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Everything about Marlin firmware : Discussions, questions, support and feature requests...
Re: DIY high temp printer build - 2 years ago
An interesting design, I will watch to see how it goes. A passing thought - It looks like the filament is stored on the right-hand side of the printer with access through a door: Having a heated chamber where the filament and printed part are held at a high temperature during printing does not mean that rolls of filament will also take the same temperature. It may be necessary to have some passiby leadinglights - General
Re: Filament measuring thingy - 2 years ago
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 search for "Dielectric pby leadinglights - General
Re: Filament measuring thingy - 2 years ago
I like the idea of the capacitive sensor although I would try it as a stack of electrode rings with the filament going through them - I may try this out as I have a bridge that goes down to the sub-picofarad region. As promised, a drawing of the filament thingy with a reference chamber and port. The measurement is made on the measurement sensor - thinner filament lets more air out and hence a weby leadinglights - General
Re: Patents - 2 years ago
One of the branches that this thread has evolved into concerns a device that I was once interested in. Instead of following this branch on this thread, I will append some thoughts on the earlier thread As far as the ethics committee goes though, I hereby swear and aver that I shall return to the true geek path of enlightenment and abjure from patents, copyrights, and other tools of oppressionby leadinglights - General
Re: Filament measuring thingy - 2 years ago
On another thread, there has been a little discussion of this idea with an emphasis on the generation of low frequencies. Although it has been several years, I think there is no particular advantage to lower frequencies but that the linearity became very poor much above a few hundred hertz. There is obviously a 'sweet spot' where acceptable linearity is obtained - my guess from earlier work is thby leadinglights - General
Re: Patents - 2 years ago
Ah! but then I can't see how a method and apparatus for the measurement of the cross-sectional area of feedstock for fused fabrication printers could be used for ends antithetical to the continued survival of the human race. This leaves me without a moral reason to continue work on it or to desist from such endeavors - perhaps I have dodged a bullet there. Mikeby leadinglights - General
Re: Patents - 2 years ago
Hi Viktor, I more or less lost interest when I found that purchased filament had be come very predicatbly round with a consistent diameter - In the past variability had pretty much been a given. If you are interested in the approach I used there is a bit more here I still have a long-throw 40mm diameter woofer which I intended to use as a driver with a piezo as a sensor, it is awaiting the rby leadinglights - General
Re: Patents - 2 years ago
It is true that patents are not always effective and can even be harmful, but almost everything else is the same: Masks are of limited effectiveness against viruses, fertilizer won't guarantee a good crop, a seatbelt is not always effective in a car crash and democratic elections won't stop you getting a bad government. The main thing about patents is that if you want money from a bank, a brotherby leadinglights - General
Re: New motion planning tricks with my CoreXYUVAB - 2 years ago
A very interesting video. It makes me want to video/document my own humble efforts. Mikeby leadinglights - Developers
Re: Patents - 2 years ago
QuoteVDX ......................................................................... -- too, to prevent companies from using/stealing the ideas ... Ditto, but now it seems a lot like shouting your ideas into the void - not even an echo can be heard. Mikeby leadinglights - General
Patents - 2 years ago
A simple question: How do the members of this forum feel about patents? My own take: In the past, when the community was arguably contributing as much or more to the FFF knowledge base than the commercial world it seemed unreasonable to take knowledge from the free interplay of ideas on the forum and fence it off as your own. As the energy has declined it now seems that any new idea you have isby leadinglights - General
Re: how can I use pins D0 and D1 - 2 years ago
Thank you both. I had been looking at a schematic of the Arduino Mega2560 which was missing the far right-hand side. The missing bit shows that PE0 and PE1 (D0 and D1) are connected to M8TXD and M8RXD on the USB MCU. EDIT: I have managed to move some ports about and have avoided having devices connected to multiple plugs so all is well. Mikeby leadinglights - RAMPS Electronics
Re: how can I use pins D0 and D1 - 2 years ago
I am not sure what you mean by "used", but there is no other physical connection tracing back to the MCU - details below. Can you give any hints on how to free them in the firmware? While I could find other pins, I would like to avoid having wires going to different connectors - AUX4 is already used for the manual controls/LCD and AUX3 is fully occupied with an SD reader, AUX2 feeds two piezo prby leadinglights - RAMPS Electronics
how can I use pins D0 and D1 - 2 years ago
I would like to use the AUX-1 connector on a RAMPS1.4 to power a device for which I will need two logic level outputs and one logic input. D57 on this connector works as expected with M42 P57 S255 setting the output high and M42 P57 S0 clearing this pin - D58 also works as expected but D0 and D1 both seem to be stuck on outputs at 5V. Firmware is Repetier 0.92.9. Any thoughts on how to use thesby leadinglights - RAMPS Electronics
Re: Two probes, Underbed for Z height and Z carriage mounted probe for leveling - 2 years ago
The latest touch probe (photograph below) is sensitive enough to detect the difference between being tapped with a clean metal bar and one with a fingerprint on the surface. I had not expected to see this kind of sensitivity, but it seems like it may be useful for finding problems like badly seated print surfaces etc. I will put some details in this forum once I have got it running in conjunctby leadinglights - Tech-Talk
Re: Logging position data during print - 2 years ago
I tend to be a bit 'old school' when faced with problems like this. Logging the step and direction inputs to the stepper motor driver(s) with a logic analyzer will get pretty close to giving you a true picture of the position. I have used a 'Saleae' logic analyzer for this purpose on X, Y, and Z motors simultaneously. Genuine Saleae analyzers are about £400 although clones are available at aboutby leadinglights - General
Re: "Form Tapping" V-slot Extrusions - 2 years ago
Just a brief note about squaring up extrusions. In the distant past, before 'T' slot extrusion was popular, my father had to make up an aluminium frame from 1" square aluminium bar. Hd did this with a hacksaw, some files, a Moore and Wright square, a test flat and some machinists blue - and most importantly, a scraper made from a modified wood chisel. This last because it is just about impossibleby leadinglights - Mechanics
Hints and tips - spring wire clips - 2 years ago
As this forum has no Hints and Tips section, Tech-Talk seemed the best place to put this - General now seemingly reserved for people with problems with their purchased (non RepRap) printers and Tech-Talk is only read by about three people, but maybe one of you will find it interesting. Spring wire clips are hardly a new way of holding parts to other parts, but it works amazingly well with 3D priby leadinglights - Tech-Talk
Re: Thingiverse taking it's last breath? - 2 years ago
There are clear cases of asking questions that have been answered many many times in the history of the forum; but having said that, I don't think that the problem is entirely with the noobs. The combination of really poor search tools in most forums, documentation (wikis, etc.) that are so outdated as to be nearly useless. In the forum some answers to oft-repeated questions so brief as to be ofby leadinglights - General
Re: Thingiverse taking it's last breath? - 2 years ago
Those that the gods would destroy they first make mad Those that the organisation would destroy they first make bad Mikeby leadinglights - General
Re: Thoughts on my design please 
- 2 years ago
The first CNC miller that I made had all 6 limit switches wired in series (they were connected as NC switches) The controller "knew" which motor it was running and in which direction. Any operation of any of the 6 limit switches except when it was homing that axis would signal an error - machining beyond the limits, broken wire or possibly a screwdriver dropped in the works. The control program fby leadinglights - CoreXY Machines
Re: Precision Piezo Z-probe Now available. - 2 years ago
5mm should be fine. If the contact point is too small then there is a risk of damaging the PZT ceramic while if it is too large much of the bending would be in theo uoter part where there is no piezoelectric material. Your design should work well but try not to let the perimeter of the bed snag on the body part of your supports - as long as there is a little clearance around the edge then a quicby leadinglights - General
Re: Kinematic systems and linear guides - 2 years ago
Sometimes the specification of the printer leads you inexorably to a particular kinematic. I was approached some months ago by somebody who wanted to 3D scan people to print full size for making lightweight armatures which would be used for making bespoke dummies for shops and other displays. The idea was to reinforce the armature with glass fiber rods and finish them off with about a 1mm layer oby leadinglights - General
Re: Kinematic systems and linear guides - 2 years ago
Quotepandaym ........... Do you have any video of that two axis bed slinger? Would like to see such a machine working. ................................ The XY mechanism being used for some light milling in The reason why I didn't want to move the hotend mechanism in At the moment it is stripped down to replace the printed gears shown in the second video as they kept breaking. Mikeby leadinglights - General
Re: Kinematic systems and linear guides - 2 years ago
Hi Pandaym, Having 3 axes working independently does intuitively seem the way to go. For myself I would rather build my next 3D printer from cast iron; filed, hand-scraped, and, if necessary, chewed into perfect flatness and squareness. The numbers however tell a different story: Many Delta printers made by happy amateurs achieve accuracy throughout the build volume not too far from the cast-ironby leadinglights - General
Two probes, Underbed for Z height and Z carriage mounted probe for leveling - 2 years ago
I am investigating a new method of probing the build stage for leveling/compensation and for the Z height of the nozzle (or nozzles). I started on this in the general section of the forum but I think that it should be in this Tech Talk section. To rehash: Underbed sensors have been used and been found reliable as long as the force at which the sensor triggers is fairly high and the sensors areby leadinglights - Tech-Talk
Re: Precision Piezo Z-probe Now available. - 2 years ago
The compliance is not enough to be called loose. There is an old posting at where I measured the deflection with a 500 gram load and got less than 40 microns. That is for a single cell and includes a little compliance for the mounting. As you will be sharing your load between 3 piezos with a simpler mounting I think the figure at the piezos will be closer to 20 microns per kilogram on the bed.by leadinglights - General
Re: Precision Piezo Z-probe Now available. - 2 years ago
For most purposes, you should use the piezo disks in radial mode even though it introduces some unwanted compliance into the system. The additional compliance is usually so little that it can be safely ignored. Compression mode does give a very rigid structure but needs greater care to get it working well. Bending in one axis can give problems with some piezos that where there can be a substantiaby leadinglights - General
Re: Report on under bed sensor problems - 2 years ago
A true luxury of questions. I will do my best to answer all of them. @Chowa, The Z-axis is not shown on the chart and the Y-axis is in ADC counts. Having said that, with a Z speed of 2mm/second the 32ms X duration covers a Z travel of 64µm. Z drive is from a 0.9° stepper driving a 1mm pitch lead screw with anti-backlash nuts. The printer is not a Delta but a slightly unusual Cartesian type wherby leadinglights - Tech-Talk
Re: Different sensors for Z height and bed leveling - 2 years ago
@DC42 O.K., it looks like I will be going 32 bit. Mikeby leadinglights - General