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General discussions. For specific printers / electronics / fabrication methods / softwares, please see other sections.
Re: Below-the-knee prosthesis - 10 years ago
I have updated the repository for this - link. Report (including Laplace-domain analysis of actuator-ankle-joint complex): (There are a few shortcomings of the analysis there, but it's a starting point for controller design, simulation and evaluation at least). Presentation slides: It includes results of simple closed-loop control experiments using different controller configurations (propby dslc - Let's design something! (I've got an idea ...)
Re: Below-the-knee prosthesis - 10 years ago
Here are some photos (not all the parts are fully printed yet). That's a potentiometer mounted on the ankle joint - to provide feedback on the ankle rotation [1]. I have proportional control working but it's pretty crude (I haven't tuned the gain, for example). Ideally it would be controlled eventually by an MMG (mechanomyographic) signal. I am using a plain DC motor rather than a servo - as theby dslc - Let's design something! (I've got an idea ...)
Below-the-knee prosthesis - 10 years ago
Hi all. I am designing / prototyping a below-the-knee prosthesis for my final-year project in college. I am keeping my design repository at (It's a bit of a mess at the moment - and there is still a lot to do). The plan is for an active prosthesis with some form of human control (electromyography or mechano-myography ideally - but I'm not sure if that will be viable). I will be printing the requby dslc - Let's design something! (I've got an idea ...)
Re: [Off-topic] non- or semi-commercial engineering - 10 years ago
There might be another meeting about this next weekend. I'll try to post details here in due course - so keep an eye on this thread if you're interested.by dslc - Ireland RepRap User Group
Re: [Off-topic] non- or semi-commercial engineering - 10 years ago
Hi Huey. Meeting went ok, although things were left sort of up in the air. Anyway, there will probably be more meetings in the New Year. Send me a PM if you want to keep up to speed with what we're doing. I might not remember to post updates here. Dby dslc - Ireland RepRap User Group
Re: [Off-topic] non- or semi-commercial engineering - 10 years ago
I posted a notice about this on boards.ie a few weeks ago, and - following feedback from that - there will probably be a small meeting on Saturday afternoon in Dublin to discuss this. See post for details - on contact me privately.by dslc - Ireland RepRap User Group
Re: [Slightly off-topic] Open-source and the reciprocal economy - 11 years ago
Hi possenier. I suppose universities should run like that, but in some respects they don't. And some of the lecturers in my college would probably disagree with your perception of what universities are for. Some of them definitely wouldn't 'open-source' their notes, for example. makeme: Your points all seem reasonable. While acknowledging that money is indeed a "secondary motivation" for a lot oby dslc - General
Re: [Slightly off-topic] Open-source and the reciprocal economy - 11 years ago
Hi Bob. Hi Jasper - and John. Lots of assignments in college = very little time for Reprap or discussion -> hence the delay. Bob wrote: >> That sounds great! I would sign up. But I may have got that wrong already. I can't see where the organisation gets the money to pay me, so I guess there is more to it. I don't necessarily have the answer to this question. Maybe by posting "bounties"by dslc - General
Re: [Slightly off-topic] Open-source and the reciprocal economy - 11 years ago
bobc Wrote: > What exactly would this "semi-commercial" > organisation do? The work would be similar in content to that of other engineering organisations I suppose - but the idea isn't to dictate to people what to work on. On a wider level - if there is interest - maybe we could set up a 'non-commercial' analogue to LinkedIn - where such organisations could 'find the right people'. bobcby dslc - General
[Slightly off-topic] Open-source and the reciprocal economy - 11 years ago
Hi all, This is a follow-up to a separate discussion I started some time ago - "Wealth without money". I said that I would write again once I had a more specific proposal. While the proposal below isn't necessarily final, it is at least a little more refined. One of the main hopes here is "to strengthen the integration of the open-source movement and the reciprocal economy". I've drafted a semiby dslc - General
Re: [Slightly off-topic:] Wealth without money? - 11 years ago
HI Markus. Traumflug Wrote: ------------------------------------------------------- > QuoteI am still interested in the idea of an > engineering organisation which is focused on > designing and building for use rather than > profit. > > RepRap is such an organisation, isn't it? In a limited sense yes, but in another sense no. It's not just about open-sourcing designs. Anywayby dslc - General
Re: [Slightly off-topic:] Wealth without money? - 11 years ago
First of all: Apologies - I realize this discussion is very old and of interest to probably the minority (If moderators choose to move it I won't protest) ... To cut to the point ... I am still intrigued by this idea of 'wealth without money' (in the sense discussed above) - so I thought it might be worth trying to revive the discussion. I am still interested in the idea of an engineering organby dslc - General
Re: Screw / nut blanks for threading with tap + die - 11 years ago
Interesting to read the ideas here. I'm conscious that it probably doesn't make much sense - from an economic point of view - to fab own's one screws / threads a lot of the time (when machine screws are generally not particularly expensive). Having said that, it might be handy to print your own blanks if you need an uncommon length screw - and stuff like that. Dby dslc - General
Screw / nut blanks for threading with tap + die - 11 years ago
Just wondering ... Has anyone ever tried printing screw blanks on their Reprap - for subsequent threading with a die? Or similarly for a nut? I know that some people have tried printing actual threads directly from their printer - but my impression is that this has limited success (especially for smaller diameters / pitches). I don't have access to a tap-and-die set at present but might try thby dslc - General
Re: Gen 7 heat bed connector melted? - 11 years ago
@Terramir: Cheers. I went with the 5.08mm as per your / Traumflug's suggestion and have a safer electrical setup with 17.5 A screw terminal headers as s result. @Traumflug: You're quite right: the holes are indeed there (I'm embarassed I missed them). The only catch is that I needed to widen the diameter of the holes to accept the through-hole leads of my new headers. That was no big deal thoughby dslc - Next Wave Electronics Working Group
Re: Gen 7 heat bed connector melted? - 11 years ago
I have had the same problem with my Gen7 board and heated bed connector. I would like to replace the present headers with screw terminals, but can't find any of the correct pitch (3.96 mm). I can find screw terminals with 3.81 mm or 4 mm pitch - but not 3.96 mm. Obviously using a 4 mm pitch header in this context wouldn't be any problem, but it seems slightly perverse (and might cause problems ifby dslc - Next Wave Electronics Working Group
Re: Car exhaust putty for hotend resistor - hardening prematurely (in tub) - 11 years ago
@mars: I appreciate your advice. I think I will at least try this 'reconstituted' putty and see how it goes. If it doesn't work a new tub isn't prohibitively expensive anyway (it would just seem a shame to waste the old tub).by dslc - Reprappers
Re: Jhead MK V thermistors - 11 years ago
One more question if I may (not related to J-head hot-ends specifically) ... Is there any significant drawback to using a 200k thermistor as opposed to a 100k thermistor? (I realize that I will have to update the thermistor table in the firmware.) I ask because the only source I can find for the thermistor I'm looking for is out of the 100k versions.by dslc - Reprappers
Re: Car exhaust putty for hotend resistor - hardening prematurely (in tub) - 11 years ago
@Maxx: thanks for your input. @nophead: I had overlooked the necessity of heat-cycling. Thank you!by dslc - Reprappers
Re: Car exhaust putty for hotend resistor - hardening prematurely (in tub) - 11 years ago
@ShadowRam: this car exhaust putty has worked without problem so far. In fact is one of the methods recommended by both Adrian Bowyer (for his Universal Mini Extruder) and reifsnyderb (the designer of the J-head hotend) for securing the resistor in the hot-end. Other people have mentioned some sort of high-temperature silicone sealant, on the one hand, or just an interference fit if the resistorby dslc - Reprappers
Car exhaust putty for hotend resistor - hardening prematurely (in tub) - 11 years ago
I have been using car exhaust putty to secure the power resistors in the hot-ends I have built - it's similar to this stuff from Halfords: . Over the 18 months or so that I have had it, however, the putty has hardened in its plastic tub. So, I have tried to 'revive' it with water - and it seems to be working to a certain extent (i.e., it seems to be a soft putty again). I assembled a hot-end uby dslc - Reprappers
Re: Jhead MK V thermistors - 11 years ago
Thanks! I didn't even notice that the MK V-B uses a different thermistor. The supplier didn't specify whether it's a MK V or MK V-B they are sending me - but I guess it's probably the newer one.by dslc - Reprappers
Jhead MK V thermistors - 11 years ago
The Jhead reprap wiki page lists the EPCOS 100k B57560G104F as the thermistor (for the MK V at least). I ordered one of these recently (from a reputable supplier), however, and neither the thermistor nor the size of the thermistor mounting hole match the B57560G104F dimensions (2.4 x 4.1 mm for the glass bead). Does one anyone precisely which thermistors are being commonly supplied with these hoby dslc - Reprappers
Creative Machines J-head hot-ends - 11 years ago
After being burnt by cowboy e-bay retailers I am searching for a J-head hot-end that is properly built and does what it's meant to do. I note that reifsnyderb has given good feedback on the J-heads built by Creative machines ( ) - which obviously is a good sign. Before spending any more money, though, I was just wondering if anyone has feedback on - e.g. - a few weeks of use. In particular, Iby dslc - Reprappers
Re: Inline connectors for hotend - 12 years ago
Thanks guys. Both look like good options. My primary concern is crimping the wires. The last time I checked the crimping tools necessary are fairly expensive - so availabilty and price of these will be a factor in whether I choose a Molex or JST connector.by dslc - Reprappers
Inline connectors for hotend - 12 years ago
Hi all. Can anyone recommend a particular type of inline connector for connecting the wires on my hot-end to the cable attached to my controller board? At the moment I have cables running all the way from my PCB (where they are attached by Molex connectors) to the resistor / thermistor leads on the hot-end. It would be useful to detach the cable from the hot-end on occasion - e.g. when removing/by dslc - Reprappers
Re: Gen7 with Rostock delta bot? - 12 years ago
Hi all. Incidentally, tprime, I was just logging back in to document my feedback after trying the Repetier fork by Sousoux - and am only reading your post now. I managed to get past an initial hurdle with Marlin - by setting the fuses to different values (this is outlined by scuba in a separate thread on these forums). This prevented the repeated 'Brown out resets' I was experiencing previouslyby dslc - Next Wave Electronics Working Group
Re: Repetier firmware - choices for host software - 12 years ago
QuotedslcWhen I try to connect in pronterface, however, it times out. I needed to set EEPROM_MODE to 0 in the Configuration.h file - i.e. #define EEPROM_MODE 0by dslc - Firmware - mainstream and related support
Repetier firmware - choices for host software - 12 years ago
Hi. I am hoping to test out the Repetier firmware and have uploaded it to the Atmega 1284P on a Gen7 v1.4 board. When I try to connect in pronterface, however, it times out. I have tried different baud rates, but it doesn't seem to make any difference. I have tried to use the Repetier host also - but it doesn't seem to be compatible the mono libraries on my Debian installation. Has any one gotby dslc - Firmware - mainstream and related support
Re: Printable mini lathe - 12 years ago
@Daniel: good luck with the build (and nice blog). @Sublime: thanks for your input - and for releasing the design in the first place! @xiando: Sublime got there first . I'm low on PLA filament at the moment and am finding it difficult to print in ABS (getting the temperature right, etc.) - but will probably try this once I'm up and running again.by dslc - General