using linux. I've been sending the commands from ReplicatorG and directly from the "Serial Monitor" in the Arduino environment. These are both based on the same code. Earlier I've done it with Chris Meighan's software which was made differently but also used libtxrx for the purpose. Using minicom I cannot complete a command since it uses each char I send andby ErikDeBruijn - RepRap Host
[GCode firmware] Arduino resets - 16 years ago
When I manually enter 'G1X1Y1' or something similar, I always get 'start' with the 1.3 firmware. After placing a lot of println()'s I found out that at least in the 1.2 firmware I could get it to stop resetting itself (I think it crashes). What I did wat add a string_length = sizeof(instructions); in the function and not using the 256 that's provided from the function call (sizeof the allocated wby ErikDeBruijn - RepRap Host
Yet another stepper board - 16 years ago
Here's a project I found for 3 steppers: Don't have the time to look at it right now. But I thought I'd share it for discussion...by ErikDeBruijn - Controllers
Re: Patent Infringement (Stratasys) - 16 years ago
Giving credit for a design (perhaps only by printing it and returning 'kudos') would be a reward, but it will not cost the person that prints it any more money. On the other hand, he already pays for the plastic, and has paid for the 3D printer, so a slight donation would be in place and, I can imagine, will often (enough) follow. It does have to be made easy enough to give rewards. With such aby ErikDeBruijn - General
Re: Why RepRap is failing - 16 years ago
Am I really going to defend this? If you really don't see the success that RepRap already is, then that's your problem. Enough people out there do see it, and others will follow when certain milestones are reached. The question is not why, but when. It will happen. You're mistaking RepRap's potential for failure.by ErikDeBruijn - General
Re: Why RepRap is failing - 16 years ago
> Reprap fails because the plastic parts that it can make it self cost 360 dollars to purchase. If they were mass produced they could be cheap. And a RepRap making them could do it, perhaps at a slightly higher price. But the fact is: it's a specialty item, there's no large end-market yet and the design keeps changing. So the parts ARE expensive, unless you make them the DIY way or you find aby ErikDeBruijn - General
Re: Skyglass - 2D-application for RepRap - 16 years ago
I like it too. Oh, for those of you who don't speak (read, actually) Russian:by ErikDeBruijn - Plastic Extruder Working Group
Re: What Z-corp ink is made of - 16 years ago
Wow, that plaster binding thing looks great! Perhaps we could encorporate this in a RepRap... an ink-cartridge toolhead. Then we would have: - thermoplast extruder (additive) - milling heads (subtractive) - CMM-probe (3D top surface scanning) - paste extruder (candy fabbing!) - TBD: ink-cartridge toolhead (we'll need a rod to spread the powder too...) It's getting one hell of a versatile machinby ErikDeBruijn - Powder Printing and Selective Laser Sintering
Re: New Diagnol Tie for Reduced part count and build time - 16 years ago
I started this topic earlier not because I wanted to reduce the need for threaded rods, but mostly because of the weight aspect. The machine is very heavy (I estimate 15 kg at least, but I don't have a person-scale at home). If you want to call it a desktop factory, it should be in the range of weight of an ordinary printer. Perhaps allow 5 times the weight. Now it's at least 5 times as heavy, aby ErikDeBruijn - General