The 3d printer that i am about to show you how to build is not only one of the most affordable printers, but also is on of the most simplistic. Anyone can build the Deltatwister! You don't need any 3d printed parts or cnc machine to make this printer...Everything except the extruder can be made using hand tools like I did. Being 15 years of age i designed and built this 3d printer. Practically anyone with basic mechanical skills can build their own Delta Twister! Having a print volume of over 1000 cubic inches this printer really has it all...for only $400 compared to $800-3000. If you like what you see then please vote for me! I would really appreciate it.
You will need:
(1)Ramps v1.4 circuit board with drivers
(1)Arduino mega 2560 circuit board
(3) 36" 8mm linear rods
(6) 8mm linear bearings
(2) 3/8 in wooden dowel rods(4 feet each)
(12) 8mm rod ends
(4) nema 17 stepper motors
(3) stepper pulleys for a 5mm shaft
(1) 6M legnth of belt that fits your pulley
(1) rep rap heated bed.
(3) 3d printer endstops
(1) pc powersupply.
(3) computer fans
(1) j-head printhead
(1) extruder with a bowden tube(airtripper has a good unit).
(1)Meter of 1.75 mm Teflon tubing
This should total out to well under $400.
The frame is key to a successful 3d printer.
What I did was make two equilateral triangles with sides two feet in length. I then cut 4.5 inch equilateral triangles off each of the vertices. I then made 3 pieces 4.5x38" as the sides. I included a picture of the triangle if that will help.
I then used 1" sections of 2x4's to act as supports for the main pieces. The long pieces are all 38 inches x 4.5 inches.
What i did to make my linear rod supports was i cut a 1" section of 2x4 i then drew a line straight down the middle. I then repeated this for the other sides. After that, i measured 2" out from where the two lines intersected longways and made a mark. This is where the two holes were drilled(8mm). You will need 6 of these. Try to machine these pieces as accurate as possible. I recommend a drill press, but if you can make a jig to do this perfectly that is okay too.
You will need to cut your 8mm rods to a little bit less than 29" each. It is important that they are no taller because that will throw off the geometry of the machine. The dowel rods must be cut to 12" each and sanded on the ends so that you can screw them onto the rod ends.
Conveniently, 8mm linear bearings fit perfectly onside 1/2" pvc pipe. All you must do is drill holes in the sides and zip tie pipe holders onto the pvc pipe. Drill two 8mm holes in the holders and slide a 3 1/2" section of 8mm rod through. After this add additional stability by screwing in 1/4" x 2 1/4" bolts on. The pictures are pretty self explanatory.
It is important that your rod supports are exactly where they should be. Any wood screws will do the job, but jist make sure you don't split the 2x4. The rods must be 100 percent parallel to each other an at 60 % angles.
Your motor mounts don't have to be pretty, they just have to do the job...holding the motor securely in place. All I used was a motor shaped piece of plywood and garden wire to tighten it down. Once your 3d printer is complete it will be easy to print yourself a motor mount.
Just try to make this as accurate as possible. Mistakes can mess up your prints. Ideally your printhead carriage will have sides at perfect 60 degree angles...Once again though, it should be simple enough to just print one out once you are finished with your printer. All that I did was zip tie the 8mm rods on the sides. Your carriage can be pretty much any size; you will just need to edit the size in the firmware.
All you need to do is simply zip tie the endstops where you want them. The only necessity in this step is that they must all be at the same height and the arm carriage must activate the endstop when it moves up in a process called homing. You will understand this process more once your printer is built. It basically auto levels the system.
Here is a wiring schematic provided by rep rap wiki. Just follow the Schematic and you should be good to go!
Basically all I did was go to the hardware store and buy a sliding door roller. I put it on a 1/4 inch screw and tensioned the belt with two pieces of plywood holding the pulley down.
I use a software called repetier host for my printer. They already have a delta format which makes it very simple to use. The firmware that I download onto my arduino board is called marlin. Richard Tegelbeckers provided me with the firmware that I needed because I am awful at coding as may be some of you. Thanks Mr. Tegelbeckers!
The picture is provided by Repetierhost.com
It is now time to test your 3d printer out. Congratulations!!! hopefully it will look somewhat like the video.
Note: It will take a little bit of tinkering around to get prints looking like you want them to, but hey! you now have a working 3d printer!