I think it's unfortunate, but SKR 1.4 provides 3.3v instead of 5v to the drivers. The same problem occurs with A4988. I solved this by cutting the VDD pins of the drivers and soldering wires that I connected to one of the several terminals that supply 5v on the board.by ECJ - General
Quotedc42 QuoteECJ @leadinglights This laser sensor must have a small array of receivers and then the variation in the angle of the received beam to be translated as movement. But I don't think can measure speed and direction. It has a square image sensor that measures amount and direction of movement in two dimensions. Speed can be inferred from the amount of movement over time. Yes, a systemby ECJ - General
@leadinglights This laser sensor must have a small array of receivers and then the variation in the angle of the received beam to be translated as movement. But I don't think can measure speed and direction. I agree with the question of the capacitive sensor. Just to measure the presence and absence of filament, it is a good alternative since it will not suffer mechanical wear and therefore wilby ECJ - General
Quotedc42 I agree that you need to measure movement to detect extrusion issues. However, it's important to measure direction as well as movement. Otherwise, the reverse movements caused by retraction and pressure advance will cause extra movement to be recorded. Laser filament monitors work great with some types of filament but not at all with other types. We (Duet3D) used to make and sell laserby ECJ - General
Quoteleadinglights QuoteECJ ......................................................... As for the filament presence sensors, I believe that the most useful are those that are also capable of detecting movement, because if something occurs that obstructs the movement, the simplest sensors become useless. I believe that the work of creating a new sensor using capacitance detection would only be justby ECJ - General
Quoteleadinglights @ECJ I think you are right on all counts although there is still a possible place where the capacitative sensor could be used. Humidity will vary between the outer layers of a roll and the inside. The layers most exposed to the most recent humidity will reflect that. Filament quality when I made my first printer in 2011 was pretty awful but I don't think I have seen a thicknesby ECJ - General
Quoteleadinglights QuoteECJ ............................................. I believe that moisture absorbed by the material will affect the dielectric constant more than the composition itself. .............................................. Although there seem to be several strikes against a capacitive sensor for measuring how much plastic is being fed, there may be occasions where it does notby ECJ - General
Quoteleadinglights A possible problem with capacitative sensors is that the dielectric constant of PLA, ABS and other plastics may vary widely. Ways could be found around this,such as having a cell with a sample of the feedstock of a known diameter; but there would remain a quality problem as it would not account for the dielectric constant varying along the length of the roll. From Google searcby ECJ - General
Connect the sensor terminals in parallel. Thus, when either ends, detection will occur.by ECJ - General
I'm not interested in selling outside Brazil, because nobody is interested in paying more for shipping than for the product. And the end user doesn't need the diagram to install and use the sensor ... I've been commenting here just to reinforce the idea that it's possible to offer a microcontroller-based solution with very few external components. But still, thank you for your interest.by ECJ - General
QuoteMKSA How about some pictures, schematic, video in operation ? I understand you don't want to have it copied and I understand you, so no need to give the firmware. Ad where I make available for sale: Specific to Ender 3 and CR-10:by ECJ - General
Quotekarabas QuoteECJ Quotedc42 The attiny processor ADC inputs are OK with any two of high resistance source, high capacitance source, and fast changing input. The datasheet gives the ADC input resistance as 100Mohms typical and a few pF capacitance. It was what I said two years ago here in the forum (https://reprap.org/forum/read.php?1,635075,760894#msg-760894), but it seems that some did notby ECJ - General
With polycaprolactone (polymorph) could work.by ECJ - General
Quotedc42 The attiny processor ADC inputs are OK with any two of high resistance source, high capacitance source, and fast changing input. The datasheet gives the ADC input resistance as 100Mohms typical and a few pF capacitance. It was what I said two years ago here in the forum (https://reprap.org/forum/read.php?1,635075,760894#msg-760894), but it seems that some did not understand ... "DjDemoby ECJ - General
Quoteklcjr89 Quoteo_lampe When I use foam for a close gap, I use a mist water sprayer before I inject the foam. I might try this, as the casting resin is very expensive and the volume required to fill the cavity would be astronomical. Have you considered using mineral fillers in your resin? Calcite is very cheap!by ECJ - General
Quoteto-the-nth @ECJ - have you ever pulled a glass chip? No. As I said before, the parts come loose on their own after they've cooled. And with a low of 50 degrees, you can pull them with some ease.by ECJ - General
Quoteto-the-nth I love this. First thing that came to mind was 007 "Shaken, not stirred". I am fresh out of dental acrylic. 2 hour prep is a PITA, but if the result is magical, it might be worth the wait. What is the theory behind this and what kind of results are you seeing? what brand of acrylic powder? Prime? release on cooling? pulls glass chips? what brand ABS? Acrylic promotes good adby ECJ - General
Dilute 0.5 grams of "dental acrylic powder" into 15 grams of ABS juice and then tell us the result... Intructions: Add the powder on the juice and stir / shake vigorously. Let stand for 2 hours and then stir / shake again. It will be ready to use. It gives good results even on a glass table. But it should be spread on the heated desk at about 45 degrees to repel moisture that can spoil the effeby ECJ - General
It seems to me that you are extruding too much plastic causing the nozzle to bump into the part and your engine does not force enough to overcome the obstacle.by ECJ - Reprappers
Really. I see the 2 complaints as invalid. Maybe I'm a developer, I'd be wise to give my opinion. But I started to unfold with piezo disks precisely because I was dissatisfied with all other types of existing sensors. And it was the best thing I did. The sensor I used on my printer was working every day for 8 months and never failed. It does not even occur to me to use another type of sensor. Thby ECJ - General
QuoteDjDemonD My thoughts are probe at 130 deg C nozzle temp (below ooze temp) with bed fully heated to 1st layer temperature for the material you intend to print. You wont damage your bed at this temperature for the brief contact involved. The hot nozzle ensures that any residual plastic at the nozzle has minimal/no effect on your probed height. Of course you should clip it with a wire cutterby ECJ - General
Quoteleadinglights In the past many people have given reasons why piezoelectric discs would not work, most of these reasons have been shown to be false but the claim that pushing a hot nozzle against the build surface is a bad thing has never been totally dismissed. On my Cartesian printer I have the amplifier set very insensitive to combat the shaking at the end of X and Y moves. The contact preby ECJ - General
Yes, it follows an image: This is a spherical diamond tip for engraving 2mm diameter. Hole with CNC module from my printer. I fixed the disc with double-sided adhesive tape and applied a small amount of silicone oil in the place to be pierced. All this care is necessary because it is ceramic, very hard and brittle material. The hole is perfect without causing micro cracks in the ceramic.by ECJ - General
Well, I will not bother you any more. But if at some point I decide to open my project, I'll come back to this topic for sure! Good job to all and good luck!by ECJ - General
QuoteDjDemonD from the discussion about analogue electronics i.e. Leadinglights's, Moriquendi's and my implementation using an analogue PCB and ECJ's system using his digital microcontroller board. These are two separate but potentially confusing discussions. Yes! They are two distinct segments, each with its different challenges and results. It is not very pleasant to make comparisons and thatby ECJ - General
Quotedart16 OK... so I finally got around to fitting the piezo sensor to my mini kossel, replacing the servo operated optical sensor I had there for bed probing. Can I just say that you guys have the right approach as far as I am concerned... KISS. It works as described..no need to go digital or over complicate the thing.... it is perfect. If I can bludgeon a hole in the middle(ish) of a piezoby ECJ - General
Quoteleadinglights QuoteECJ At first I also considered the use of analog hardware, but I soon came to the conclusion that to get the results I want, many components would be needed. It would be more laborious and would not have the same performance and stability. As I have knowledge and ease with microcontrollers, soon I started for this solution. I got very compact hardware, inexpensive, few comby ECJ - General
At first I also considered the use of analog hardware, but I soon came to the conclusion that to get the results I want, many components would be needed. It would be more laborious and would not have the same performance and stability. As I have knowledge and ease with microcontrollers, soon I started for this solution. I got very compact hardware, inexpensive, few components, and very efficient.by ECJ - General
I mentioned EVA only to demonstrate sensor sensitivity and little pressure that it exerts on the surface during the probes. Obviously there are no EVA coated tables. But I also use this same type of sensor in plotter, cnc, laser and dispenser modules that I have in my 3D printer.by ECJ - General