Home » 3D Printer
Category Archives: 3D Printer
I spent some time working with Taulman’s 645 Nylon filament over the last several days and I thought I’d give my two cents. First, for small strong small parts it has real potential I printed some incredibly strong parts. I extruded out a 245C and kept my bed at 70C. I tried painters tape, glue stick and Kapton tape and for me strait Kapton tape worked best. My biggest issue in fact was the print was really difficult to remove from the bed, I actually broke one of my glass plates getting a print off. Now I hope you recognized that I clarified that I had great success with small parts because in all my attempts to print larger more complicated models I encountered failure. Simply put I could not stop the model from warping once the model was a larger size. I tried temperature, infill, skirt, print speed, outer wall size and nothing could stop the warping. So in a nutshell if you need small strong parts like nylon washers or rod clamps it’s about the best filament out there but for large models you might need to look elsewhere.
Once you have a working IMG of the RepRapWeb application on your Raspberry PI you probably want to get it tricked out so you can get to controlling your 3D printer. This is a short description of what I did…
When login on to your image the login / password is not your standard one, it’s pi / raspbian. After the image was created I connected it to the network by hardwire to setup my static IP and WIFI. I used a “EDIMAX wireless 802.11 nano USB Adapter” and that worked great for me. Here is the link I used as a reference http://raspberrypihq.com/how-to-add-wifi-to-the-raspberry-pi/
My interfaces file looks like this and my static ip is 192.168.1.97
just run “sudo nano /etc/network/interfaces” make the changes and your ready to disconnect you hard connection.
iface lo inet loopback
iface eth0 inet static
iface wlan0 inet dhcp
OK my next step was streaming video because lets face it you need to see what your doing. This takes a little while but the directions I found are great. Just go to http://jacobsalmela.com/raspberry-pi-webcam-using-mjpg-streamer-over-internet/ and follow those instructions. You want to follow the instructions to set it up as a service.
** A little disclaimer at this point, as if this writing the reprapweb application does not have a video feed embedded in it. I talked to Andrew and he said he’s working on that now and it should be done soon. Until then you have to run a separate browser window for your video streaming. Not a big deal as mjpg_streamer has a default stream running on port 8080 so once your set up it’s a snap to use.
I’m beginning my install and configurations of a new 3D printing web based controller from XYZBots and wanted to pass on a few things. This controller is pretty strait forward but it sits on a Raspberry PI b+ controller and having never set on up before I ran into a couple of things. First, Make sure you follow the direction on the software site REPRAPWEB when setting things up or like me when you first plug in your board you’ll get nothing but two solid lights on your board, one green and the other red. The issue is if the image you placed on the SD Micro card is not correct you get nothing and that includes nothing on the video to even tell you what is wrong. Below are my steps to get a functional image on the Raspberry pi b+. You’ll know you’ve got a good image as the red light on the board stays red and the green light flashes as it accesses the card.
1) Run “sudo fdisk -l”. Look at what is returned and then plug in SD Micro card and run again, you’ll see the new device name. Mine was.
“Device Boot Start End Blocks Id System
/dev/sdc1 8192 62333951 31162880 c W95 FAT32 (LBA)”
2) Format the card with FAT32, I downloaded GParted app using Ubuntu Software center.
3) Download the latest image from software site REPRAPWEB. I took the image, I might play with the source some day but it won’t be today.
4) Unzip the Download into directory and go to it.
** before I go further you need to remember two things. First, be careful you run dd command against wrong device you will be in a world of hurt. Second, in the directions on the software download site it explains that Raspberry Pi for this install does not use partitions. If you just use the device name you found in step 1 without modifying it and push the image across it will install on the SD micro card but Raspberry pi will not function.
5) to install the code to the SD Micro card run the following. Obviously you need to use the right image name if it’s changed. What is most important is my Step 1 command returned and device of “/dev/sdc1” but my “of” parameter below only uses “/dev/sdc”. The reason for that is removing the last number from the device copies the code in one partition. Also an FYI is this stuff is case sensitive the “M” in the bs=4M needs to be capitalized, found that out the hard way.
sudo dd if=reprapweb-2014-09-09-wheezy-raspbian.img of=/dev/sdc bs=4M
The command takes a while but once it completes you can plug in the SD Micro card to you raspberry and your good to go.
Over the last year I’ve spent a lot of time trying to find conductive plastic that has resistance properties even close to wire. What I’ve found is currently there is nothing on the market that comes even close. Although a plastic “Described” as conducting is offered by quite a few venders the conductivity it pretty bad. If you are making an anti-static pad or a Faraday cage your OK but for most circuits it’s not practical, basically it just plastic with infused Carbon Black.
I did spend some time trying to make my own and I did get some good batches but I had a real hard time with getting consistent batches. If you interested I used Multi Walled Carbon Nanotubes and infused them is standard PLA. believe it or not nanotubes are pretty cheap now. I got mine from “CheapTubes.com“. Yes, believe it or not that’s the name of the company. I tried a bunch of combinations but my greatest success was with MWNT’s around the 30-50nm range. Basic method is to take existing 3D printing plastic and mix it with “Dichloromethane” this liquefies it and after a time just remove to stopper off your mixing bottle and the dichloromethane will evaporate leaving just the plastic infused with the nanotubes. Now all you have to do is get it back in 3D printer plastic form. To do that I just built a 3D printing extruder.
If someone comes up with a better way to do it let me know but the best I was able to get was about 200 ohms per inch, still not what I was looking for but way better then stuff available on the market now.
When selecting the extruder for the RepRapPro be sure to take a little extra time before just selecting the Mini extruder as I did. My line of though was that it was smaller and would look better on the printer which, looking back on it was a pretty stupid reason to make a section. By and large I consider my selection of the Mini extruder to be my biggest misstate with regard to that printer build. Here is what I’ve fount;
- The mini is really small. it’s small so the gear teeth are small which means your prints need to be dead on. There is no room for even a small deviation.
- The threading channel hole for the plastic is static. Simply put it’s a printed diameter hole. threading and working with it is a pain.
- the Friction adjustment is not really all that effective.
- The mounting of the extruder on the printer itself can effect the friction applied to the plastic being extruded. (Really an pain)
So simply put for me the choice of the Mini extruder was really bad! It’s just my opinion but you’ve been warned, choose the curtain on the left and go with the normal, proven Huxley_Extruder.
in the RepRapPro model files it’s the directory Modified_RepRapPro_Huxley_Extruder not the Mini you want. (Picture on left)