How would we go about testing for a resistive short on the board? What would cause something like that? Thanks, Ryanby HSRepProject - General
We are using the thermistor from digi key When the extruder board is not powered up, the software reads T:0, but when the extruder board is turned on, even if the thermistor is unplugged, the software flashes back and forth between T: 231 T: 232 and T: 233. We are so close to being finished, any help would be greatly appreciated!! -Ryanby HSRepProject - General
Hello, we are having a problem with our extruder shutting off when it reaches the proper temperature. So far we believe it is the firmware, but none of us have any programming experience. If anyone has gotten their firmware to work with a thermistor and is familiar with the programming, we would really appreciate it you could take a look at our firmware and point out what we are doing wrong. If yby HSRepProject - General
We purchased the techzone generation 3 boards, and the seem to be working with one exception. The extruder controller seems to be ignoring the thermistor. The extruder gets more than hot enough to melt the ABS plastic, but it does not shut the heater down when it reaches the proper temperature. In addition, when we power up the extruder board, the temperature reading goes from T: 0 to T: 231-232,by HSRepProject - General
We tried running our extruder again with our new thermistor, and new Kapton tape. We are still using fiberglass insulated wire from makerbot. Aside from a little smoke, we thought everything was working fine, but then after around 60 seconds, we noticed large globs of melted goop around the extruder. There are pictures at the links below. In addition we checked to make sure the controller switchby HSRepProject - General
We have figured out that part of the problem was the heater wire touching itself, we have fixed that and the wire still melts right through the kapton tape. We are using the techzone boards. The extruder controller was giving 12 volts DC and 1.7amps DC to the nichrome wire. We are using a 6ohm length of nichrome wire. We have tried bare wire surrounded by Kapton tape, and the fiberglass insulatedby HSRepProject - General
We tried using the fiberglass insulated wire from makerbot, as well as bare nichrome wire and wire wrapped in kapton, and the same thing still happened. Would the amount of Kapton tape wrapped around the extruder make a difference?by HSRepProject - General
We received our fiberglass insulated wire from makerbot, and it still began to smoke when we ran the machine. We also tried wrapping our old wire in kapton tape, and the same thing happened, it looks like we actually burned through the kapton tape, we recorded a temperature of 90C using an infrared thermometer and kapton is not supposed to melt until 260C according to makerbot. After about 10 secby HSRepProject - General
Well, we just put together another extruder, and we had the same problem as with the exposed nichrome to the air. We think the problem might be that the wire we are using is not insulated, and also possibly of low quality. We're going to try and order some insulated wire off of makerbot and try that. If we're still having problems after that, we'll post here again.by HSRepProject - General
So, we got our extruder's firmware working, and our thermistor appears to be working properly, and the stepper motor is running as it should, but the nichrome doesn't appear to be heating up. We checked the voltage as the reprap was running and the nichrome is getting about 12v We tried connecting a 6 olm length of nichrome into the controller and it glowed a majestic shade of orange and put ofby HSRepProject - General
Pressing the reset button after starting the upload worked to get the firmware loaded on. Thanks everyone for the help.by HSRepProject - General
We are attempting to upload the reprap firmware to the extruder controller using the adruino program. However, we keep getting the same error. avrdude: stk500_getsync() : not in sync: resp=0x00 avrdude: stk500_disable() : expect=0x14, resp=0x51 We walked through some of the recommended troubleshooting measures from the arduino's website, but we are still having the same issue. We have it set tby HSRepProject - General
Hello, We are still having problems getting our stepper motors to work. We have had some luck adjusting the torque, but they only spin in one direction from the xyz tab in the software. We are using the TechZone electronics and Kysan NEMA 17 motors. Thanks, Ryanby HSRepProject - General
Thank you for the advice mccoyn. We are using the techzone remix electronics set. We have tried running the bad motor on a driver we know to be good, and the same twitching occurred. We are currently running the motors with only the gear attached. The belts have been removed. Thanks, Ryanby HSRepProject - General
Good morning, We began installing the belts and final wiring on our RepRap system today. We went to test the motors, only to have them twitch back and forth. We are using the Kysan motors, the same ones you can get from Makerbot. We used a Dremel tool with a grinding stone to flatten the shafts of the steppers. This is necessary to fit the printed gears onto the motors. At least two of the onesby HSRepProject - General
Hello, We are a small three person team with the goal of building a RepRap Mendel for a class project. We are very new to the project would greatly appreciate any help you would be willing to offer. If anyone has a set of printed parts or electronic components they might be willing to part with, it would be incredibly helpful. Thank You, HSRepProject.by HSRepProject - Reprappers