By
GuyS,
in Coffee corner
A proton and a neutron walk into a bar. The proton says "I think I lost an electron. Help me look for it!" The neutron asks, "Are you sure?" The proton replies, "Yes, I'm positive."
Well, that's a sad story. And it becomes even more sad after a quarter of an hour. Because then the two separate. Why? Well, at least one famous community member from Sweden knows for sure...! Sorry that was off-topic... and not (hint: that community member is already mentioned in this thread)...
Hmm, there is also the version where two groups walk into a bar, ²H and his friend and ³H with a buddie, and together they go He He nn boom.
Anyway, I got myself a nice idea 
Now again the challenge, how small can I print it. Why always so small as possible :(
Ok, I'm done, here's some ABS molecules 
I'm sorry.. you didn't upload it in the Print section. This is not a valid entry
Ok, I'm done, here's some ABS molecules
You stole my idea! I even had added a banana for scale :(
I'm sorry.. you didn't upload it in the Print section. This is not a valid entry
:(
I see progress here.... moving from "bitterballen" to bananas
We have different definitions of progress @UltiArjan
(no offence Bananas!)
The bartender says "We don't serve your kind!"
A neutrino walks into the bar.
It's pretty silent here - still no valid contribution?
The tinker-cave became a temporary maker-cave again and i had some fun today.
So - here is another non-competitive post.
Each "chocolate sphere" represents a carbon atom - and all together are building C3H6O - better knows as "acetone"
And i yet had a banana left...
Mine is coming tomorrow if all goes right, had some other stuff to attend this week.
Time to learn about stuff we use daily without knowing much about. Yeah it melts at certain temperatures, depending on the manufacturer, or has a certain glass temperature so the heated bed must be this hot. But what is PLA actually?
Well, PLA is Polylactic acid. Poly stands for many, so many actic acids, you'd say? Today Wikipedia told me it does not use correct Organic nomenclature, as defined by the IUPAC, as it is not a polyacid, but rather a polyester.
Instead of further citing Wikipedia, have a read yourself, it's quite interesting: https://en.wikipedia.org/wiki/Polylactic_acid
As I hinted earlier, I wanted to print PLA! Not only with PLA, but also the PLA molecule. Or rather the a block of the chain. So PLA is a chain with many copies of the link I printed, as can be seen in the picture. As the picture explains, the green are the Hydrogen atoms, grey are the oxygen atoms and blue are the carbon atoms, sadly I didn't have enough time to print that with colorfabb Carbonfill :(
Without the element of surprise on my side, I have the honours to announce this weeks winner..
We all loved your entry in the office, your original idea and the effort you put in it and the fact we all learned something (I'll certainly read up to the wiki-page).
I'll DM you in regard of your prize!
Next week is going to be the last contest. 
For this reason and the due to the holidays in between we are extending this contest until January 4th! It is going to be a creative contest, so I think the extra week and creative juices during the holiday should get the entries to an unmatched level!
It's a shame there weren't more entries :( Would have liked to see what molecules other people like, I was figuring people would go for coffee with sugar or dopamine and such
@tinkergnome I wonder what settings you printed with. Again 0.1mm layer height and 30mm/s. I couldn't get the letters to print nicely. I did avoid melting the hydrogen atoms by printing 4 at a time in each corner of the bed, and cool head lift. Next time I would try and print colder, to reduce stringing.
I did however by accident got the pause to work, there's a slightly underextruded layer somewhere because I had left the setting on.
@SandervG, I really like these contests, both to get creative and learn stuff 
@Titus: Congratulation - it's well deserved - you were the only one who doesn't dreaded the effort!
It's a shame there weren't more entries :(Would have liked to see what molecules other people like, I was figuring people would go for coffee with sugar or dopamine and such
I assume it's a combination of
Why always so small as possible :(
and
...had some other stuff to attend this week.
@tinkergnome I wonder what settings you printed with. Again 0.1mm layer height and 30mm/s. I couldn't get the letters to print nicely. I did avoid melting the hydrogen atoms by printing 4 at a time in each corner of the bed, and cool head lift. Next time I would try and print colder, to reduce stringing.
Indeed... 0.1mm layer height, the basic speed was 35mm/s but reduced to 85% for the outlines, 20% infill (*), PLA 198°C.
Another important detail for small stuff is probably: minimal layer time 12 seconds, this reduced the speed for the top layers down to 8mm/s (approx.),
and enough cooling..., hydrogen was printed with 8 pieces at a time and 2 or 3 at a time for the bigger ones.
(*) i have a suspicion, that the infill percentage is not exactly comparable between Cura and Simplify3D, but perhaps this is only my personal impression...
Regarding the letters:
I didn't scaled the provided STL files, but changed the parameters in the scad file and generated new ones.
The "hydrogenDiameter" was set to 11 for my example. And i changed the size of the text to 4 (take a look at line 97 of the scad file - if you're interested)
I don't know if this would break the rules of the contest - but it's a construction set, isn't it?
(and it doesn't matter in my case)
Let's see what comes next...
@tinkergnome: I agree with your theory about why there were not more participants. Personally, I think people are a bit tired of printing small. But next contest will be about creativity again; I'm sure we will see many more contributions.
If UM is going to continue these contests (who said coffee mug?), then maybe it could be an idea to start with a story (as the UM website is very strongly about stories) and to develop that story by 3D prints. And every week or so, UM decides which way the story should take, from the contributions...
Indeed... 0.1mm layer height, the basic speed was 35mm/s but reduced to 85% for the outlines, 20% infill (*), PLA 198°C.
Ah! That could be something, reduce speed for outlines to create a smoother outer layer! Must experiment with that one day.
Another important detail for small stuff is probably: minimal layer time 12 seconds, this reduced the speed for the top layers down to 8mm/s (approx.),
Hm, minimal layer time makes the speed go slower, but doesn't that kill the quality as the nozzle "stays in the same spot so long" due to the slow speed?
Regarding the letters:
I didn't scaled the provided STL files, but changed the parameters in the scad file and generated new ones.
The "hydrogenDiameter" was set to 11 for my example. And i changed the size of the text to 4 (take a look at line 97 of the scad file - if you're interested)
I don't know if this would break the rules of the contest - but it's a construction set, isn't it?
(and it doesn't matter in my case)
Damn, that's cool! And might have been breaking the rules, but then again, it shows you that if you do want to print something, you can do so many things to make it work!
@tinkergnome: I agree with your theory about why there were not more participants. Personally, I think people are a bit tired of printing small. But next contest will be about creativity again; I'm sure we will see many more contributions.
If UM is going to continue these contests (who said coffee mug?), then maybe it could be an idea to start with a story (as the UM website is very strongly about stories) and to develop that story by 3D prints. And every week or so, UM decides which way the story should take, from the contributions...
Yeah, I tend to agree there. Although I'm learning to print smaller, it is still damned hard!
Hm, minimal layer time makes the speed go slower, but doesn't that kill the quality as the nozzle "stays in the same spot so long" due to the slow speed?
Not in my experience, the fan speed is increased as well. I can only speak about an UM2 with Olsson block - 8mm/s at 200°C for PLA seems to work fine.
I think you're right - if in doubt - there are so many parameters to explore...
I'm running 100% fan always, so I guess that's still the problem. UMO fan's are lacking?
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