You mean like this?by TianChang - General
I suggest you give up using H-bridges unless your electronics and programming background is strong. The extra money you pay for the fourth stepper controller is cheaper than the extra time and headaches that one will usually go through. Cheers. ><by TianChang - General
Alright. Thank you very much. To Brnrd: I was actually concerned about the RepG / MB v2 firmware portion. If I hack it through D15, is it the same way the Makerbot HBP interface with the extruder controller? I saw the MB wiki docs but it wasn't too clear whether they are the same, what more I am using techzone's stuff. So I won't / will have to change the firmware? It would nice to have someby TianChang - General
Another long day at the lab. Because I have only the variable power supply and no thermistor rigged into my bed yet, i did a simple experiment with voltage and current. I printed the first layers at 19 V, 5.3 A. Then I experimented with a few lower values. 19 V 5.3 A => too high, parts shrink • 11.7 V 3.2 A => too low. Parts warps • 17.2 V 4.8 A ==> too high, Parts still shrink • 1by TianChang - General
Thanks guys. I wanted something simple so I didn't work on temperature control. Initially I thought of just lowering the voltage but since i need it to be lower after the first layer, looks like control is a must. I fried 2 out of 3 (learnt a thing about measuring currents) power transistors that is on the Gen 3 extruder board. I am left with no spares to control the bed. But I'll figure outby TianChang - General
Dear all, I have been printing parts these few days on my mendel. But something is puzzling me. As you can see from the picture, my parts are not coming out exactly the way it should be. No warping. The part never left the print bed. It stuck on VERY WELL. I had to wait minutes for it to cool before I can pop it out of the bed. 1) the vertical sides should be vertically straight. However, itby TianChang - General
Hi there, let me try: I have had this problem for a short period of time. Could it be because your layer thickness is set too small, and your flow rate / feed rate combination is too high? So there's too much plastic coming up but your extruder isn't rising the height it should be... so all that extra plastic is snagging on your extruder and pulling itself away from the print surface? Tiaby TianChang - General
Let me have a go at this: Without having the practical experience, if I am in your shoes, I think one way would be to find out would be to perform a stress-strain analysis on the desired position you want to know. Where (around which area?) and what kind of loading (tensile? Compressive? Shear?) will be exerted on this part when it is in action. At the end, you might want to think of the saby TianChang - General
Thanks a lot to everyone for their inputs @ DanielG: What changes do i need to make in the firmware if i am using a fourth stepper controller for the extruder motor and the extruder board controls the heat and temperature of the printhead?by TianChang - Reprappers
Hey Guys, My mendel have got temp sensing, heat control and working axis. The thing that is not behaving is the extruder stepper. When I turn it on and connect to my laptop, it gives out a loud whine. It moves clockwise one step (1.6V), anti clockwise one step (-0.7V) for a few seconds before coming to a stop, still whining. I am using tech zone's extruder controller board, v2.2. tech zoneby TianChang - Reprappers
Hey there Thanks. I have pretty weak electronics background so I'm being careful. Tcby TianChang - Reprappers
Hi guys, For those using Techzone Extruder boards, I have a few of questions: 1) When uploading, is one suppose to see any lights blinking away. I can see a red LED blink away on my motherboard when it is being uploaded. I have got a couple of 'done uploading' on my Extruder board, but I don't see any blinks. 2) For the 10K trimpots on Stepper Controller and Extruder, can I get a confirmatiby TianChang - Reprappers
Hello Nophead, Thanks for replying. I really appreciate it. I am having problems with only the Y axis. The rest of them I can move it well with no problems. Any other leads I can pursue for the firmware? I am not looking for full blown Instructions. Just leads or maybe configs that have worked for you guys.by TianChang - Reprappers
Hello Guys, I bought a set of 3rd Generation electronics back in May from TechZone. I have managed to get the mechanical structure of my Mendel up. Right now, I am primarily stuck at getting the electronics to work. Over the past 3 weeks, I did a lot of troubleshooting, scouring the net for information and head banging. Below is a list of points so far 1) The motherboard firmware loads fine ontby TianChang - Reprappers
I think its fine to be using material from the wiki. I just thought it is odd to be selling Mendel without pictures of the actual sale item. He has 9 of them up for sale. 【开源硬件】快速成型机 RepRap Mendal 3D打印机 (不含电脑) ==> a better translation would be : 【Hardware for Prototyping】High Speed Rapid Prototyping RepRap Mendel 3D Printer (Computer Not Included) And he didn't say anywhere that it is conby TianChang - General
==> Chinese version. It has got a equivalent Buy it now price of 5000. The whole listing uses words and pictures ripped off from the RepRap website. The seller is listed as from Guangdong, Shenzhen. It is the only lisiting. Thought I should bring it to the community's attention. Tian Changby TianChang - General
Hello, Do you have pictures to show for it? Tian Changby TianChang - For Sale
My electronics arrived. Good service. And fast email response. Tian Changby TianChang - For Sale
Note that these drawings are missing the relative dimensions. ie :: how far are the rectangle/circular holes supposed to be from the edge? I've only had time to do two. Its very tedious. Especially so because I'm did it on a eeePC netbook.by TianChang - General Mendel Topics
Hi there, I hope this will help:: You can easily generate 2D drawings from the 3D files (downloaded from the official RR wiki) using SolidWorks software. The tedious part is labelling the necessary dimensions. There was a guy who machined Mendel parts from aluminium. He made his 2D drawings available. I'm sure a search will be able to dig that up. Because I'm a mech. eng. student, my facultyby TianChang - General Mendel Topics
Hi, I am interested in making a Mendel Extruder but I am confused as to why you're offering so many different versions. Which version should I order if I want to do away with the copper jacket and fire cement? Please email me at s a r . 0 2 1 @ g m a i l . c o m Thanksby TianChang - For Sale
Thanks to Wades, i now have the trash parts in my hands. Testament to the strength of RepRap community support.by TianChang - Singapore RUG
Hey Xiang Hui, so did you manage to start on it? Tian Changby TianChang - Singapore RUG
Hi Sebastien, There's quite a lively geek/builder community down. I believe as long as I can get one started, get awareness out, more will come. =) I wont' be lone ranger here for long I hope. Tian Chang. *Wade, I replied your email.*by TianChang - Singapore RUG
Hi guys, I am a first year mechanical engineering student and I've managed to get a research institute's interest in RepRap. They do a lot of projects that require customized parts and I saw the kind of help RepRap would be for them. They've officially asked me to do a presentation for them so that they know there're dispensing funds for something that they'll use. So yes, I may get to build aby TianChang - Singapore RUG