QuoteJGR destroyer2012 Wrote: ------------------------------------------------------- > Maybe you could even chemically coat the inside of > a stainless steel thermal break with teflon in > exactly the same process used to coat stainless > cooking pans. That would be the best design. already looked into it, the cost is a little crazy That's a pity Teflon coated SS would be the peby RP Iron Man - General
Oh dear... are you saying that you bought the Prusa I2 kit from Mixshop? If so, then you are probably facing the same problems that I faced about a year ago when I first got into RepRap. I found that the Mixshop guys are helpful but their prusa i2 kit is not the greatest. I talked about the problems I experienced with it in this thread. Most of the problems that I had with the Mixshop Prusa Iby RP Iron Man - General
What makes PTFE so special is the fact that it has VERY low friction, low thermal conductivity, and can withstand relatively high temperatures (enough for ABS extrusion). It has all of the necessary characteristics of a hot end insulator. Hot end developers have yet to find a material that is a more effective than PTFE in this regard. The only time PTFE is not used in hot end design is when weby RP Iron Man - General
It could also be that the pot on your y motor driver is turned too low and you are skipping a few steps each time, though this seems unlikely given that you have a perfect rectangle. As the people above have mentioned: be sure to check your firmware, g-code, belts, and pulleys, Ericby RP Iron Man - General
@nic0laz Quotenic0laz If you are going to talk about the designers with those words, then, come up with a design, if not, just shut up and go play with your spacecrap. I must say, while cozmicray did not question the design in the most civilized way, this response did not help the misunderstanding in any way whatsoever. Even if you think someone is being unreasonable on the forums, please do noby RP Iron Man - General
@knowbusiness No problem It's best if everyone understands the basics of hot end development so that people can judge designs according to their theoretical functionality rather than aesthetics/hype. This was a huge problem when Jo released his original PrusaNozzle which had some serious design flaws but happened to look beautiful and was of course made by the designer of the Prusa Mendel! Maby RP Iron Man - General
You need to make sure that the fans are NOT blowing over the transition zone (short SS constriction between the heat block and the heat sink). It is essential that there is some sort of transition zone or else you may end up pulling liquid plastic into the "cold-side" on retractions. When this happens, the liquid plastic will cool in the cold side and form a plug and therefore jamming the hot endby RP Iron Man - General
@Xabbax Well done Your design looks like a very accessible way to build a DIY water-cooled hot end. Keep up the good work! @cozmicray Quotecozmicray No I haven't designed a 3D printer hot end but I have been involved in a lot of designs for spacecraft Keeping hot things from getting cold, keeping cold things from getting hot Isolation and insolation is the key Preventing heat flow in or outby RP Iron Man - General
Quotebobc Perhaps, for reference it would be useful to include an Open Source Hardware definition. QuoteTraumflug The possible reasons why this definition doesn't work for everyone is exactly the topic here. Calling everything which doesn't match these criteria "closed source" or "not open" is a vast oversimplification, because you can't really call published sources "closed". Doing this simplifby RP Iron Man - General
@MattMoses QuoteMattMoses You have this completely backwards. Developers come to RepRap to get ideas, advice, free technical support, and more. When "people in RepRap" lose their "morals/direction" they don't stick around. Because they're too busy putting together their Kickstarter campaign and running their new company. You seem to missing half of the picture. Yes, developers come to RepRapby RP Iron Man - General
@MattMoses QuoteMattMoses So, trying to decide between NC or not NC for a hardware design is kind of a moot point - it doesn't matter either way because the CC license doesn't have any "legal teeth" when it comes to protecting the functional aspects of a hardware design. I thought this was obvious so I did not think to mention it. As Traumflug already stated, any copy shop can go ahead and sellby RP Iron Man - General
@bobc I have been following along with this thread and I have to say that I agree with Traumflug and strongly disagree with what you just said. First of all, I do not see how an NC clause is NOT Open Source. Think about the words: "Open Source" for a second. Open Source precisely describes a project where the "source" (ie. drawings, code, etc...) is "open" (ie. published in a place that is easiby RP Iron Man - General
Ok, that sounds quite reliable and safe. BTW, I was exaggerating about finding puddles of melted ABS parts While ABS won't turn to liquid at 100C, if you pass it's glass transition temp (about 105C) it will get soft and will be much more susceptible to deformation due to printer movements. I wouldn't go above 80C just to be safe. Besides, if you can get the chamber temp up to 80C you definitelyby RP Iron Man - General
That is a very interesting idea and if the "slosh" caused by the carriage/platform moving through the CO2 gas does not result in too much heat loss then it could be very promising. Have you actually tested this in practice? If so, I would be very interested to hear the detailed results of your experiment As for the patent issue. I believe the "heated build chamber" is patented by Stratasys, butby RP Iron Man - General
hdp160 is right. If I can get my makeshift chamber to 40C using just a 200W heat bed that is not even always on, imagine what would happen if your temp sensor for your 1400W heater stopped working Your chamber would probably top 100C and you would find puddles of molten ABS parts around your printer! Ericby RP Iron Man - General
That cabinet looks great! The only problem with having a wooden cabinet with foil lining is that you can't see through the walls However, you seem to have a viewing window at the front and if you put a lamp inside then visibility should not be a problem. Also, wood has slightly lower thermal conductivity than PMMA so that may positively contribute to heat retention. Ericby RP Iron Man - General
It looks like heat treated tool steel may be the way to go. I wonder, are HSS drill bits made from heat treated tool steel? Ericby RP Iron Man - General
Hello Werner, kudos on the innovative delta printer development. The BerryBot 3d is truly a masterpiece of engineering ingenuity Please excuse my ignorance, but I was wondering if the the BerryBot 3d is open source? Is there a place where I could find a BOM and assembly instructions to build one of these myself? Better yet, are you planing on selling kits in the near future. If so I would beby RP Iron Man - General
It seems like Jo solved the problem of an uncontrolled transition zone by adding that heat sink. However, while the MKII version is likely a reliable hot end, I get the feeling that you are paying 90+ USD for hot end with very similar capability and performance as the 60USD E3D hot end... The advantage that I see is that there is no junction within the melt zone where plastic can fill and causeby RP Iron Man - General
Yeah, IGUS bearings are very expensive, but your alternative approach seems like a good way to go. Ok, if you are looking at printing IGUS style linear bearings then you can check out this thing. This IGUS imitation is well designed and prints quite well. Just make sure that you have a well calibrated printer with a hot end that doesn't clog easily as there will be about half a hundred retractiby RP Iron Man - General
Yvan is right about the difference between the machinability and surface hardness of metals. From my experience and from what I have heard from others on the forum, precision chrome plated steel rods are the only type of linear rails that can effectively be used long term with linear bearings. Both mild steel and SS are not hard enough and wear as a result of the repeated point loads of the lineaby RP Iron Man - General
I also have my build area only heated by my heat bed. With a clear garbage bag wrapped around my Prusa I2 I can reach 40C while printing ABS. The advantage of using a clear garbage bag is that I still have a pretty clear view of what is going on inside the chamber while printing. I think the best way to do this would be to have a box with a hinged door constructed entirely out of 1/8" (~3mm)by RP Iron Man - General
Wow, that is very interesting. The LEDs are wired with resistors in the LED strips so it's understandable that the heat produced by those resistors would contribute to the warping of the steel sheet. I image that this LED strip would draw a lot of power. How do you plan on controlling the power supplied to this LED strip? Ericby RP Iron Man - General
That sounds like an effective and cheap alternative to using a fridge or oven as a heated build chamber. However, wouldn't it be very inefficient to use LED strips to heat the chamber? LEDs are fairly efficient at producing light so even though they do product some heat, most of the energy they consume is converted into light energy which would be useless for your application. An alternative woby RP Iron Man - General
I also have a kuehling carriage and I had trouble mounting the fan duct. I managed to fit it underneath the 8mm smooth rods pointing to the front of the printer, but it was a few mm lower than it should have been. I had to hack away a few bits from the plastic duct but it works fine now If you do this make sure that the fan does not blow on the 2mm shaved portion of the ss insulator as this wilby RP Iron Man - General
I am not sure about the "new industry standard" as there have always been 2 definitions of 3mm filament (3mm +/-, and 2.85 +/-). I presume that they are trying to establish 3mm filament as strictly "less than 3mm". I have used 2.85mm ABS with my 3mm version of the E3D hot end and it works just fine. However, you should anticipate greater backpressure due to the reduced nominal filament diameter.by RP Iron Man - General
I would be very interested to hear what you have in mind I agree with your diagnosis of the problem with groove mount hot ends. The groove mount plate has to be very tight and its thickness has to be very accurate for it to work effectively. I am also in the process of designing an all-metal hot end and I just ended up using basic groove mounting partly out of convention but also because it isby RP Iron Man - General
It definitely seems like the bearings have poor tolerances. However, you mentioned that the rod diameter measures +/- 0.02mm which is an incorrect tolerance for smooth rods. All smooth rods used as linear rails are supposed to have a tolerance of +0 mm/ -x mm where x is the lower deviation tolerance. The key here is that the actual diameter is never larger than the rated diameter of the rod as thby RP Iron Man - General
Hey Yvan, that's definitely an idea, but I am not really doing this to make a ton of profit. In fact, I was only going to order these heat beds for you and Couby (and AVRkire if he is still interested) to help you guys out with your printers. It takes too much of my time to order these heaters from my manufacturer and get them shipped out that it really isn't the best way to make money. Also, thiby RP Iron Man - General
Hey guys, AVRkire still hasn't responded so I am going to try PMing him to see if he is still interested. I hope he still is interested as ordering 4 heaters is a very small order Last call. If anyone else is interested in a custom silicone rubber heat bed please let me know ASAP. Ericby RP Iron Man - General