X-Tension for Prusa-i3

thingiverse

This holds the pulley for the x-belt. In the original design, with rods only stuck in, most of the tension was directed over the z-bearings, z-rods, and frame. This presses directly onto the x-rods, which have a blind-hole on the other end. "Connected by shape" rather than "- - force". Originally it was designed for a self-printed pulley on 2 HDD-bearings. I went back to the 4mm rimmed bearings, so I had to file .3mm off of the contact area. If you also need 8mm but don't want to change it in the .dwg, just stretch the x-axis to 105% and file off at least .1mm. The holes are a bit bigger than standard for metric-thread-forming. So it should be possible to screw them into the part directly after printing. Additional parts: 2 M8x30 (exact length to be measured on your printer) (Maybe 2 small pieces of rubber or plastic, so the rods don't corrode where they come in contact with other metals. Maybe also filing the tips of the screws straight.) 1 M3x15 / M3x16 All preferably stainless. Bearings and/or pulleys. P.S.: Can anyone tell me the correct English words for "kraftschlüssig/formschlüssig"? Some manufacturers advise you to use bearings for diameters over 40mm (63 teeth). In my experience, they suffice down to 20 teeth, and below that pulleys are that imprecise (especially self-printed ones), that you are still better off with a plain old bearing. (I'm always using ^2 & ^3, since my keyboard doesn't have keys for ^1 or ^4) And do not print those pulleys. Maybe I will re-design it one day myself since it was designed for a 17 teeth-pulley, and the bearings have a diameter equivalent to 20 teeth.