Originally shared by Nicholas Seward
https://www.youtube.com/watch?v=N7XVxtgHHhY&feature=autoshare
Well done
This is very interesting!
Nice, how much were those lead screws? Steep pitch ones always seem to be non-cheap when I’ve looked in the past.
Nice! What started as an anti-proof of concept, turned into quite an interesting printer.
@Nicholas_Seward , very clever improvements over the normal delta printers. Less parts on the arms. Lead screws replaces rails and belts. PVC stabilizes vertical threaded rods. Very nice!
The way the carriages rotate around the screws as it moves makes it look so much more alive than normal Deltas, though watching it, it strikes me that you could remove the additional calculation (and its odd effect on resolution) for that rotation around the screws by adding a little arm that sticks out of the bottom part of the carriage into a slot in the PVC and allow the base of the effector arm to rotate around that. I momentarily thought it was doing that.
@Hari_Wiguna Those lead screws seem to slow the machine down quite significantly compared to spectra line models. Seems like a pretty big trade-off. But I have to admit, it does look very simple and robust.
The simplicity and availability of the structural elements vs the upgrade in positioning seems like a wise distribution of build budget. It’s amazing to watch an idea spring into actuality like this.
@Mike_Taylor I can make the.machine go much faster. I would guess that I can go about 75% as fast as a Rostock.
What’s the chance the leadscrews will wobble?
@Shane_Graber 1 of the 3 wobble but that is from a misallignment in the coupler but that can be fixed. Also I am bumping up the size of the screws.
@Nicholas_Seward Cool. Would you run into heat issues running the motors at higher speeds?
@Mike_Taylor I am still learning the machine. I suspect I can run at 250+mm/s with cool steppers.
@Nicholas_Seward That looks great and fancy! When one spindle runs the nuts of the others are rotated slightly around the non moving spindles due to the kinematic. Is that compensated or is the effect small enough?
@Karsten_Fuhst It is a huge effect and it is compensated for. 
siehste @Henning_Melles