So lately in 2016 (and quite a bit today) i’ve taken a look at revisiting my original DIY Taffy Pulling Machine from 2012. There was a lot of interest in the 2012 version, and i did try to provide enough information and detail in open source fashion for others to build their own, but i guess things just didn’t work out the best for that to happen.
The biggest reason i revisited it is because it just didn’t quite feel finished, and quite frankly those big gears posed a pinching hazard. Plus many people didn’t know where to get their own. So in an effort to solve both problems in one i decided to make internal gears, but to do that successfully i had to shrink them down. In the process i decided it was time to make the gears 3D-printable thereby speeding up my own design process, but also opening up this design to a whole new set of people that otherwise would not be able to make one.
I hereby am pleased to announce the re-releasing of my Mini Taffy Machine as an Open Source Hardware project. I have improved the CAD files and PDF assembly drawings with good blueprint title blocks (a skill i obtained from my recent machining courses this semester). So i hope you all enjoy and i look forward to seeing more of these in the wild and new iterations and modifications that people come up with!! (http://www.thingiverse.com/thing:1659568)
So despite the blog and my internet presence being quite mute as of late i actually have been up to quite a lot. My homemade Lulzbot Mini 3d Printer this summer was a success, amd i have constantly been improving it. At some point i will take some photos of it’s final progress. A few of my pea breeding crosses from last year were successful, including one i’m excited to grow again which is a cross of the Purple Passion dark purple seeded pea (which is a small genetically weak pea variety) with another stronger pea variety. That should produce something really cool in the coming years. And this fall and next spring i’m experimenting with school by going through a Precision Machinist course and am learning how to use milling machines, lathes, and CNC equipment to produce Aerospace quality components. Not sure if that’s something i want to do long term, but they are skills i’m interested in and can use throughout my life. So that’s new.
Anyway though, as a throwback or a revisit to my post in 2010 titled “Do Plants Really Need Sunlight?“, which has actually been one of the most visited posts on my blog over the years, i finally got around to building a few of those coils that sounded so interesting.
So the basic premise or idea behind using a coil of wire with electricity is that it produces a small amount of electricity or a magnetic current through the air. This is the same idea Nicola Tesla was after all those years ago when his imagination was captured with the idea that everything could have wireless electricity. And in many cases his dream has come true with an ever increasing amount of technology these days using induction to wirelessly power or heat things. The basic premise of applying this technology to plants comes from an articlei read once that talked about how researchers were able to measure a small direct current from trees in a forest by placing nails in them. They then had ideas about placing nails in many trees and hooking them up together to power small electronics like a battery or cell phone charger, or a smoke alarm. Basically all plants (and maybe all living things) produce a bioelectric field of energy. If one can tap this field to harvest electricity, then why cant we tap into it and feed these plants with extra electricity to help them grow.
One question i asked in my old blog post was if plants even need sunlight at all as long as they are getting some form of energy to grow. I still haven’t done an experiment to test that idea, but it’s still an interesting question. Because it makes me wonder if there are ways plants could be grown in complete darkness.
Regardless, this summer i finally built a prototype plant coil. I built it rather late in the season, so i really wasn’t able to give it a good test. My original plan was to plant 3 or 4 genetically identical tomato plants near each other in the relatively same soil with at least one plant being the control. I was then going to observe over the course of the summer f the tomato plants within the coils had larger and better growth than the control. That was plan anyway, i just didn’t quite get to it.
You can see here we were trying to use a volt meter and another coil to see if we could detect that our coils were working. We weren’t having much success with the meter in the beginning and i don’t remember if we did later after increasing the power supply a bit. But in theory you should be able to measure with a second coil.
I placed it on three smallest tomato plant clusters in the very late planted tomato patch. Interestingly enough, the three plants it happens to be on might be the only three blue tomato genetic varieties that survived my haphazard tomato disasters this year. Since placing the coils on these plants i have noticed an improvement in them and they have since catched up to the growth of the other tomato plants in that spot. Although at the same time i did also make a furrow and started watering them more. But even so i’d be willing to go out on a limb and say that the coils did help them go from “runt” status to catching up to the others. I may yet get a few tomatoes from the larger two before winter hits. Thanks to Gilbert for providing the motivation to actually build this project. And a thanks to the Homegrown Goodness plant breeding forum where i get so many of my adventurous gardening and plant breeding ideas. You guy’s are the best and a continual inspiration to me. Read more: http://alanbishop.proboards.com/thread/8623/breeding-tower-potato-ideas-wanted?page=13#ixzz4LoiDtFZE
So, while my experimentation was a bit haphazard this year i think i still did ok. It was a fun project that went from an interesting patent to a cool project idea in my head and at the back of my mind, to a fully functional project / prototype. Plus i think these coils look cool. haha.
But it makes me wonder what other cool patents are out there that i can exploit, reverse engineer and build to experiment with. One of my next projects i think will go the opposite route and will be heavily steeped in Open Source as i think i will try and build a “Food Computer“. Basically it’s a small climate controlled aeroponic grow box. It should allow me to continue my plant breeding efforts even in the winter which is really what i want. Plus it will allow me to learn more about this “urban gardeng”, “vertical gardening”, and “aeroponic” stuff. I can’t wait to get back to pea, bean, and tomato breeding even though the summer and fall are waning fast. I think i’m going to repurpose my 2ft x 2ft t-slot frame that i was intending to turn into a large 3D printer and/or CNC mill. But it’s still going to be a long time before i finish that project, so i figured hey why not actually use it for something useful in the meantime! So.. that’t the plan.. 😀
So recently i’ve finally gotten my homemade / homebuilt Lulzbot mini working. And it’s working pretty good. The most critical problem i was facing was that my 3d printer would start printing either too close to the heat bed (or if i added extra bed leveling washers) it would print too far away. This was a critical problem as the first few layers are the most important and if you can’t get you prints to stick to your print bed then the rest of the print will usually unstick and fail. Thanks to some helpful people on the Lulzbot forum i was able to adjust my z-offset to the correct height that worked for me.
The second issue is that recently i’ve noticed my large and tall prints failing miserably at a certain height and the filament not coming out thick enough and the top gets all cob-weby like a spider web, but worse. Apparently this is called “Heat Creep”. The problem in part may be caused by the tiny blower fan on the Lulzbot mini not providing enough cooling and heat slowly rising in the hot end until the filament actually melts too soon and cannot be extruded properly. This makes sense as the problem only occurs after a long time printing. So the logical step was to replace the tiny blower fan (or squirrel fan) with a larger fan that will do the job. The new Taz 6 has obviously taken that tiny fan into consideration and has changed it to a large 40mm fan.
EDIT: The failing on large prints may be due to me using a half-size stepper instead of a full size stepper motor for the extruder. This means too much voltage is being applied to the motor and it is getting super hot. Over time this means the motor looses steps and probably causes my printing problems.
Unfortunately the Taz 6 x-carriage and modifications are not a drop in replacement for the Lulzbot Mini i decided to make my own. This is what i came up with and it seems to work beautifully. http://www.thingiverse.com/thing:1587110
I have only tested this on HIPS so far, but it has eliminated the heat creep i was getting with HIPS. PLA apparently suffers more from heat creep problems than other filaments, but this mod will likely help with PLA heat creep issues as well.
Here are a few photos from my first test prints on my new, now functional (for the most part), DIY Lulzbot Mini that i made myself from scratch (minus the frame and electronics). All hardware assembly and electrical wiring were done by me. Phew. What a ride it’s been. The upside is i now now how this printer works inside and out. The downside it was more trouble that it was worth and i wish i had just bought one instead. lol. Whatever though.
Today i made significant progress on building my own Lulzbot Mini 3D printer from scratch. Technically i now have two 3d printers i’m building from scratch, but the other one is bigger and one i’m designing myself. Just like me to not finish one project before starting another. At least i’m going to work on this one and finish it before continuing on my other one (which might be converted into a homemade CNC mill).
Today was a major milestone because most of the components are put together and i finally was able to test part of the electronics i wired up myself. I was able to test the Y-axis motor and limit switches as well as the X-axis stepper motor. All seemed to function correctly using Lulzbot’s Cura software. The software did have an unexpected safety feature however, it wouldn’t let me turn any of the motors on without the bed thermistor wired up. So i had to wire up a temporary 10k thermistor for testing purposes. It worked great. I was running the Cura software under Ubuntu Linux. The Cura software gave me an error that it could not autodetect the serial port or something like that, so i ran it as the root super user and that fixed the problems.
Since i’m building this thing from scratch instead of buying one premade i’m trying to find ways of cutting costs. Although i think i will end up spending more than i hoped. But anyway, part of that is looking into ways that i might be able to replace expensive commercial products like the IGUS bearings and the Leadscrew nut. I’ve already drafted up a 3d printable version of the leadscrew nut and posted it here on Thingiverse. The nut has yet to be tested, but i’ve also had some RJM-01-08 IGUS bearing replica prototypes made in Nylon. The RJM-01-08 IGUS replica bearings turned out to be too tight, but with a drill i was able to make them usable. They are currently being used to remove the wiggle and slop i was experiencing from using the 1mm too small LM8UU ball bearings.
I originally got the LM8UU bearings as a cheaper alternative to the commercial RJM-01-08 IGUS stock bearings the Lulzbot mini uses thinking they would work. They work, and i am currently using some, but the stock STL files from Lulzbot have holes that are 1mm too big because of the slight size difference between them and the LM8UU. I might try to modify the STL files [i have modified the lulzbot solidworks files] to make LM8UU compatible parts in the near future, but for now i’m happy with my 3d printed nylon ones. I’ve heard PLA might work too, so i will experiment with that in the future as well.
The first update is that i’m still steadily designing new parts in solidworks for my custom 3D printer. This photo is one of two y-brackets that will hold the 1020 size t-slot extruded aluminum (from 80/20) y-axis beam. It looked good in Solidworks, now it just needs to be fabricated (3d printed) into a real-world working part (as with many other parts).
It’s really fun designing parts and then seeing them become real functional parts. Recently I’ve even been looking into a local program for CNC machinist training as a job. Apparently there is a large shortage of qualified CNC machinists in my area along with a booming and returning engineering and manufacturing hub here in the area.
While i was designing new parts and fitting them together i found a few minor problems with a few of my old designs being off and not lining up properly with the 1020 extruded aluminum. So i spent some time fixing that and cleaning them up a bit. Good to find those errors on the computer first than after i make the parts.
I received the prototype PCB’s for the XYZZY Motor Controller 1.0, The downside is I’ve found numerous errors that i missed, so I’ve been trying to fix those. But then to compound those problems the main circuit itself has a problem where the HIP4081A h-bridge chip circuit is only driving a motor (in this case a test load LED) in one direction. At first it was shorting out the other direction, but now i think it just loads the current down and does not activate one side of the hbridge. It’s actually driving me crazy trying to fix it and find the cause of the problem, but it’s still quite a mystery. Perhaps electronics is just not my thing. Perhaps i really should give up on that project after never being able to have good success. But i don’t know.
In plant breeding news: i was able to harvest three corn cobs this year. Two were decent sized purple husked corn cobs, the other was a good multi-colored flint. The third one had lots of kernel color diversity, it even had several speckled kernels, and chin-marked ones, and even some that had both speckles and stripes! I recently found purple sweet potatoes at Whole Foods and i will be trying to sprout one and grow my own slips for next year.
I was also able to grow a few good squash this year, some good progress on the pea breeding, and an excellent year with Joseph’s Watermelon Landrace. Sorry, i didn’t get good photo’s of the watermelons, but i had some excellent red sweet watermelons and some good yellows as well. Especially for Northern Colorado, the watermelons are the plant breeding project i’m most excited about and ironically having the best success. Can’t wait for next year! And all this despite it being an incredible difficult and strange gardening year!