Full crossbracing for Prusa simplified Mendel
Description
Also check: Y motor mount torsion box for Prusa simplified Mendel thingiverse.com/thing:11017
Smooth rod / shaft collar from a drilled out M8 nut thingiverse.com/thing:11068
Selis Mendel features a plywood or acrylic plate there, Prusa Mendel has nothing. I am too lazy to cut plywood right now, so here it is.
Inspired by Lateral support for Prusa by Miro87043 thingiverse.com/thing:14606 , this solution is, I believe, more comprehensive with a full triangulation, while staying out of the way and keeping the filament needs reasonable: about 40 grams for both side pieces, and 28.5 grams for the top assembly.
This part has been thought as an unobtrusive upgrade: no need to dismantle your pyramid amid much fear and loathing, the thing has brackets to bolt it over the existing studding. This comes at the cost of slightly more filament and just a few bolts.
The top part has some residual flexibility along the X axis. This might help with dampening, or not. Alternatively the part can be printed as a box, or massive by editing the dxf and re-exporting the stl from openscad. The code is a huge mess, in a big need of cleanup and parametrization.
Update 20120109: Thanks to thingiverse.com/Justblair 's excellent work, a finalized version has been uploaded (all.stl and the openscad revised files).
Instructions
In addition to the mentioned nuts and bolts, you will need to cut some M8 studding: 1x300 mm, and 2 x 190 mm. Use nylock nuts, cyanoacrylate glue or double nuts.
Somebody should try recording and doing FFT analysis on the vibrations of frames with or without bracing at differents speeds. A microphone or a piezo should be suitable... Empirically, there IS a significant difference.
The side brackets can also be used to cross-brace the machine's base. you will need 2x same side.
Discussion on the reprap forums: forums.reprap.org/read.php?151,112816
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Looks good :-) I printed the plate but had one part come unstuck. Please could you upload the top halves of the side covers separately?
If you add hex nut spacers to the topmost screws you can use any clip-on filament holder. nice.
Thanks Lanthan and Justblair, just printed this and it was a breeze to assemble, no bodging required. Noticable reduction in vibration in x axis direction.
Great minds think alike. I was right in the middle of designing near enough exactly the same object in Openscad when my RSS feed reader alerted me to this design. Looks very good.
Hi! 8-)
We should join forces The code still needs to be made compatible with vanilla configuration.scad (mostly about hole size named variables) so people used to tweak their own stls find familiar ways. Alternatively, we cold use Nophead's polyholes http://hydraraptor.blogspot.co...
for the same purpose...
License
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ehh somehow some of the files (scad and dxf are just opening in a new window in safari, I need to modifiy the files so I can use 3/8 rods all around.
(yeah making a 3/8 mod) anyways just letting peeps know use another browser if your having problems like opera
terramir