Hi... here are the weight figures:
Non-Moving, original: steel rods 6/420 mm (2 x 94 g) = 188 g
Non-Moving, modified: 300 mm rail (90 g), fasteners (36 g) = 126 g
Moving, original: printed carriage, 2 bushings and magnet = 19.5 g
Moving: modified: linear carriage, printed adapter plate and magnet = 21,5 g
So this nets a substantial decrease in non-moving and, luckily, only a slight increase in moving weight.
You may have noticed that I left the original steel rods in place for added rigidity (even glued them into the printed parts at the bottom) because rigidity of the tower assembly is not quite satisfactory anyway, at least with my 3DR. To check, position the nozzle somewhere close to the bed, grip the 3DR at the top, rock it in all directions and watch the nozzle move about quite a bit horizontally! This doesn't seem much of a problem with low to moderate printing speeds but WILL decrease print quality when trying to print faster (and with high acceleration, as required to mask the extrusion elasticity introduced by the bowden extruder).
>> But why did you use that in this setup? Just to test or is there other reasons ? <<
All things considered, I don't think this is a must-have modification, because I got only a slight improvement in print quality from it. But, as you said, it was for testing, to get rid of the remaining slack of the linear bushings, and to gain some experience with this type of linear guide (DIN standard 9 mm size MR 9NM by taiwanese manufacturer CPC, 60 Euros each here in Germany) for my next printer projects.
How's your 3DR doing? Have you found points and/or solutions for improvements? I still would like to increase frame stiffness, but have no idea how to get real improvements without a major redesign. The main flex appears to be in the top & bottom printed parts.
Non-Moving, original: steel rods 6/420 mm (2 x 94 g) = 188 g
Non-Moving, modified: 300 mm rail (90 g), fasteners (36 g) = 126 g
Moving, original: printed carriage, 2 bushings and magnet = 19.5 g
Moving: modified: linear carriage, printed adapter plate and magnet = 21,5 g
So this nets a substantial decrease in non-moving and, luckily, only a slight increase in moving weight.
You may have noticed that I left the original steel rods in place for added rigidity (even glued them into the printed parts at the bottom) because rigidity of the tower assembly is not quite satisfactory anyway, at least with my 3DR. To check, position the nozzle somewhere close to the bed, grip the 3DR at the top, rock it in all directions and watch the nozzle move about quite a bit horizontally! This doesn't seem much of a problem with low to moderate printing speeds but WILL decrease print quality when trying to print faster (and with high acceleration, as required to mask the extrusion elasticity introduced by the bowden extruder).
>> But why did you use that in this setup? Just to test or is there other reasons ? <<
All things considered, I don't think this is a must-have modification, because I got only a slight improvement in print quality from it. But, as you said, it was for testing, to get rid of the remaining slack of the linear bushings, and to gain some experience with this type of linear guide (DIN standard 9 mm size MR 9NM by taiwanese manufacturer CPC, 60 Euros each here in Germany) for my next printer projects.
How's your 3DR doing? Have you found points and/or solutions for improvements? I still would like to increase frame stiffness, but have no idea how to get real improvements without a major redesign. The main flex appears to be in the top & bottom printed parts.