foxkit
commented
9 years ago The Rostock delta printer is a simplification of the Stewart Platform. I've been working with DIY Stewart platforms for many years.
The general Stewart Platform has six legs, each of which can be moved independently. The resulting motion has six degrees of freedom, and can position in X, Y , Z, but also in roll, pitch, and yaw.
The Rostock simplification binds these legs into two pairs with a special geometry (legs in a pair that are strictly parallel). Only three actuators are required, one per leg pair. What is lost is the three degrees of freedom for roll, pitch, and yaw.
I don't think it is possible to tilt the platform.
If we built a delta machine as a full Stewart Platform with 6 steppers, we could tilt the platform.
-- Carl
I'm still working on my build, but I have an idea for easy dual extrusion.
Problem: Support and Model nozzles need to be perfectly level, but one might interfere with the other's printed material. Stratasys solution: solenoid on support end that raises/lowers it relative to the model nozzle level. *Rostock solution: Mount each nozzle 2º off perpendicular. When printing, tilt the platform a +/- 4º to switch which nozzle is perpendicular to build.
This could all be done in software. I don't know the code well make this change, but I can help beta test.
PS, I am also planning on using the "Lift Z" retraction setting in Slic3r to easily hop over printed areas to further eliminate the nozzle dragging plastic around.