@rexx said in Another Stratasys uPrint retrofit:
768 sst
I would say try to keep as much of it together as possible. I have been working with a more recent duet 2 wifi + Duex5 and the latest RRF 3 to take control of a Uprint SE+. The newer duets allow 5V in on the endstop inputs. The Duex5 allows for 5V logic to control the different switches and SSR on the PDB. I have gained control of everything even the dc servo motor using a Geckodrive G320x. I imagine with the 768 sst you would just need 2 G320x external drivers. I interfaced it with the CONN_LCD step dir outputs. Since there are two there, you shouldn't run into any issues. I have the Duex5 for the PWM outputs for controlling the heaters, power enable, and some logic signaling and thermistor inputs for directly reading the thermcouple 10 mv/C output from the J13 or J15 connector. To calibrate the temperature range you will need to use a voltage divider to take the 5V signal scaled down to 3.3V. Auto PID tuning worked great. I have even been able to gain control of the material bay with some soldering of wires. Still working on configuring the right pinouts to control the material bay. I'm having an issue with the fan outputs as GPIOs. I may have to find other pins, yet am quickly running out of enough pins to control everything. 5V and Vin both read in on the fans, yet the PWM pins max out at 0.5 V. I can set it to 0 and get 0V, yet it won't give me the full 5V or 24V Vin output. Not sure if I am already pulling too much from the 5V regulator or if I may have accidentally blown all of the fan mosfets. Not sure when that would have happened. I am still working on getting things calibrated and all the safety outputs run into the duet, yet once I do I'll be sure to post the whole setup here on the forum.