Madox wrote:Nice use of the pen clip!
I have an extruder project that i'll probably never get around to.... if it isn't too much to ask, can you adapt your design to work around the current overheating issue as well? i.e. perhaps a fan mount on the other side?
PS : Do you know about 'Robots and Dinosaurs'?
pleppik wrote:I love this concept, especially the simplicity of scavenging the spring clip. I have a reel of troublesome filament which would make a great test case--I'll give this a whirl as soon as you post the STL.
DrewPetitclerc wrote:Very nice work.
Thanks for the reference to my work.
The only thing I would be concerned about is the friction forces, when the motor has been running awhile it is weaker due to heat/magnet stress and heat softening of the spring element, so that friction with the spring element could stall out the motor.
I have seen this happen when I recently tried some Polycarbonate, at 260c temp it needed my help (pushing the filament by hand) feeding as it has a higher viscosity and the motor had trouble turning even stalling completely.
This also why I run PLA at the 260c ABS temps as its higher viscosity at the 200c temp makes it stall or slip (clicking) when extruding and the nozzle to build plate distance can setup a back pressure causing stoppage.
All that being said.
I think your design is inventive and great, please keep up the great work and I look forward to seeing more.
Eurisko84 wrote:Cheers for the input guys!pleppik wrote:I love this concept, especially the simplicity of scavenging the spring clip. I have a reel of troublesome filament which would make a great test case--I'll give this a whirl as soon as you post the STL.
I can certainly upload the file - but its still in a "alpha" stage at this point. In other words, it does have some problems, such as the air pump design is a prick to remove the internal support (due to the crossmember) but I wouldnt want to remove more material from it as it does assist in preventing flex. There are no dimples to insert the cover, and the gap is specifically designed for the artline pen at 0.7mm thick.
pleppik wrote:Still volunteering to help alpha-test
I don't see matching the model of pen as a major issue. Artline pens are carried by some art supply chains here in the U.S., and the clip looks very similar to what I've seen on other brands. A trip to the office supply store could probably identify a half-dozen candidates, though I don't imagine the store would appreciate my opening the packages to measure the clip thickness with my caliper.
Eurisko84 wrote:Uploaded to Thingiverse - http://www.thingiverse.com/thing:18010
pleppik wrote:Doing a test model right now, using my grodiest reel of plastic. This one varies from 1.60mm to 2.0mm, and jams the stock feeder every time. So far so good, but I want to get a few models pushed out before I declare victory.
pleppik wrote:pleppik wrote:Doing a test model right now, using my grodiest reel of plastic. This one varies from 1.60mm to 2.0mm, and jams the stock feeder every time. So far so good, but I want to get a few models pushed out before I declare victory.
The filament jammed when it hit a spot where it was around 1.9mm diameter. I think it may be jamming against the metal tube leading to the nozzle.
So this isn't a cure-all, but it did work a lot better than the stock component, especially with the undersized filament. With this reel and the stock parts it would jam every 2-4 grams. I got out about 15 grams on this test before it failed.
odiegel wrote:Eurisko, I suspect the problem with the filament wrapping around the gear may have been due to you not having the plastic 'block' bit that sits around the gear which helps direct the filament the way it's supposed to go. So if using the pen clip (nice idea, by the way!), it would still pay to have something to guide the filament, particulalry as it leaves the gear/spring?
odiegel wrote:Hi All,
Here's my little contribution, though not quite finished/tested yet. Have added baby fan for cooling instead of compressed air, and made a few slight mods to Drew's design to all for more pressure (as I intend to print in thermoplastic rubbber). Will do a bit more work on it over the weekend and try printing and testing in the next week, or so. Once design is finalozed, I'll upload the files...
Incidentally, I printed a version very close to Drew's original mod in South Africa last week on a plastic laser sintering system and it 'appears' to work wihtout needing to be machined out of aluminium. Also meant I could do a few minor mods as machining complexity wasnt an issue. Will do some more, now that I am back in NZ, to confirm that Nylon will last. If it does, it will make a much easier way of manufacturng the parts than machining, which equals cheaper.
Eurisko84 wrote:Just a quick update guys, I have recently revised and upgraded the cover to include a few more mods. I will post the pics later tonight if I get a chance, but heres a quick rundown-
1. Added two fan mounting points to mount on the back and side of the servomotor (50mm fans were all I had available - salvaged from a RAM cooler kit I had).
2. Increased the diameter of the fillament feeder and exit holes, and moved the exit of both much closer to the gear (to cool and prevent mis-feeding)
Users browsing this forum: No registered users and 0 guests