Quotedursi The problem is.. what type of 3D printer can print Peek ? we need for our purpose to print Peek, we are now making this proces by CAD/CAM with a 5 axis mil. but the cost is to high. We need to make smal pieces like 2x0,5x05 cm. for one side with Peek, and in other side stunt with 5x5x5 cm. in ABS or other material that could give us accuracy for work in it.. Less 10.000. - What kindby nicholas.seward - Developers
It sounds like a SLS machine will best suit your needs. You can nest many parts into the build volume and get pretty good rates of production. I suspect that the surface quality of a FFF print won't satisfy you. Even if you can hit the accuracy/precision goals you listed above with a perfectly rigid machine and a perfect hot end you will have inconsistencies in the filament diameter. Bottomby nicholas.seward - Developers
@dursi: I have a Revolution XL and it is no where close to your specifications. The extruder has some issues. Some people have swapped them out for others extruders. Otherwise is a solid machine that is well engineered. (It can go 1000mm/s but that is meaningless because you can only do that if you move from one side of the platform to the other directly. Printing a part will never get to tby nicholas.seward - Developers
I probably couldn't commit to a build like that. I have never made a heated chamber and I haven't had success printing at the speeds you are requiring. As cozmicray mentioned, you listed design requirements instead of what you are actually wanting to achieve. What do plan on using this for? Can you justify why you need all of the specifications you listed. I personally feel that the best couby nicholas.seward - Developers
Quotecozmicray Nick mentioned I think your only option will be to commission a build if you want it all. A QuadRap with a modified E3Dv6 hotend in a heated chamber will get you close to this spec. Where does one purchase a QuadRap? or is it just a design? is not a store Why is it a GOOD choice? for 5x5x5cm parts QuadRap is actually a few designs (all good) and is not a product. Youby nicholas.seward - Developers
What you want doesn't really exist currently. You will see some printers claiming all the above. As a general rule, run from these companies. Able to print hollow objects even with huge overhangs in ABS with no warping. 45 degrees is the limit for all machines unless you go to non-planar slicing which no one does or use support material. To prevent all warping, you need a heated build area.by nicholas.seward - Developers
$200 is the comfortable bottom price of all the parts. After markup, $500 is a good lowend retail price for a stripped down machine. The RPi will just replace one thing with another thing of about the same cost. The benefit is that the RPi can also do all the things a computer can do.by nicholas.seward - Developers
Power to the steppers doesn't matter here because I am talking about the gantry falling when the power is off. With my 18mm drive spool and 3:1 reduction I have .1mm fullstep resolution. Without the reduction it would be .3mm. Ouch. Do you have a XZ machine? I would love to see pictures.by nicholas.seward - Repetier
Quotewoo 2 nicholas: I am shure that there is no need for this in xz. This system with timing belts is strong enough to keep gantry in place when motors are off. Also with xz z axis is fast so i dont see a problem when zeroing z axis on zmax and then x and y I don't use belts. I am using string. If I did use belts, it would still be nice to have more Z resolution. Additionally, I already haveby nicholas.seward - Repetier
- How do I calculate the optimal arm length? I know there is a nice math paper floating around on this topic but someone else will have to track it down. Optimal can mean lots of things. Shorter arms get you more height. Longer arms get you a better build area to printer area ratio. Basically, there is no optimal length. You need your target specs to zero in on a target arm length. - What bby nicholas.seward - Delta Machines
Quote3dprinterdissertation Would a hydraulic arm work well for a 3d printer? Could you get the right speed and accuracy? Was thinking single arm moved with syringes. What would be better, cheaper, easier, Using steeper motors to drive water pumps or actuators and a second syringe for movement? Any help would be appreciated. Thank you It could certainly be done. You can design it for any speed aby nicholas.seward - Polar Machines, SCARA, Robot Arms
@Feign: I was doing an experiment to see how I liked using Google+ for design feedback. I liked it well enough but it sucks that you can not embed pictures in the comments. I definitely prefer a forum thread as a good place to archive the info. I will be sure to make a RepRap post if I take the concept any further. I have to say that the concept I posted was so raw that I was a little embarraby nicholas.seward - General
I did a hackish MarlinXZ. I tried a quick stab at Repetier but it didn't immediately work for me so I thought I would give Marlin a stab. It ended up that Marlin worked for me after my first stab. That should not be a comment on which one is better or worse. In fact, I think Repetier is better and would prefer to use it. I think the problem is just that I don't fully understand what is goingby nicholas.seward - Repetier
Sorry. I stated that wrong. There needs to be a 3:1 reduction. This keeps the gantry from falling. Actually it would be nice to pick the ratio. I have sketches of a 5:1 and 3:2 setup. The 3:2 makes a lot of sense. X=m*x-n*z Z=m*x+n*z This would be the generic solution. m and n would be constant integers. I have no expection that you guys will tackle this. Thanks for the attention. Kby nicholas.seward - Repetier
A quick skim of the code from my phone seems to indicate that it doesn't account for the 3:1 reduction in the Z. This is complicated because some people may want other ratios. 5:1 or 3:2.by nicholas.seward - Developers
First, that is awesome. However, I skimmed the code and it looks like it is just the CoreXY code but with the XZ axes. This is not true. There is a 3:1 reduction for the Z. X=x-3z Z=x+3z Uppercase for motors and lowercase for actual positions.by nicholas.seward - Repetier
Yeah. PM me your email and I can send you my hackish version to get you started. I (or someone else) needs to make a more general solution.by nicholas.seward - Developers
That sounds promising. I will be interested to know what is the max stable step rate.by nicholas.seward - Developers
That is great work. Do you have a real time OS running?by nicholas.seward - Developers
@Endlane: It will be fun to see what people work up for variant machines. I have to note that I contemplated off plane solutions (for months) but kept the 1 plane for flexibility. Within that framework I have gotten the machine to a very comfortable width. 475mm frame for a 225mm range. That is comparable my Printrbot Plus. (425mm frame for a 200mm range.) I am sure I could do better but simby nicholas.seward - Developers
@scottie4442: The plans are to make it more than a mini fair. I think this year will be small but the fair space and the geographic location should make it pretty popular.by nicholas.seward - RepRap User Group - Arkansas
Too bad we are all spread out. Luckily, there are some early plans of having a serious Maker Faire in Little Rock this spring. I will keep you posted.by nicholas.seward - RepRap User Group - Arkansas
Using two steppers adds cost and doesn't really solve anything. As drawn the bed can get out of level.by nicholas.seward - Developers
@DaveGadgeteer: Good catch. As drawn this will cause an S curve on that edge of the build platform. It would be a simple matter to balance this out.by nicholas.seward - Developers
This may be a more sane arrangement. I made it a 7:1 for fun but I probably would stop at 5:1. The green pulley is the drive pulley and it can be located at the top or the bottom depending on your goal. I got rid of the crossing at the bottom to make it easier to envision electronics and such fitting under the printer. Again, all the holes for pulley mounting could be on just 3 pieces of flby nicholas.seward - Developers
@MrDoctorDIV: Here is a rough idea of how I would go about it. There are obviously many variations. As shown it is 3:1. It would be easy to make it 5:1 or 7:1. (any odd number) This is essentially the QuadRap solution made to be easier to use with a laser cut machine. Each back dot could be a plastic block that is clamped to the string. It would be easy to have this block loosely screwby nicholas.seward - Developers
I was curious of what the print area looked like. This makes some assumptions such as the short arms can only rotate 90 degrees back and you never try to cross a singularity. 165mm is a reasonable circle. Rectangles that can fit... 250x110, 200x125, 150x132 The new Slic3r 1.2 allows for the input of arbitrary print areas so you can allow for easy layouts without worrying if it can print orby nicholas.seward - Polar Machines, SCARA, Robot Arms
Wish I could help. You will have to do some experimentation along with examining his math to figure out his intent. Just go slow and take your time. It will come.by nicholas.seward - Polar Machines, SCARA, Robot Arms
I just checked ttsalo's code and the Armstrong is functionally the same as yours. You will just have to tweak the parameters.by nicholas.seward - Polar Machines, SCARA, Robot Arms
I was trying to work up the inverse kinematics. I got a very very long expression. (There is an arctan, a sqrt along with 20 multiplications and 8 add/sub. That is only for one side.) Maybe, I did it wrong. Has anyone else worked this out. I was hoping to rough out a preprocessor so Evil Monkey could do some testing. As it stands now with the huge expression, I could fit the Wally transforby nicholas.seward - Polar Machines, SCARA, Robot Arms