by nophead, published
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If the rod is bent and you constrain the top then for the carriage not to be displaced the coupling at the bottom would need to be able to displace radially rather than just bend. If the top end is free to wobble it has no effect on the carriage so preventing it from wobbling is detrimental not beneficial.
Your design is very good, but I am looking for solution wich is more simple regarding assembly process and have less dependencies (motor, coupler with flexible insert). In case of hanging Z, you have only put bearings and connect any flexible coupler - commertial one made of alloy, printed or just made from flexible tube.
All true with assumption that you have quite solid coupler at the bottom. My concept is base on "floating" threaded rod - as flexible coupler as possible, rood with some clearance between the ball bearing internal hole. At the end you have no wobbling, and adventages I have mentioned before.
This is the 8mm rod version with NEMA17 motors, T5 belts
and an acrylic frame.
The source files and STLs for other sizes are on Github here: github.com/nophead/Mendel90. There are also bills of materials for each sub assembly, so you can see which parts go where.
Detailed instructions will be on the RepRap wiki soon.
I have built this version, but not run it yet. The "Sturdy" version has been running for three Months.
The base sheet is designed to be 10mm acrylic and the rest of the frame 6mm.
and one of all the other STL files.
Vitamins.txt lists all the other mechanical parts.
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