Show all posts by user
General discussions. For specific printers / electronics / fabrication methods / softwares, please see other sections.
Re: Need Help with Design Choices - Vertical or Horizontal Printing? - 7 years ago
@ Don Mclean, I'd go for the narrow but tall. As you say, very much easier to build - especially if you are considering IDEX. But, I have no experience of printing Nylon or Carbon fibre so cannot advise on layer adhesion properties with those particular filaments. I can show you a couple of examples that I've made with other filaments though. This first one is PET-G\Taulman T Glass and this oneby deckingman - General
Re: Need Help with Design Choices - Vertical or Horizontal Printing? - 7 years ago
Quotedc42 If the part will definitely be satisfactory if printed vertically, I suggest you use a delta printer. They are especially good at printing tall parts and the mechanical construction is simpler than for other types. Good point but the OP has said he want dual print heads which won't be easy on a Delta.by deckingman - General
Re: PETG eats the glassbed, what to do? - 7 years ago
Float glass and 3DLac. Borosilicate is known to easily chip but float glass does not. I use 6mm thick float glass and never had any problem with chipping or breaking. This 340 mm diameter table was printed with T-Glass\PET-G and simply fell of when the glass cooled. . Oh, and I do things like this tooby deckingman - Printing
Re: Best Chemical to Clean Hairspray off Glass Bed? - 7 years ago
I too use 3D Lac rather than hairspray and usually I don't bother with anything - just another quick squirt before the next print. Obviously, it can build up so from time to time it is necessary to give the glass a clean. One thing that works well for me is a really sharp wide chisel or gasket scraper (must be really sharp). Otherwise Acetone and paper towel works, but it's more messy.by deckingman - Reprappers
Re: Towards printer-independent GCode - 7 years ago
QuoteWesBrooks STL isn't far of a raw mesh. It's a bit of a crappy format given today's computing power, even on raspberry pies. There's no information on shared vertexes. The only information is a huge sequence three coordinate sets. Most stl object handlers that I've worked with post process the files with assumptions to try and rebuild the connectivity information. I get the impression this wby deckingman - General
Re: My extruder under/over extrudes depending on speed, even at low speeds. I'm very confused. - 7 years ago
Food for thought indeed. Not sure about motor force (or anything at the extruder end) as an accurate way to measure pressure at the nozzle. It might be OK for direct drive extruders but for Bowden tubes, and if we believe the theories behind how pressure advance works and why it's needed, there is likely to be some buckling or twisting of the filament itself that will dampen the pressure seen aby deckingman - Printing
Re: Towards printer-independent GCode - 7 years ago
Or better still, cut out the stl and feed the printer the raw meshby deckingman - General
Re: Towards printer-independent GCode - 7 years ago
Quoteobelisk79 Quotedeckingman But in each step in the progression, different technologies were employed too. To move forward, we need more than just language. Personally I think out robot controlled hot melt glue guns have just about reached the limits and are rapidly approaching the end of their life cycle. What will take it's place? ....................................... SLA, Jet Fusion,by deckingman - General
Re: My extruder under/over extrudes depending on speed, even at low speeds. I'm very confused. - 7 years ago
Quotermcniff This is an interesting problem, and one that becomes increasingly difficult to compensate for when you begin considering all of the factors to will come into play under actual printing conditions. Something else to consider here is that the extrusion speed isn't the only source of back-pressure. It also is affected by the proximity of the nozzle to print bed and/or previous layer wby deckingman - Printing
Re: Towards printer-independent GCode - 7 years ago
Quotecozmicray The progression in ink printing was dot-matrix Ink-jet Laser and greater and greater resolution Printing at the resolution of the printer not the display device Postscript was developed to provide the language for this. (first device-independent Page Description Language (PDL),) the 3D printing world needs a type of language to move forward But in each step in the progression,by deckingman - General
Re: Towards printer-independent GCode - 7 years ago
Quotedc42 Quotedeckingman Quoteobelisk79 Also, what firmware are you using? Duet - latest version. The issue I have with pressure advance is that it cleans up prints nicely when running at high speed but makes arcs jerky and curves become faceted. It's because I run a mixing hot end and use 3 or 5 extruders concurrently. Something to do with the gcode processor not being able to fill the movemby deckingman - General
Re: Towards printer-independent GCode - 7 years ago
Quoteobelisk79 Also, what firmware are you using? Duet - latest version. The issue I have with pressure advance is that it cleans up prints nicely when running at high speed but makes arcs jerky and curves become faceted. It's because I run a mixing hot end and use 3 or 5 extruders concurrently. Something to do with the gcode processor not being able to fill the movement queue as fast as the mby deckingman - General
Re: Towards printer-independent GCode - 7 years ago
Quotedc42 ........................ And then the firmware will turn it back into line segments anyway. So unless you can find a compelling reason for making gcode files smaller, it's hard to see what the benefits would be........................ Oh. I thought G2 and G3 were for doing true arcs as single moves. If the firmware chops these G2\G3 single arc move commands back into multiple small seby deckingman - General
Re: T Glass\PETG Coffee Table - 7 years ago
Quoteobelisk79 That is both Impressive and stunning. Really great print! Thanks.by deckingman - Look what I made!
Re: Towards printer-independent GCode - 7 years ago
QuoteOrigamib It seems to me that this and multiple machines are the only legitimate use for gcode files. This only affects a tiny proportion of the market though, and if we are really after changes to make first time printing easier there is other low hanging fruit to consider Quite agree. For example, I'd much rather see slicers that can generate true arc moves as supported by G2\G3 commands,by deckingman - General
Re: Towards printer-independent GCode - 7 years ago
QuoteOrigamib I have to say, am I missing something? Is slicing something people don't like doing? I find it is not an excessively annoying part of my tool chain............. All true. The only thing I can say is that with the multiple hot end options that I have (3 colour, 5 colour, 0.5mm, 0.9mm etc), I end up with a lot of duplicated gcode files which were generated from the same stl, and thby deckingman - General
Re: Towards printer-independent GCode - 7 years ago
Quotedc42 Have I missed any important information that the slicer currently needs to know about the printer? Number of extruders. I'm thinking that when I slice a multi part, 5 colour object, things don't go well when I change to my 3 colour hot end (been there, done that). Also the additional tool change commands in a multi colour gcode file would certainly play havoc if I tried to print the sby deckingman - General
Re: My extruder under/over extrudes depending on speed, even at low speeds. I'm very confused. - 7 years ago
Quotedc42 Are sure that it isn't correct extrusion at the end of the move, and under-extrusion during the rest of it? I'm positive. Good layer thickness, good layer adhesion, no gaps between lines, no valleys. Just raised ridges at the extremities (at the end of long high speed moves and unless huge amounts of pressure advance compensation are applied) . We know for sure that the amount of filby deckingman - Printing
Re: My extruder under/over extrudes depending on speed, even at low speeds. I'm very confused. - 7 years ago
Quotedc42 If we assume that the slicer is doing a good job, it's about getting the extrusion rate (i.e. mm of filament extruded per mm of head motion) to match what the slicer commanded, during all phases of the move, and irrespective of the speed the move gets executed at. Pressure advance aims to correct for under-extrusion during the acceleration segment and over-extrusion during the deceleratby deckingman - Printing
Re: My extruder under/over extrudes depending on speed, even at low speeds. I'm very confused. - 7 years ago
Isn't it about how things print rather then how an extruder behaves under static conditions? I always have to battle over extrusion at the extremities of moves when printing at high speeds which I suspect is due to pressure build up. The last thing I'd want to do is increase the extrusion multiplier.by deckingman - Printing
Re: My extruder under/over extrudes depending on speed, even at low speeds. I'm very confused. - 7 years ago
My take on it is that it takes time to melt filament. Contact surface area in the melt chamber is probably the most important thing but it still takes time for the heat to transfer from the outer surface of the filament through to the inner core because filament itself is a very poor conductor of heat. In the thread that David linked too, there is a lot of what to my mind is "theoretical twaddle"by deckingman - Printing
Re: T Glass\PETG Coffee Table - 7 years ago
Quoteo_lampe .............. Next time, I hope you have some spare spools of laywood to repeat this thing in real wood-alike look There isn't likely to be a next time - unless you fancy supplying the filament - 6 reels should cover itby deckingman - Look what I made!
T Glass\PETG Coffee Table - 7 years ago
I made this if anyone is interested Description here Video of it being printed here Ianby deckingman - Look what I made!
Re: Please help me to pick the right electronics package. - 7 years ago
QuoteDon McLean Does anyone know if I can add a single servo control to any of the previously mentioned options? I'm not talking about a servo motor to spin a belt, I'm talking about a single servo the kind you might find in a radio controlled airplane, normally used to move a rudder or elevator or aileron on a RC plane? I don't know about other boards but you can connect servos to the Duet. Yoby deckingman - General
Re: Please help me to pick the right electronics package. - 7 years ago
QuoteDon McLean dc42, really impressive machine you made, also I'm very impressed by the dual level homing from the duet. Just as a point of order, David didn't post a link to his machine so I guess you meant mine which is the dual CoreXY (see sig). I'm not easily offended though I just wanted to point it out because I'm just an end user of the Duet board and not affiliated in any way.by deckingman - General
Re: Please help me to pick the right electronics package. - 7 years ago
QuoteDon McLean ...................... Dual motors driving the Y axis, I also want to have two limit switches on one side for a homing sequence on startup to make sure the gantry is always square. I want two motors because I prefer to keep the design simple, I'd like to use Nema 17's all around, and because my gantry will weigh a bit more than the average 3D printer, so the extra torque is gooby deckingman - General
Re: Newbie looking for some setup guidance... - 7 years ago
Quotethe_digital_dentist ............................. Why aren't you using a G28 command? The G28 command will send the bed toward the switch (if you have set the motor rotation correctly), then, when it bumps the switch, it will back off a few mm and slowly go up to hit the switch again and stop. You don't have to manually write that behavior using multiple G code commands, it's part of the Gby deckingman - CoreXY Machines
Re: Plagarism in the open source field - 7 years ago
I can top that plagiarism although it's not 3D printer related. Someone in another part of the country copied a picture of one of the decks I had built from my web site and used it on their own web site. They then went on to say "This is an example of one of our decks that we built for Mrs xxxx". That's kind of bad enough but then they posted a fake testimonial from the non existent Mrs xxx sayinby deckingman - General
Re: Extruder skipping steps?
- 7 years ago
The YouTube link doesn't work but the usual cause of extruder skipping is that it's being asked to work too hard, and the usual cause of that is a blocked or partially blocked hot end or it's not getting hot enough. Did you fix that heater problem BTW? Try heating the hot end to print temperature, then send M84 to disable the extruder motor, then see if you can extrude by hand. If you can't, orby deckingman - Duet
Re: Heavy 15Kg bed + ball screws = problems with Z axis motor holding? - 7 years ago
If it's any help, I use a 59N.cm Nema 17 to lift my (approx) 8Kg bed. That's with 1mm lead screws though.by deckingman - Reprappers