MAX V3 calibration woes or am I an idiot? HA
Posted: Wed Aug 09, 2017 8:24 am
So, I decided to finally add a delta to my printer collection. I have been avoiding building one like the plague due to the bad reputation they’ve developed over the years for calibration woes.
However, seeing the HE280 in action, I figured I would give it a try and worst-case scenario I could always switch to a duet Wi-Fi setup and run their smart effector when it becomes an official release.
A Rostock MAX V3 kit was ordered.
Assembly of the machine went relatively smoothly. Followed the newest instructions as closely as possible and verified towers were square to bed with a machinist square.
I went through the initial setup process and started a 75mm disk test print, high and low spots everywhere. Ran the online delta calibration tool 3 times until it claimed an error of 0.02mm. Reprinted, there were improvements but still large differences in high and low points as well as part scaling.
Reset the firmware and went through normal calibration stages again, except, this time I ran the octoprint calibration plugin. Best results deviation 0.14mm; still have low spots in bed going towards x tower and high spots between Y and Z.
Reset firmware again.
Again, went through basic calibration. G28, G29(x3). Endstop screws were adjusted until offsets were 0, 1, 1 (within 4 as suggest by mhackney on a previous post).
This time I really paid attention to the probing points for the calibration wizard.
I very consistently get points of -.02 to 0.02 at the towers
In between every tower, the probe point is 0.39 to 0.42
Middle of the bed is usually -0.05 or so
This would mean the bed is identically high between all towers right?
I have tried multiple combinations of bed clips to see what differences there are. The results are always relatively the same.
Rod length in eeprom is stock 291.06
Horizontal radius comes out to about 144.40
Another side note is that the heat bed does not go over 82C even with power supply set to 13.44V and a ½” of cork sitting on top of it. Resistance is 1.2 ohms, which is within spec. In addition, the hotend temperature does not seem right. On my main workhorse triple C-Bot I run PETG at 250-255. On the Rostock (even after three rounds of PID tuning hotend) it seems to be extruding too hot even when set to 230.
SeeMe is sending a new heat bed and mounts after a previous conversation with them, but I want to make sure I am not overlooking something or having a “duh” moment here since I am a novice when it comes to deltas. All my other machines I have built are C/D bot variants or Cartesian
Reflective note: On extrusion, the closer to the X tower the farther the nozzle is from the bed. The farther from the X tower @ a diagonal 60 degrees or so, the closer the nozzle is to the bed until it is too thin. Saw this when printing a single layer disk w/ concentric infill that took up the entire bed. Oh and S3D for slicing. The width of the area affected by this looks like a hourglass >-< like this with the affected area being widest at the points closest and further away from the X tower. I have loosened and tightened everything on the base multiples times now so that the machine can relax into the appropriate position, re-verified squareness to bed.
However, seeing the HE280 in action, I figured I would give it a try and worst-case scenario I could always switch to a duet Wi-Fi setup and run their smart effector when it becomes an official release.
A Rostock MAX V3 kit was ordered.
Assembly of the machine went relatively smoothly. Followed the newest instructions as closely as possible and verified towers were square to bed with a machinist square.
I went through the initial setup process and started a 75mm disk test print, high and low spots everywhere. Ran the online delta calibration tool 3 times until it claimed an error of 0.02mm. Reprinted, there were improvements but still large differences in high and low points as well as part scaling.
Reset the firmware and went through normal calibration stages again, except, this time I ran the octoprint calibration plugin. Best results deviation 0.14mm; still have low spots in bed going towards x tower and high spots between Y and Z.
Reset firmware again.
Again, went through basic calibration. G28, G29(x3). Endstop screws were adjusted until offsets were 0, 1, 1 (within 4 as suggest by mhackney on a previous post).
This time I really paid attention to the probing points for the calibration wizard.
I very consistently get points of -.02 to 0.02 at the towers
In between every tower, the probe point is 0.39 to 0.42
Middle of the bed is usually -0.05 or so
This would mean the bed is identically high between all towers right?
I have tried multiple combinations of bed clips to see what differences there are. The results are always relatively the same.
Rod length in eeprom is stock 291.06
Horizontal radius comes out to about 144.40
Another side note is that the heat bed does not go over 82C even with power supply set to 13.44V and a ½” of cork sitting on top of it. Resistance is 1.2 ohms, which is within spec. In addition, the hotend temperature does not seem right. On my main workhorse triple C-Bot I run PETG at 250-255. On the Rostock (even after three rounds of PID tuning hotend) it seems to be extruding too hot even when set to 230.
SeeMe is sending a new heat bed and mounts after a previous conversation with them, but I want to make sure I am not overlooking something or having a “duh” moment here since I am a novice when it comes to deltas. All my other machines I have built are C/D bot variants or Cartesian
Reflective note: On extrusion, the closer to the X tower the farther the nozzle is from the bed. The farther from the X tower @ a diagonal 60 degrees or so, the closer the nozzle is to the bed until it is too thin. Saw this when printing a single layer disk w/ concentric infill that took up the entire bed. Oh and S3D for slicing. The width of the area affected by this looks like a hourglass >-< like this with the affected area being widest at the points closest and further away from the X tower. I have loosened and tightened everything on the base multiples times now so that the machine can relax into the appropriate position, re-verified squareness to bed.