I'd be interested in a set alsoby pjr - Fisher
Looking good! My only concern is that you are potentially blocking the cable routing from the heater block to the cable tie point on the effector. The positioning of the heater block itself is important per the fisher instructions to avoid overheating the air vent nozzles and the proposed position of the IR board. I was looking at a possible mounting on the outside of the effector on the oppositby pjr - Fisher
The problem is that the Fisher nozzle is about 17-18mm below the effector so not enough clearance for the IR board underneath. I am considering adapting the nozzles part to carry a board beside the effector but it would be quite a distance from the nozzle and effector tilt will become a factor. Now if you could shave a mm or two from the board height or the nozzle could be mounted a mm or two lby pjr - Fisher
I am in the process of putting together a Mendel and I prefer to use a thermocouple for the sensor so ... I checked the Extruder controller 2.2 and there are two extra analogue pins A6 and A7 brought out to 3 pin headers with 5v and ground (next to the trimpot). I tweaked the configuration.h to use pin 6 instead of pin 3 and wired in the thermocouple board 1.0 and it works fine. Two caveats:by pjr - Controllers
Unfortunately, I think you will need to install the bootloader (I also needed to do this) - just build a parallel port cable (see for details. The Arduino 12 IDE can download the Sanguino bootloader in about 20-30 seconds or so. There's an article by Adrian Bowyer on the main blog (17 August 2008) that gives more details. Works a treat after that! Peterby pjr - Controllers
Try this - it is the 20 toothed belt gear as used in the BfB design X and Y axes. 0.125mm resolution with the standard 2.5mm pitch belt. Peterby pjr - Mechanics
Interesting. I installed x8 micro stepping drivers on my X/Y axes a couple of days ago and found (after fixing an Arduino bug that was artificially constraining the step rates) that the movement was much smoother and less noise/vibration was generated. Whether the additional precision will make a real difference is yet to be determined but the output seems 'cleaner' subjectively. Ultimately aby pjr - Plastic Extruder Working Group
My gear was actually the 20 toothed one based on the one used by the BfB designs. This means a circumference of 20 x 2.5 = 50mm and a resolution of 0.125mm with the current steppers and electronics. I am not entirely convinced by the accuracy arguments here - the belts are designed not to stretch, the flexible material of the belt will take up minor inconsistencies in the teeth and unless thereby pjr - Plastic Extruder Working Group
I think I'll quit while I'm ahead since I don't see a practical way of fabricating a useful size belt on current machines! In any case to withstand the constant flexing I suspect that polypropylene would be a better bet than ABS - I think the belts use polyurethane and nylon facings for flexibility and wear resistance. @nophead - My machine is a recent BitsFromBytes acrylic repstrap. I use theby pjr - Plastic Extruder Working Group
Inspired by nophead's successes I tried making a belt pulley based on the BitsFromBytes acrylic designs. Material is ABS, 0.5mm at 16mm/s. After a few false starts this is how it turned out: wrapping the belt ... It is not perfect but I think it would be functional. I have attached the stl file if anyone else would like to have a go Peterby pjr - Plastic Extruder Working Group
Hi, I have been experimenting with send.py which is a great utility but has a couple of small issues. First, probably because I use Windows, it ALWAYS resets the Arduino when attaching the serial port and I have found no workaround for this. This leads to the second issue which is that the sender assumes that it will receive an "ok" and nothing else after every command. This is mostly OK exceby pjr - RepRap Host