I keep my printer in my garage, and in the winter time at cold temps (around 10C), the thermistors fluctuate wildly (between about 4C-15C) until the bed or extruder start heating up. Once the get to about 15C-20C, the thermistors start reporting stable values. However, this causes the MINTEMP thresholds to get triggered so my printer disconnects from Octoprint. I'd like to avoid setting my MINTEby jemenake - Firmware - Marlin
I totally forgot that G33 did the delta radius. My mind recorded it as being mostly for the tower angles. I’ll give that a try and see what it says. Unfortunately, I don’t have height adjustments for the bed (never seen such a thing for a delta, so I’ll have to Google that, too)by jemenake - Firmware - Marlin
The explanation for this is a little complicated. I've been tweaking my Kossel delta printers, and I've become rather obsessed with getting the settings for the DELTA_RADIUS and DELTA_DIAGONAL_ROD values exactly right. If these values are incorrect, you will get strange things like dimensional inaccuracy (where a 20mm calibration cube will be, say, 22mm or 18mm wide) or cupping (where the effectby jemenake - Firmware - Marlin
As I recall, the values deduced by G33 were very close to what I started with (like within a mm), but I'll double-check. I guess the thing that confuses me now is it sounds like you're suggesting the G33 will give you M665 numbers which don't match the physical dimensions of your printer in the interest of getting the effector to maintain a constant height off of the bed, but my understanding waby jemenake - Delta Machines
Pretty sure it's not that. The plot thickens. I actually have two of these Kossels, and I loaded the same firmware on both, but the rod lengths are a little different between the two (but I've configured them both for their own rod lengths). I tried the same calibration cube on the 2nd one, and it printed almost perfectly.by jemenake - Delta Machines
I'm rebuilding a Folgertech mini Kossel delta, and I've got it pretty much working, but my calibration cube is the wrong size. I've got Marlin 2.0.7.2 on it. I've used G33 to fine-tune the delta parameters and I don't have any cupping (so the head stays the same distance above the bed as I traverse in X and Y), I've run UBL to generate a mesh, and I was able to print a calibration cube and it loby jemenake - Delta Machines
Executive summary: Does someone sell (or offer schematics for) a device to test/adjust stepper drivers? I’ve got several that I suspect are defective, because, when I plug them into my 2-in-1 Arduino/RAMPS board, the light (which is normally always-in) comes on for a second or two and goes out. It scares the heck out of me because I’ve already fried two Arduinos and on 2-in-1, so I don’t dare leby jemenake - Stepper Motors, Servo Motors, DC Motors
I've managed to fry two MEGAs (with two different RAMPS boards in two different printers, actually, but the symptoms are identical). The Arduino (and the LCD) can no longer be powered through the RAMPS. It only comes alive if I plug it into USB. If I use USB, it seems to behave more or less correctly (shows up as a serial port on my computer, I can upload code, I can connect with PrintRun/Pronteby jemenake - RAMPS Electronics
#facepalm Wow. Now I feel like an idiot.by jemenake - Firmware - Marlin
I've got a delta printer, and I've got Marlin 1.18 working on it. Seems to be okay, but I've printed a calibration cube with it and it's a little off (20x20mm comes out to about 20.0x19.6mm). I suspect that my steps-per-mm on the carriages might be off (most likely due to some stretching of the belt). What I'd like to do is tell Marlin to traverse one of the steppers by a certain distance or steby jemenake - Firmware - Marlin
Oh, wow... now that I've played with it, it looks like the auto-calibration adjusts for a lot more than just those values. Looks like it figures out differences in the end-stops, too.by jemenake - Firmware - Marlin
While experimenting with the Universal Bed Leveling with a Z probe and wrestling with getting the delta radius set right, it dawned on me that it should be possible to deduce these from any of the mesh-style z-probing systems. The current Marlin delta auto-calibration may actually do the following, but I don't suspect so. I'll describe it here, and maybe someone can tell me how the current auto-cby jemenake - Firmware - Marlin
Found the problem. One of the wires to the extruder stepper motor got pinched enough to sever all of the strands. Soldered it, and it works fine, now. In case someone else comes across this thread in their troubleshooting search, another thing I tried was using "M203 E" to lower the feed rate just in case I was trying to drive the motor too fast.by jemenake - RAMPS Electronics
I'm in the configuration stages of a Folgertech Kossel 2020 using a RAMPS board (1.3 or 1.4, I'm not sure). I've got the X, Y, and Z extruders working fine, and I can load a gcode file and the extruder seems to make all of the right movements except the extruder doesn't advance the filament. Whether I try a normal print job, or manually send a "G1 E15", or use Printrun/Pronterface' "Extrude" buttby jemenake - RAMPS Electronics