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I have completely rebuilt the felt Prusa into a linear bearing version and it is much better. I even use the printed y-carriage design with 3 arms. Overall it is a very solid performer. It is currently on loan to a friend who owns a CNC and he has build some CNC'ed parts for my other projects including a couple of different beds out of acrylic for my RepRap Wallace.
I replaced the hand drilled
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PlanoRepRap
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Texas, Dallas RepRap User Group
I know this is an old thread but I completed an Original Prusa + heated bed + ramps 1.4 electronics + .35 Makergear Hot end many months ago and am getting good prints with it. It uses an 18V power supply for the motors, hot end, and bed.
I am still using an older release of Sprinter, PrintRun (pronterface.py), and SFACT. It works so why change it.
I also printed and assembled a larger PLA P
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PlanoRepRap
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Texas, Dallas RepRap User Group
From the video linked below the UP printer does seem to use a tube to hold the filament and a Bowden style extruder.
But you do have a point about extruder accuracy, responsiveness, etc. Pushing a fiber through a tube will always add some "slop" and friction in the system. But how much is too much?
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PlanoRepRap
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General
I am currently sourcing parts for a Prusa Mendel right now. Have everything except belts, motors, and electronics. I'm in Plano, TX just north of Dallas and work in Dallas.
I am also having a little trouble finding assembled or partially assembled electronics here in the USA.
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PlanoRepRap
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Texas, Dallas RepRap User Group