https://www.youtube.com/watch?v=3IGQ_8K3tGI
this is a quick video of the horribly cheap and cheerful taobao $150 plus $40 shipping 3d printer making a HELL of a racket, successfully PRINTING at 200 mm / sec. acceleration settings have been turned up to... enormous: 4000 mm / sec^2 for X and Y, and 9000 mm / sec^2 for the extruder.
in previous tests i was running at 2000 mm / sec^2 and at 120 mm / sec print speeds there was clear signs of "bulging" along the 0.7mm wide screen bezel, where at the last moment the print head would slow down *but extrusion clearly didn't*, and instead of a nice line you get this "teardrop" effect. by putting the acceleration so insanely high that artifact *DISAPPEARS*.
now, due to the bone-rattling speed the frame is clearly vibrating around, which results in this "wave" pattern as the printhead goes through this massive 180 reversal, *but*, i am amazed to find that the "wave" pattern stabilises after around 4mm and is not hugely noticeable anyway.
it's basically outperforming the mendel90 for quality, yet still matching it for speed. i'm... absolutely astounded. still to consider is putting in some acrylic / MDF / hardboard surrounds that would stiffen up the frame.
l.
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On 25 May 2017, at 1:12 PM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
https://www.youtube.com/watch?v=3IGQ_8K3tGI
this is a quick video of the horribly cheap and cheerful taobao $150 plus $40 shipping 3d printer making a HELL of a racket, successfully PRINTING at 200 mm / sec. acceleration settings have been turned up to... enormous: 4000 mm / sec^2 for X and Y, and 9000 mm / sec^2 for the extruder.
Very cool!
Would adding in a 2nd print head, in order to print two pieces concurrently, be a feasible option?
- Bluey
--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Thu, May 25, 2017 at 5:46 AM, Bluey bluey@smallfootprint.info wrote:
On 25 May 2017, at 1:12 PM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
https://www.youtube.com/watch?v=3IGQ_8K3tGI
this is a quick video of the horribly cheap and cheerful taobao $150 plus $40 shipping 3d printer making a HELL of a racket, successfully PRINTING at 200 mm / sec. acceleration settings have been turned up to... enormous: 4000 mm / sec^2 for X and Y, and 9000 mm / sec^2 for the extruder.
Very cool!
very very funny, too
Would adding in a 2nd print head, in order to print two pieces concurrently, be a feasible option?
ah. good suggestion.... except it's quite a lot of work (near-total redesign), and the x-rods would need to be up-rated to at least 10mm in order to cope with the increased span.
8mm @ 300mm long is *barely* the acceptable span for steel rods. a 2nd printhead would not only increase weight but also would require a longer span
that in turn means going to 10mm rods
that in turn means going to LM10UU bearings
that in turn means that the printhead would no longer fit into the hole down the centre, in addition to that the printhead would need to be LOWERED because the LM10UU bearings are much wider than LM8UU
the increased length and width of LM10UU bearings increasing the size of the carriage would in turn also mean that the carriage would no longer fit between the uprights
which in turn means that the uprights would need to be redesigned
and also the entire printer widened
so it is a completely unanticipated cascade of ongoing consequences meaning that a whopping 50% of the original printer needs to be replaced or redesigned.
overall it might actually be quicker - and cheaper - just to get... two unmodified printers.
:)
l.
http://hands.com/~lkcl/3dprinters/taobao_clone/taobao_clone.html
ok so i documented it as abov.
On 25 May 2017, at 3:32 PM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Thu, May 25, 2017 at 5:46 AM, Bluey bluey@smallfootprint.info wrote:
On 25 May 2017, at 1:12 PM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
https://www.youtube.com/watch?v=3IGQ_8K3tGI
this is a quick video of the horribly cheap and cheerful taobao $150 plus $40 shipping 3d printer making a HELL of a racket, successfully PRINTING at 200 mm / sec. acceleration settings have been turned up to... enormous: 4000 mm / sec^2 for X and Y, and 9000 mm / sec^2 for the extruder.
Very cool!
very very funny, too
Would adding in a 2nd print head, in order to print two pieces concurrently, be a feasible option?
ah. good suggestion.... except it's quite a lot of work (near-total redesign), and the x-rods would need to be up-rated to at least 10mm in order to cope with the increased span. ...
Ah, yeah. I was actually thinking of a bit of a bastardised printer designed just for printing the small pieces. That way, the print heads would only move left–right by the width of the largest small piece and the frame et al. could remain unchanged. (An even more crazy version would be to have four fixed printer heads mounted above a table that can move in the X and Y direction. Obviously the Z-axis mechanism would need to be rated for the higher weight resulting from the extra printer heads.)
The long pieces would still be printed on a standard one-head printer.
- Bluey
P.S. Is there any reason that PLA can’t be used in place of resin in the cast moulds? That way you get the speed of casting with the strength of PLA.
--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Thu, May 25, 2017 at 1:53 PM, Bluey bluey@smallfootprint.info wrote:
Ah, yeah. I was actually thinking of a bit of a bastardised printer designed just for printing the small pieces. That way, the print heads would only move left–right by the width of the largest small piece and the frame et al. could remain unchanged. (An even more crazy version would be to have four fixed printer heads mounted above a table that can move in the X and Y direction. Obviously the Z-axis mechanism would need to be rated for the higher weight resulting from the extra printer heads.)
ohh yeah. huh.
btw please do keep line lengths to under around 70-75 characters. see that single ">"? that should be about 6, one for each line. by using a mailer that totally fails to put in proper linebreaks i am FORCED to manually break up what you've written... but today i can't be bothered.
The long pieces would still be printed on a standard one-head printer.
i wonder if the steppers could cope with the extra weight?
- Bluey
P.S. Is there any reason that PLA can’t be used in place of resin in the cast moulds? That way you get the speed of casting with the strength of PLA.
i have no idea! very good question!
https://www.reddit.com/r/3Dprinting/comments/6de5sv/looking_for_ways_to_maxi...
ok so i asked on reddit, let's see if anyone pitches in...
On Fri, May 26, 2017 at 3:25 AM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
https://www.reddit.com/r/3Dprinting/comments/6de5sv/looking_for_ways_to_maxi...
ok so i asked on reddit, let's see if anyone pitches in...
... they did! wow! so i updated the post, and did another test part, that was at 175mm/sec on a layer height of 0.15 (nozzle is still 0.4mm) and that came out far better than i expected, too.
i'm really excited by how the quality's turning out for such a low investment. i still haven't added a nozzle fan yet! i did however stiffen up the frame somewhat with more wood-working 50mm steel corner triangles. the bracing's not perfect but seems to be having an appreciable improvement.
l.
On Sun, May 28, 2017 at 5:49 AM, Luke Kenneth Casson Leighton <lkcl@lkcl.net
wrote:
On Fri, May 26, 2017 at 3:25 AM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
looking_for_ways_to_maximise_the_mm_sec_metric/
ok so i asked on reddit, let's see if anyone pitches in...
... they did! wow!
It's a subreddit with 120k subscribers. There will be someone responding. Reddit is a trove of information, you should use it more often. The guy that you had a call with, found you via the eoma68 subreddit https://www.reddit.com/r/EOMA68/comments/6bp9an/crowd_supply_update_existent...
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--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Sun, May 28, 2017 at 11:24 AM, Bill Kontos vkontogpls@gmail.com wrote:
It's a subreddit with 120k subscribers. There will be someone responding. Reddit is a trove of information, you should use it more often.
i would have if i'd known! reddit appears to be very cooool :) and i love the mythbusters episode, especially.
l.
On Sun, May 28, 2017 at 2:03 PM, Luke Kenneth Casson Leighton <lkcl@lkcl.net
wrote:
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
i would have if i'd known! reddit appears to be very cooool :) and i love the mythbusters episode, especially.
Reddit is everything: from quality help like what you received on /r/3dprinting to annoying trolls and shitposters to funny stuff, conversations, inspiration and ideas for projects, to endless amounts of porn and completely vile stuff. There is basically a subreddit for everything a human being might think or like, some easy to find some not. I like it a lot myself because subjects are compartmentalized and easy to find what you want( and as long as you are careful not to dox yourself you can stay completely anonymous). When you ask for help on something there is usually a sweet spot on the amount of subscribers the subreddit has before your post gets buried under a ton of others and no one ever sees it. Up to 200k is usually pretty good, too small and there might be no one to help, too big and your post will be lost. For example /r/linuxhardware and /r/suggestalaptop could potentially have been of help when you were looking to buy a new laptop.
l.
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2017-05-28 4:49 GMT+02:00 Luke Kenneth Casson Leighton lkcl@lkcl.net:
On Fri, May 26, 2017 at 3:25 AM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
looking_for_ways_to_maximise_the_mm_sec_metric/
ok so i asked on reddit, let's see if anyone pitches in...
... they did! wow! so i updated the post, and did another test part, that was at 175mm/sec on a layer height of 0.15 (nozzle is still 0.4mm) and that came out far better than i expected, too.
i'm really excited by how the quality's turning out for such a low investment. i still haven't added a nozzle fan yet! i did however stiffen up the frame somewhat with more wood-working 50mm steel corner triangles. the bracing's not perfect but seems to be having an appreciable improvement.
I might have missed it but: Do you need/want other people running the finalized modification of this printer? This to parallelize and globalize the build of the laptop parts? If so is there list were you can people can sign up?
l.
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--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Mon, May 29, 2017 at 9:54 AM, mike.valk@gmail.com mike.valk@gmail.com wrote:
I might have missed it but: Do you need/want other people running the finalized modification of this printer?
that would be nice, it was one of the ideas that occurred to me.
This to parallelize and globalize the build of the laptop parts?
yes.
If so is there list were you can people can sign up?
i hadn't thought that far ahead! hmmm, let's add it to the libre laptop page for now: http://rhombus-tech.net/community_ideas/laptop_15in/casework/
l.
On Mon, May 29, 2017 at 11:39 AM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
On Mon, May 29, 2017 at 9:54 AM, mike.valk@gmail.com mike.valk@gmail.com wrote:
I might have missed it but: Do you need/want other people running the finalized modification of this printer?
that and also i would like to do an experimental design as well: http://forums.reprap.org/read.php?177,767087,770804#msg-770804
the idea is to have a double pulley arrangement which will provide balanced forces acting as far apart as possible, but also with a 4x multiplier on the force thanks to the twin pulleys.
also i plan to use double rods rather than single because double rods will turn any "twisting" (rotation) of the rods into a side-loading force against the linear rails. the further apart the rods are the more effective the leverage preventing "twisting", but they can't be too far apart else the carriage has to be too big, and also the rods have to be much longer...
... i was thinking of starting with a distance of 70mm between rod centres and seeing how that goes. should mean i can use 300mm rods.
l.
2017-05-29 17:11 GMT+02:00 Luke Kenneth Casson Leighton lkcl@lkcl.net:
On Mon, May 29, 2017 at 11:39 AM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
On Mon, May 29, 2017 at 9:54 AM, mike.valk@gmail.com mike.valk@gmail.com wrote:
I might have missed it but: Do you need/want other people running the finalized modification of this printer?
that and also i would like to do an experimental design as well: http://forums.reprap.org/read.php?177,767087,770804#msg-770804
the idea is to have a double pulley arrangement which will provide balanced forces acting as far apart as possible, but also with a 4x multiplier on the force thanks to the twin pulleys.
also i plan to use double rods rather than single because double rods will turn any "twisting" (rotation) of the rods into a side-loading force against the linear rails. the further apart the rods are the more effective the leverage preventing "twisting", but they can't be too far apart else the carriage has to be too big, and also the rods have to be much longer...
... i was thinking of starting with a distance of 70mm between rod centres and seeing how that goes. should mean i can use 300mm rods.
I remembered an post from Hackaday. http://www.doublejumpelectric.com/projects/core_xy/2014-07-15-core_xy/
l.
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On Mon, May 29, 2017 at 6:58 PM, mike.valk@gmail.com mike.valk@gmail.com wrote:
I remembered an post from Hackaday. http://www.doublejumpelectric.com/projects/core_xy/2014-07-15-core_xy/
oh wooow _that_ post, yeahh i remember reading that aages ago. learned so much since then. not least, i *really* do not like the non-coplanar aspect of that original experimental corexy design: i've seen so many people be misled into thinking that you can misalign the belts and everything will be hunky-dory.
in a corexy design the belts coming off the pulleys at the ends of the moving beam *must* be in-plane and *must* be at exactly right-angles. anything other than that is just f*****g stupid. not only do you end up with non-linear motion but the offset corner idlers (out of plane) means that the belts "ride".
the simplest way to achieve good corexy kinematics is to have the X and Y belts stacked one above the other. that also has the advantage that the belt termination points can be in the *middle* of the carriage, which, if you have dual rods (or a single linear rail) results in zero twisting of the carriage, even under high acceleration.
in the diagram shown in that post, under high acceleration one end of the belt will become slightly slack whilst the other end is under increased tension: that in turn torques the carriage which in turn places torquing (side-loading) on the rail (or rods).
the best carriage arrangement i saw was the fusebox. everything _else_ about the fusebox was questionable but the belt arrangement at least was superb.
anyway the double pulley arrangement i am going to try out will have a 4x reduction in the amount of force on the belt (traded for a 4x increase in speed, which i will have to think through the consequences of).
l.
2017-05-29 12:39 GMT+02:00 Luke Kenneth Casson Leighton lkcl@lkcl.net:
On Mon, May 29, 2017 at 9:54 AM, mike.valk@gmail.com mike.valk@gmail.com wrote:
If so is there list were you can people can sign up?
i hadn't thought that far ahead! hmmm, let's add it to the libre laptop page for now: http://rhombus-tech.net/community_ideas/laptop_15in/casework/
l.
Looks like I've been signed up ;-)
On Mon, May 29, 2017 at 7:02 PM, mike.valk@gmail.com mike.valk@gmail.com wrote:
http://rhombus-tech.net/community_ideas/laptop_15in/casework/
l.
Looks like I've been signed up ;-)
oh, errr sorry i accidentally-on-purpose forgot to mention that bit.. :)
arm-netbook@lists.phcomp.co.uk
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Luke Kenneth Casson Leighton -
mike.valk＠gmail.com