We'll agree to differ. I'm happy to respect your opinion but that doesn't mean it's the correct solution for everyone, or that it is the only solution that should be adopted. Where I live, aluminium tooling plate is expensive whilst glass is cheap. I haven't seen a dented piece of glass but I've see plenty of scratched and dented pieces of aluminium that would not serve as print surfaces (evenby deckingman - Extruded Aluminum Frames
Quoterustynoob You might try adding your blog link to the top post so it is easier to find. Can't see how to edit that post. Anyone know? I've added my sig to this post which has a link. Edit. How come I can edit this post but none of the earlier ones. Is there a time limit or something?by deckingman - Developers
You can buy 8mm x 1mm lead screws (I did). Note that I use the term "lead" rather than pitch. Lead is the linear distance a nut would travel in 1 revolution, pitch is the distance between threads. With a single start screws, they happen to amount to the same thing but on multi start screws, they are completely different. IMO it's important that layer height should be a function of full steps anby deckingman - General
To expand on what DC42 has said, 35cm x 35cm x 0.4W = 490 Watts which exceeds your 350 W power supply. At 24V, 490Watts is 20.1 Amps which exceeds the 15 Amp limit that the Duet WiFi can supply. So it rather looks like your best option is to use an AC mains heater controlled via a SSR (Sold State Relay) or similar.by deckingman - Duet
DD and I like to differ about some aspects of print beds. We both agree that a rigid, flat aluminium plate is essential. We differ on the use of removable print surfaces. I prefer to use glass (on top of my 10mm thick aluminium) for the reasons DD stated (i.e different surfaces for different filaments and being able to quickly resume another print after one has finished). - Oh and I've never yetby deckingman - Extruded Aluminum Frames
No benchmark that I know of. The criteria are that the extruder needs to grip the filament firmly enough to push it through, preferably in a way that doesn't squash or grind the filament, with a motor that has sufficient torque to accomplish that without skipping steps, and to be able to retract quickly. You are right that when extruding, the speed will be limited by how fast the hot end can meltby deckingman - Reprappers
Quoteconscripted Thanks for the work you have done on this. I'm currently saving for the cyclops hotend. I can't wait to start experimenting with multi colored prints. Your post processing script looks really interesting. I saw on your blog that the script was taken down. Do you have plans to replace it? Conscripted Maybe. I haven't exactly ironed out all the bugs. It mostly works but thereby deckingman - Developers
A couple of observations. You state that non-constant acceleration is essential for smooth motion where in fact the opposite is true. That is why varying the rate of change of acceleration is called "Jerk". The term is derived from the physical effect that the third derivative has on motion. Linear acceleration is essential to smooth motion. As an example, imagine a locomotive coupled to a carriaby deckingman - General
Yeah I kind of get where you are coming from and I can see how it might be necessary on large heavy tool heads to limit the initial rate of acceleration so that the motor lag doesn't cause missed steps. S curves and so forth are used in heavy machinery with a lot of mechanical inertia - basically to slow down the command signals so that they "line up" with what the mechanics are capable of. AFAIKby deckingman - General
@DC42, David, are you saying that if you have a negative X offset for the tool of say minus 20mm and X home is zero, then when printing the head will be able to move to X-20?by deckingman - Duet
Quotetjhinton Based on my understanding, the machine tries to do an instantaneous turnaround in a move that theoretically implies infinite jerk since the rate of change in acceleration is very very high. This isn't the case IRL, but we can call this maneuver "infinite jerk" since we assume the machine is making that velocity change instantly. I stand to be corrected but I'm pretty sure that thby deckingman - General
I'm having a real hard time trying to understand what is meant by infinite jerk. In your OP you mention that it's not the firmware algorithm settings. So in basic physics we have the first derivative of position with respect to time being velocity. The second derivative is acceleration. The third derivative is the rate of change of acceleration also known variously known as jerk, jolt, lurch, orby deckingman - General
QuoteDjDemonD That's what a polyjet is correct? Okay how do we make one of those? Damm. You mean someone else has already thought of it?by deckingman - General
QuoteDjDemonD .........................Surely what we need is to be thinking like the 2D printer, multiple nozzles, even just for infill this would save a lot of time. Spray the molten plastic in tiny droplets through multiple nozzles - now your talking. Like an inkjet printer but with molten plastic instead of ink. Might need a new type of plastic though.........by deckingman - General
Why bother with any of this? It is already possible to build machines that can accurately and reliably move the print head faster than one can melt filament - even with a Volcano hot end. What is the point in building a machine capable of extreme print speeds when, because of the laws of physics you need to allow enough time for filament to melt? Just my twopence worth..........by deckingman - General
Quoteadvancedrescue QuoteTeilchen To me this looks like a straight slicer issue. Try to find a working GCode from Slimplify3D and analyze the differences with yours. I am sure a lot of people use this software on this forum. Unfortunately I don't, so I cannot help you any further... Better yet to use something like a working config for this software... I am not sure how the settings are transferrby deckingman - Duet
QuoteGad (N.B. we are plenty of "old" guys around here ) Gad I think I have the record though - DOB 16/08/1953 Can you top that?by deckingman - Developers
Hi Gad, I agree, the Diamond is big and heavy and with the 3 heat sinks set at an angle, it takes up quite a lot of space. I took a quick look at the link on thingiverse. It looks very like the Prometheus set up and there is mention of getting Cura to do the nozzle wipe off of the build platform. So I'd guess it still uses some sort of wipe/prime system between one filament and the next. Thatby deckingman - Developers
QuoteChri From my point i think the guy`s at the Ultimaker forums would be VERY interessted in this technics, because there have been sold alot of UM2`s to guy`s who wanted to upgrade their printer some time to Dual Extrusion, and it never came out, but the printer is prepaired for dual-extrusion. i´m also interessed in this thechnics for my orca, is it possible to integrate that into marlin oby deckingman - Developers
Thanks for the encouragement guys. As you can appreciate, writing up all this stuff takes a fair bit of time and I get nothing out of it apart from the knowledge that it might help others. @ Paul Wanamaker. Yes, 1200 views of this thread but only 70 visitors to the blog I set up to explain what I'm doing in detail, and only a handful of comments and followers. Hence my somewhat downbeat mood. Alby deckingman - Developers
@ Masterjuggler. Your acceleration setting looks really low compared to what I'm using - wondering if that might be the problem?. You say in your OP that they are 2,000mm/min^2 which (divided by 60) would be 33 mm/sec^2 . Or is that a typo and it should read 2,000 mm/sec^2? For info, on my heavy corexy (the Y carriage (including the x carriage) weighs in at 1,350gms and I have jerk set to 600mmby deckingman - Duet
Final update. I've fixed all the issues with the script and the technique is working very well. It seems that very few people are interested in this, so I won't bother posting any more updates here but I will keep my blog updated - at least for a little while longer.by deckingman - Developers
Quick update if anyone is interested. The issue that I reported earlier isn't anything to do with printing speed as I had suspected. To save me typing it all again, details and explanation can be found here .by deckingman - Developers
Quoteo_lampe Maybe your tool change calculation based on extruded filament is the problem and you have better results with a purge-time? You'd have to calculate how long ( in seconds, not in mm ) it takes until the new color appears. That's an interesting hypothesis but time information isn't readily available in a gcode file. It could be calculated from the extruder moves and feed rates but thby deckingman - Developers
I tried to reproduce the print in the pic and failed miserably so well done Jamesk. I thought it would be cocky to do 3 cubes, each one a different colour. It was kind of working but it's the overhangs that screw it for me. I just get a build up of filament that gets bigger and bigger until the head hits and knocks it off the bed. What size are the cubes? I made mine 40mm. This was with cheap sby deckingman - General
Yes, if my theory is right, then if the speed of filament through the extruder is constant the amount needed to purge the hot end will be constant. What I think is happening is that the melt zone effectively expands and contracts inversely proportional to speed of filament through the extruder, so the amount of filament needed to purge also changes. There is probably a time element in this as welby deckingman - Developers
I'm a long time user of the Diamond hot ends (genuine) on a couple of printers. I usually print PLA @ 195 deg C but was playing around with some t glass at 240 degC a few days ago with no problems getting up to temperature. As an aside, I did some testing on thermal compounds a while back, with a diamond sitting on some insulation (not mounted on a printer) and got up to 400 degC and probably couby deckingman - Mechanics
I've found a bit of an issue with this - probably solvable but it just adds a bit to the complexity. To save me repeating it all, there is an update hereby deckingman - Developers
QuoteFrans@France Thank you! From what I understand is that it might be worthwhile to investigate the influence of the shape of the "melting chamber" on the result? Could it be that even the entry angle of the filament into the melting chamber has an influence? Like what would happen if that entry is off-center making it whirl more? Just thinking out loud here In the case of the Diamond hotby deckingman - Developers
So as promised, herewith a link to the new blog that I have set up, in which I have created a post giving full details of my technique. The information should all be clear but if you have any questions, feel free to comment on the blog and I'll do what I can to help. Please bear in mind that I only set the site up a couple of days ago and I've gone with the free WordPress plan which means I amby deckingman - Developers