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I have a fever, and the only cure is more RepRap.
mandag 26. september 2011
mandag 19. september 2011
mandag 12. september 2011
mandag 5. september 2011
#RepRap Adventures #05 - La révolution!
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It's back! In colour, of all things. I have a few strips with an ongoing story lined up, so expect a new one on Mondays, until I run out of ideas and/or time.
søndag 10. juli 2011
New Prusa snap fit x-ends not fit for PLA?
I just printed the new snap fit Prusa x ends, and ran into a few problems.
The red highlights are where the part cracked under stress. First from inserting the smooth rods, then along the holes for the zip tie, when I pushed in the top lm8uu bearing.
Print settings
This is printed in white PLA from Ultimachine @200 deg C. Nozzle is 0.5mm, layer height is 0.35mm, it has 2 extra shells (thus 3 in total) and infill of 30%. I believe the problem is the flexible part of the push fit design, which doesn't flex at all. I don't know whether it's because of the brittle PLA, or if it can be avoided by using either fewer or more outer shells. Heating the part before inserting the smooth rod will probably help, but
If this is a problem with PLA, I hope there will be an option to switch out the push fit with m3 nut and bolt. Looking forward to having a look at the OpenSCAD files!
Blame the user
The crack along the lm8uu holders is most probably my own fault, it was a tight fit, and I did manhandle the bearing quite a bit. There are some small lips to hold the bearing in place (in the z direction) and the bridge did sag a tad so the bearings didn't fit very well under the top ones. You can sort of see it in the second picture. Using 100% infill might solve this, as moving the holes up would just move the weak spot.
Edit 2011.07.11 :
I just printed the x-end idler, and the bearing holder snapped when I pushed in the bearing (had to use a wood clamp, it was that tight). This trouble might be my printer drawing outside of the lines, instead of on the inside. I'll be back with more info.
Difference in PLA?
This is the first object I have printed in this white PLA, and it might need a little skeinforge tweaking to get perfect. It seems to flow more, and thus pushes out more plastic than with the other Ultimachine PLA I have. (Silver, transulent blue, natural and black).
For this print I tried to drop the speed from 60 to 55mm/s, and on the x ends, it didn't loose enough y-steps to ruin the results. I have a theory it might be the weight of the plastic spool keeping the maching from rattling, anyone else experienced this? I still can't print gregs lm8uu x-carriage properly though.
New hot end review on the way
While I'm blogging, I might as well drop in a picture of a nice little puzzle I got in the mail:
It's an Arcol 0.35mm hot end, which I'm looking forward to try out. One thing I'm a sceptical about is the hot end relying on threaded PEEK to hold the pressure. People have a lot of good of things to say about this design, but to me a push-fit version just seems a the "safe" way to go. Also, it's a bit large to fit on gregs lm8uu x-carriage, so I have to figure out which printer to put it on, as it won't fit on Adesina now.
tirsdag 21. juni 2011
torsdag 16. juni 2011
My biggest print yet, and it's creepier than I thought it would be.
I've always wanted to print one of these, and when a simple straight-to-skeinforge-version with non-broken stl files was posted by RoTorIT - http://www.thingiverse.com/thing:9321 - I had no excuses any more. Thanks a lot. :)
The body piece is 22cm across, and printed diagonally it took every single mm of bed space I have available, which turns out to be 170x185mm. I even had to turn off skirt to make it fit, and it came dangerously close to the bolt heads on the bed. But it was totally worth it. the spider is HUGE.
Total print time was close to 24 hours @55mm/s. I had to print one piece at a time, because for some bizarre unknown reason I lose y steps if I print several objects at the same time. Some of the pieces are the same, and I'll post them here for your enjoyment:
In case you didn't notice already, it's printed in transculent blue PLA from Ultimachine, which is UV reactive. It looked far less scary when I took the pictures last night.
Imagine this scenario: You place the spider in a dark corner of the basement, with the room lit only by a single bulb. Then you hook up a motion detector which turns off the bulb and turns on several UV leds pointed at the spider. I'd do it, but it'll probably be smashed to pieces in blind arachnophobia fear, and I really don't feel like printing another one (before I have a giant bot farm).
The body piece is 22cm across, and printed diagonally it took every single mm of bed space I have available, which turns out to be 170x185mm. I even had to turn off skirt to make it fit, and it came dangerously close to the bolt heads on the bed. But it was totally worth it. the spider is HUGE.
Total print time was close to 24 hours @55mm/s. I had to print one piece at a time, because for some bizarre unknown reason I lose y steps if I print several objects at the same time. Some of the pieces are the same, and I'll post them here for your enjoyment:
- Part 6 & 7
- Part 8 & 9
- Part 20, 22, 24, 26 (small leg)
- Part 21, 23, 25, 27 (large leg)
In case you didn't notice already, it's printed in transculent blue PLA from Ultimachine, which is UV reactive. It looked far less scary when I took the pictures last night.
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