The latest Marlin bugfix is at 2.1 and includes MPC (Model Predictive Control) for the hot end. This is a replacement for PID, and it does an amazing job. The same gentleman who developed it also finally, really, fixed the ongoing 12 bit ADC issue.by rq3 - Firmware - Marlin
Quoteleadinglights Quotethe_digital_dentist Heatsinks normally don't get much over 60-70C. It seems unlikely that heatsink compound of any type is intended to work at hot-end temperatures,.......................................................................................... I disagree Note that I know nothing about this compound's electrical resistivity at hotend temperatures as my hoteby rq3 - General
QuoteMr Kroll Thankyou dust, It is nice to know the correct way to configure this part of Marlin. Several small adjustments to the firmware, A New BL Touch Sensor, And a few mechanical tweaks later, The machine has stabilized. ( I hate it when things don't just work smoothly) Is a Y Positive command supposed to move the build plate toward the operator during use? Yes. Positive Y is at the bacby rq3 - Firmware - Marlin
Quotethe_digital_dentist Notepad++ can compare two text files and highlights differences... But needs the "Compare" plug-in. Works as well as, or better than, WinMerge.by rq3 - General
QuoteHfleming Problem is when they have totally different power ratings, temperatures could differ by a lot. i would rather have each one on its own control circuit, i.e. 2 MOSFETs and 2 thermistors. Very true. I had made the stupid assumption that both heaters had the same resistance.by rq3 - Reprappers
Quotelabraticmp3 rq3, Thanks for making your design available. I have built one and installed it on my Anet A8 printer. I am very satisfied with the performance so far. I don’t think I am getting the performance that you get, but I think it is because of the lack of rigidity of the A8. It is much better than the other probes I have tried. Glad it's working for you. If you are using Marlin,by rq3 - Tech-Talk
Quoteobelisk79 People can be odd indeed. But often predictably so. If it says "WET PAINT", most will touch it to verify. If it says "HOT - DO NOT TOUCH", most will do the same. Removing the warning reduces the problem by at least 85%, and the other 15% get burned, painted hands. I don't know of any instance where anyone was killed or even seriously injured in either case, and they probably won'tby rq3 - General
QuoteBruce19 Hello I hope you can help here. I have a Ender 3 Pro and a SKR 1.4 Turbo I'm trying to install into my printer. BUT every time I compile in vs CODE I get the error shown in the picture. ALWAYS Even with downloading "fresh" files to use. This has been going on 3 weeks till I came here to RepRap. I hope someone can tell me what I'm doing wrong. I have no experience with firm weby rq3 - Firmware - Marlin
The worst case logic input on the TB6600 is the TQ pin, which has an absolute maximum current of 105 microamps (0.000105 amps, or 0.105 milliamps to drive it to an acceptable logic level. All of the other logic pins are even less. The 8-15 mA you refer to is what the pin protection circuit, internal to the chip, can tolerate, NOT what the pin needs to be properly driven. Any microprocessor canby rq3 - RAMPS Electronics
QuoteJaymcd0626 I have a couple of 12v heat beds laying around from tear downs/ spares and was thinking of combining a couple for a large dual bed. I have seen a number of similar questions answered previously but am still unclear the best way to do this. Any thoughts on how I can safely wire them ? I know I could just get a large silicon heater but I want to make use of some the spare parts Iby rq3 - Reprappers
Quotedekutree64 Fabulous! But I still think the posts should be machined as part of the carrier with m3 screws into the top of them to retain the bearings, to eliminate the cost and almost all the weight of the shoulder screws. Unfortunately I still haven't come up with a machining strategy to make it with my current tools and skills, so I'll probably just stick with the NEMA14 and 3D printed caby rq3 - Tech-Talk
Quotedekutree64 Quoterq3As noted above, one of the benefits of using shoulder screws is that you can very easily trim the shoulder diameter to adjust the bearing clearance. It's a one time thing during assembly. Wouldn't it be better to grind more off the cutter bearing flange? I'd rather have the bearings fit onto the posts without any wiggle room. Another way to do fine adjustment is to add shby rq3 - Tech-Talk
Quotedekutree64 Fabulous! But I still think the posts should be machined as part of the carrier with m3 screws into the top of them to retain the bearings, to eliminate the cost and almost all the weight of the shoulder screws. Unfortunately I still haven't come up with a machining strategy to make it with my current tools and skills, so I'll probably just stick with the NEMA14 and 3D printed caby rq3 - Tech-Talk
I have several 40-80 watt 880 nm CW infrared lasers kicking around, fiber coupled, and capable of pulse width modulation. Has anyone ever tried a laser heated hot end? I'm not thinking of laser melting the filament itself at the nozzle, but dumping the laser output into a very small heat block, holding just the nozzle, platinum thin film sensor, and the laser fiber. The fiber is 0.8mm in diameterby rq3 - Tech-Talk
After installing a CNC machined drive bearing carrier on my "standard" NEMA 17 stepper, and doing several prints to verify that these things can be repetitively manufactured at home, I machined a 5mm to 4mm bushing of Grade 5 titanium to adapt it to my recently acquired NEMA 11 stepper. It works just fine, at 42 grams (the motor is 28 grams, or one ounce). I haven't trimmed the stepper shaft lenby rq3 - Tech-Talk
So MarksAlot got me thinking, and it's not like I don't have some spare parts kicking around. Attached is a photo of the drive mechanism for the Rev.2 Schnekenstruder. The housing is PLA, and the drive is a 10mmx4mmx4mm shielded bearing, mounted at 15 degrees to the motor axis. Press fit into the bearing bore is a Grade 5 titanium sleeve with a knife edge half way up the bore. The knife edge wasby rq3 - Tech-Talk
QuoteMarksAlot To me, an ideal extruder would measure both diameter and travel, calculate volume dispensed, and use that to close the servo dispense loop. Thermwood does similar with their pellet extruders. They do a pressure condtrol loop with the screw, the melt then flows through a gear pump to meter/measure the flow into the nozzle, and nozzle velocity follows melt volume dispensed. We couby rq3 - Tech-Talk
QuoteMarksAlot I'm looking at something a little closer to a Uhing rolling ring drive, I've done miniature versions of the Uhing on 1/8" piano wire as a linear actuator. Somewhat more than 20 lbs of thrust. I'll have to support filament a little better if I can get it to work. I'll bet you can do this with just one bearing, with a hollow sleeve press fit into the bore. The center of the sleeveby rq3 - Tech-Talk
Quotebushpig7 "Sounds like a thermistor open circuit. It should read low resistance" it seems to me that if it was an open circuit, it would change nothing when thermistor was unplugged. i would check for a short in the thermistor or its cables I agree. Most thermistors are about 100,000 ohms at around room temperature. They DECREASE in resistance as they get HOTTER. The printer is saying it'sby rq3 - Printing
Quotecorny Alright, I restored the original printer firmware and now everything works fine again. Thanks for the help! Can you by any chance point me to GitHub Issues on the topic? I couldn't find any :/ Then I can track the issue myself and if there's a solution coming. Scroll way back and look for anything to do with PID tuning, temparature instability, etc. I believe this really became aby rq3 - Firmware - Marlin
No, it's not a Marlin PID issue, it's a change in the way Marlin makes the actual temperature measurements with the control board analog to digital converters. Bug reports have been made.by rq3 - Firmware - Marlin
This is a flaw in the later Marlin releases, and a lot of folks are seeing it. I recently installed a PT1000 platinum RTD on my hotend, and had to install an amplifier and a custom thermistor table to get Marlin to co-operate at all. As an experiment, you might try changing your P value from 21.0 to 10.0 just to see what happens. It won't hurt anything, but might make the oscillation go away, orby rq3 - Firmware - Marlin
Quotedekutree64 Ah, I'm glad I didn't bother with magnets yet then. I recommend using coarse thread screws if you're screwing into plastic. Fewer turns to take them in and out, and at least in my experience machine threads in plastic tend to wear out more quickly. I have unloaded mine once, and with some gentle turning back and forth by hand I was able to get the lumpy end of the filament througby rq3 - Tech-Talk
QuoteMarksAlot How do you go about getting sufficient grip should the filament change diameter? The schnekentruder has a knife edge drive roller that bites into the filament far enough to deal with any diameter variation. In fact, as the diameter of the filament gets smaller, the effective pitch diameter of the drive roller gets larger, so that it automatically compensates for volumetric extrusiby rq3 - Tech-Talk
Quotedekutree64 QuoteMarksAlot I've been working on a similar idea, kind of inside-out. Just have to machine a few more parts. By inside out, do you mean using an outrunner motor, or something different? I look forward to seeing it. I just finished constructing my outrunner idea that I wrote about several posts back. Check it out! Quoterq3 Thomas Sanladerer of YouTube fame just did a segment oby rq3 - Tech-Talk
Cool! There is certainly more than one way to skin a cat!by rq3 - Tech-Talk
Quoteleadinglights Hi rq3, I will have to modify my hotend to accept a diamond nozzle as all of my nozzles have M4 threaded unions, but it sounds like a modification worth using. The failure to trigger on dirty nozzles was part of why I started on this long investigation. Having two trigger points, one for a good contact and one for any contact allowed the detection of plastic on the nozzle. Itby rq3 - Tech-Talk
QuoteMarksAlot I've been working on a similar idea, kind of inside-out. Just have to machine a few more parts. Excellent! Let us know how it goes.by rq3 - Tech-Talk
Mike, after using my under-bed piezo for over a year, my experience has been that IF the nozzle is not scrupulously clean, or there is a cat hair on the bed, the M48 repeatability test in Marlin will either fail, or show an excessive standard deviation (over 3 microns). If I DO get a repeatability of 3 microns or more, it's pretty much a definitive indication that the nozzle isn't clean or thereby rq3 - Tech-Talk
Quotedekutree64 Ah, I'm glad I didn't bother with magnets yet then. I recommend using coarse thread screws if you're screwing into plastic. Fewer turns to take them in and out, and at least in my experience machine threads in plastic tend to wear out more quickly. I look forward to the results with your NEMA 11. My guess is that it will be a bit underpowered. The NEMA 14 seems just right, with eby rq3 - Tech-Talk