Quotedekutree64 Finally got around to finishing my poor man's schnekenstruder, and it actually works! At least mostly. For some reason it doesn't seem to be able to retract. Even with jerk/acceleration set very low, motor current set much too high for continuous running, and retraction distance 0.5mm, it still just makes a suffering noise and fails to rotate backward. But if I command it to rotatby rq3 - Tech-Talk
Quotemisan Hi, Have you tested that system with a movable bed? I see your claim that it is not only for delta printers but it occurs to me that the acceleration of a moving bed could trigger it too. Thanks, misan I have 3 printers, only one is a delta. The probe works fine on a moveable bed, with the sensitivity adjusted down a bit.by rq3 - General
At least on my Predator, the factory part cooling blowers are 24 volt, 0.2 amp Boosfan JD4010M, and they truly suck. They barely move air. I replaced them with Delta BFB0412HHA-A units, wired in series to just one FAN0 connector. These are 12 volt, 0.08 amp units, and are physically a drop in replacement. I use two in series electrically so that each drops 12 volts, and the pair can run off of tby rq3 - Delta Machines
Quotelabraticmp3 Quoterq3 Quotelabraticmp3 I am very interested in this sensor. Do you have the STL and Gerber files available for the under bed version? Certainly: I've been using it for over a year now, and it's still reliable and consistent. Have fun, and let us know what you think. Thanks for the quick reply, but I only find the 35mm_Nema17_Inserts.stl at the link you provided. Is the 4by rq3 - Tech-Talk
Quotelabraticmp3 I am very interested in this sensor. Do you have the STL and Gerber files available for the under bed version? Certainly: I've been using it for over a year now, and it's still reliable and consistent. Have fun, and let us know what you think.by rq3 - Tech-Talk
QuoteVDX ... there are even NEMA8 steppers - maybe with 1:3 gearing or something else? I've looked at NEMA 8 steppers, BLDC, brushed printed pancakes, even pneumatic and hydraulic motors. Once you get into gearing the weight gain is a no-go for any motor. It looks like the NEMA 11 is kind of the minimum weight "sweet spot", given other constraints like shaft diameter, torque, speed, etc. The NEby rq3 - Tech-Talk
Quoterq3 Well, this is unexpected. It turns out that the "anti-torque" mechanism for the filament is not needed. At least with PLA. The filament melting in the hot end is sufficient. Since I can't edit, I'll commit the sin of quoting myself. PETG doesn't need any anti-torque mechanism either. And I've ordered a NEMA 11 pancake stepper that weighs only 28 grams, which should bring the all-up weigby rq3 - Tech-Talk
Well, this is unexpected. It turns out that the "anti-torque" mechanism for the filament is not needed. At least with PLA. The filament melting in the hot end is sufficient.by rq3 - Tech-Talk
Very good points, Mike. I'm currently printing with the entire assembly (with my HEPA and charcoal filters inplace), and everything seems to be going swimmingly. I probably won't pursue the physics of any differences to any great degree, but file away any comments for future consideration. So far, my one major take-away from this entire series of projects is that diamond nozzles are the cat's meby rq3 - Tech-Talk
Finally all together. Marlin 2.0.9.3, platinum PT1000 hot end sensor with linearized OPA388 amplifier, modified mother board, pure silver heat block, DIY tri-metal heat break (titanium at hot end, OFHC copper at the heat sink end, 12.5 gauge 316SS hypodermic tubing through), Diamondback 0.4mm diamond nozzle, and of course, the VDE Schnekenstruder. Steps per millimeter tuned to 2360, but didn't cby rq3 - Tech-Talk
Quoteobelisk79 Quite glad to hear that you're doing better and thank you very much for the cautionary tale and sharing your experience! Thank you, Sir! Doing the first print in quite some time, with the VDE extruder (see the tech section). The HEPA and charcoal filters seems to be keeping any reaction in check.by rq3 - General
At 225C, the original aluminum block with a Marlin Type 5 thermistor sensor required about 10 watts to idle at temperature (about 0.4 amps). Under the same conditions, but with a platinum sensor, same heater cartridge, the silver block requires about 4 watts (about 0.15 amps). This I cannot explain. Mind you I'm not complaining. Never complain, never explain? Temperatures plotted with Repetierby rq3 - Tech-Talk
Quotedlang one bearing thick, but a largish bearing 10mm dia, x 4 mm tall is ~315mm^3 something 4mm dia and 25mm tall would be about the same volume (so similar mass, although bearings are not solid), but smaller diameter, so less angular momentum (i.e. easier to stop and reverse) I am NOT saying that their design is better, just that it may not be as obviously worse as first glance would haveby rq3 - Tech-Talk
I trust this will not devolve into a political diatribe regarding vaccination, as did my previous post on this topic. Kudos to the forum moderators for their diplomatic handling. However, I think a follow up is in order. Last year I developed a severe allergic reaction to 3D printing of PLA. It was eventually treated with a phenomenally expensive gene suppressing ointment, recently approved byby rq3 - General
Quotedlang Quote It's interesting that all of these have rollers that appear to be 20 or 30mm tall. If you play with 3 pencils, it becomes quickly apparent that there can be only ONE central point of contact between 3 canted rollers, which is what makes the roller positions and spacing so critical. Any roller taller than that one point of contact is just wasted space and mass. The added lengthby rq3 - Tech-Talk
I have a pretty unique piezo sensor glued under the bed of my delta printer. It works just as well with any printer architecture. The sensor has no moving parts, doesn't need to be deployed or connected at need, and works with any bed. It has no levers, springs, extending probes, or any other extraneous paraphernalia. It needs only connection to a 7-35 VDC power source, and the controller Z axisby rq3 - General
Quotedlang you mention a few posts back that you considered using a bldc, rather than re-wiring it, consider going with a smart controller like the odrive. It needs an encoder, but you don't need to go with a high resolution encoder like people normally do, as you note with 28 positions/rev you can get to 125 steps/mm, so a 7 ppr quad encoder setup (say with a copy photodiods) would be enough resby rq3 - Tech-Talk
Well, it's been interesting. I've been struggling for quite some time with both piss poor hardware and firmware. First, the hardware: My "research" printer is a grossly modified Anycubic Predator delta. About the only thing that is still stock on this machine is the motherboard, display, and power supply. The motherboard hosts an STM32F103ZE chip, but the implementation leaves a lot to be desirby rq3 - Tech-Talk
The motor data sheet is 0.9 amps. There is no harm in going lower, if the motor will provide the torque you need.by rq3 - Stepper Motors, Servo Motors, DC Motors
I have been 3D printing for years, with no issues. This spring I was working on various projects, and printing almost 24/7 from February to May, primarily in PLA, but with a very small amount of PETG, PC, and ABS thrown in. In April, I got my Covid shots (Moderna), and new eyeglasses. Three days after the second covid shot, my ears started exuding voluminous quantities of ear wax. This progresby rq3 - General
Mike, your response prompts me to try a firmware other than Marlin. I've only used Marln since it became 32 bit capable, but I'm open to suggestions. Development is done on a delta printer with Chitu 32 bit STM32F103ZETA board. Keep in mind I am NOT a programmer. Analog and mechanical design, no problem. PS: Glad to see you active again!by rq3 - Tech-Talk
Hi Mike; The schematic and board layout were done with ExpressPCB, which is a free utility that also allows almost one click ordering of boards. They also provide the gerber files. Also free is TINA, a Spice modeling utility from Texas Instruments, which will allow you to open the .TSC file in schematic form for modification and modeling. Texas Instruments also published the Excel spreadsheetby rq3 - Tech-Talk
Marlin does a miserable job with platinum resistance temperature measurements. Even after I pointed out that Marlin was still using 10 bit conversion, though all recent 32 bit boards use 12 bit AD converters, the thermistor tables are all 10 bit. You can, of course, use a Maxim RTD converter chip, which reports RTD temperatures over SPI. Or you can add an amplifier running on the same 3.3 volt sby rq3 - Tech-Talk
I believe you have to invert the run-out sensor in configuration.h: #define FIL_RUNOUT_STATE HIGH // Pin state indicating that filament is NOT present. I had to do this for my Anycubic delta.by rq3 - Firmware - Marlin
My printer use a 100K thermistor to sense the hot end temperature, and works very well. Plotting the temperature with Repetier Host shows the readings bounce a fraction of a degree. However, if I install a PT1000 sensor, and recompile with a hot end sensor of 1047, the temperature plot bounces up to +/- 20 degrees, and the temperature will not stabilize enough for the print to start. No amount oby rq3 - Firmware - Marlin
How old is the spool of filament? I have some 5 year old PLA that won't print no matter what.by rq3 - General
No harm was done. Obviously, unplugging the motor means there can be no back EMF. Any stepper driver will run quite happily while connected to a motor, or disconnected from a motor. In both cases the driver monitors its own output current, and regulates the output drive voltage to supply the requested current. BUT...what actually happens is that if you disconnect a motor WHILE it is moving or hby rq3 - General
Yes, you can. Each 470uF capacitor can be replaced by two 940 uF electrolytics in series, with either their anodes or cathodes tied together. It doesn't matter which, as long as you don't tie them anode to cathode, in which case you just get a smaller valued, higher voltage, polarized cap. If tied anode to anode, or cathode to cathode, you willl end up with a non-polarized cap of one half the capby rq3 - Experimental and Hobby
I just received my 0.4mm Diamondback Nozzle. It's a sintered diamond orifice in a standard sized brass housing. The claims for it are extreme hardness (it will never wear out), ad extreme thermal conductivity (it gets heat into the filament as rapidly as possible). Under the microscope, the flat diamond surface that "irons" the filament appears to be highly polished, and the orifice itself appeaby rq3 - Tech-Talk
Read the data sheet. If it's a real OP97 from Analog Devices, it has an operational temperature range of -55C to +125C for the military version, and +85C for the industrial version. Whether the resistors need to be matched really depends upon the intent of the circuit. General purpose low frequency gain, like an audio application, probably not. If it's amplifying, say a platinum RTD sensor and fby rq3 - Experimental and Hobby