We had a snow day today so I came in and my students and I got LISA done!
[attachment 22535 firstprints.jpg]
LISA Simpson is together and printing!!!! Above you can see as far as I got on two squirrels. The purple one was using unknown settings. The orange one was Slic3r defaults. (The couplers slipped on both and the filament drive melted during the orange one.) They obviously failed.
Video of first moves!
*The inverse kinematics is all worked out. I will attach my ugly preprocessor if anyone wants to dig in. I was coding to get it done not to make it look pretty or be maintainable.
*I forgot to trim the potentiometers so I was over currenting the steppers. They got hot enough to make the couplers start slipping. I will print new couplers that are a little better and fix the current.
*The 3/8" screw is good enough. I did have one that wobbled due to a a coupler misalignment. That can be fixed with a bigger screw or two bearings at the bottom. I think I will add the extra bearing. It will just be a printed standoff, a bearing, and another thread clamp. I could then technically remove the top thread clamps but it will be better with them.
*The PVC with all thread holding it together is phenomenal. The rigidity is perfect. You can pick the bot up from anything but the screws and move it during printing. Printing upside down or sideways won't be an issue.
*Bed leveling is perfect before calibration. Once I fix all the problems listed above, I want to print something huge.
*Dimensionality it perfect.
*The sleeves I put below the nuts work brilliantly.
*Putting about 5lbf on the extruder only moves it about 1mm. (I didn't measure that is just my guess.)
*Even with wobble in one screw I don't think you will see the artifacts it creates for most prints. It would take a print that was designed to show it.
I am now going to leave this at school and try to get home in the ice so you will have to wait until next week to see a video of it printing.
I will post files soon once the last few bugs are worked out. My question for you guys is... should I convert this to the 7/16" screws that are 2.5 times stiffer before I publish? It will cost $60+ more.
[attachment 22535 firstprints.jpg]
LISA Simpson is together and printing!!!! Above you can see as far as I got on two squirrels. The purple one was using unknown settings. The orange one was Slic3r defaults. (The couplers slipped on both and the filament drive melted during the orange one.) They obviously failed.
Video of first moves!
*The inverse kinematics is all worked out. I will attach my ugly preprocessor if anyone wants to dig in. I was coding to get it done not to make it look pretty or be maintainable.
*I forgot to trim the potentiometers so I was over currenting the steppers. They got hot enough to make the couplers start slipping. I will print new couplers that are a little better and fix the current.
*The 3/8" screw is good enough. I did have one that wobbled due to a a coupler misalignment. That can be fixed with a bigger screw or two bearings at the bottom. I think I will add the extra bearing. It will just be a printed standoff, a bearing, and another thread clamp. I could then technically remove the top thread clamps but it will be better with them.
*The PVC with all thread holding it together is phenomenal. The rigidity is perfect. You can pick the bot up from anything but the screws and move it during printing. Printing upside down or sideways won't be an issue.
*Bed leveling is perfect before calibration. Once I fix all the problems listed above, I want to print something huge.
*Dimensionality it perfect.
*The sleeves I put below the nuts work brilliantly.
*Putting about 5lbf on the extruder only moves it about 1mm. (I didn't measure that is just my guess.)
*Even with wobble in one screw I don't think you will see the artifacts it creates for most prints. It would take a print that was designed to show it.
I am now going to leave this at school and try to get home in the ice so you will have to wait until next week to see a video of it printing.
I will post files soon once the last few bugs are worked out. My question for you guys is... should I convert this to the 7/16" screws that are 2.5 times stiffer before I publish? It will cost $60+ more.
