***This is a modification specifically for the Prusa i3 MK3S with a full bear frame.  This modification unlocks an additional 14mm of Z height without the need for longer Z axis parts or additional investment.  This mod has been tested on 1 machine thus far (as of 8/1/19) and the results indicate that there are no losses in print quality or hardware issues otherwise attributable to this design.  The custom firmware that I have provided installs and operates normally.  Please, try at your own risk.

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Update 7/31/19: I'm printing a benchmark at maximum z height right now. As soon as it's done I will install the lowrider mod on my mk3s and load up the custom firmware I just finished (https://drive.google.com/open?id=1CvUE573YDk-4MFuyfOQODluytIZ_yKcc). I will then print the same benchmark, maximized for the new build volume, tonight and upload pictures of the side-by-side first thing tomorrow. Note that the custom firmware includes linear advance 1.5, so it will require recalibration of linear advance 1.0 settings.

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Update 7/31/19: Update: Modified Z-motor mounts have been uploaded to account for x-axis collisions created by the lower bed mount. This modification is still untested so use at your own risk. I am printing these brackets now and will be testing throughout the coming week.

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Update 7/30/19: NOTICE: It has been reported that using this mod will result in multiple collisions, including a collision at the far left (home) position of the x-axis and another at the far right position of the x-axis. These collisions involve the fan duct (on the left) and the pinda (on the right). I am looking into a solution that will include modification of the z-motors mounting brackets. Until said solution is available I do not recommend that anyone install this mod. That being said, I've printed all of the mounting brackets and plan to begin testing the mod within the week.

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This mod is untested, so try at your own risk. All y-rod, motor and pulley mounts have been moved down by 14mm and modified to plane from the bottom of the front/rear extrusions, rather than the top. Custom firmware will be available in the future. This design will be modified (if necessary) for the mk2.5s full bear in the near future.

Note I have included an adjustable y-idler pulley with a 3D printed 20T pulley that utilizes two MR63ZZ L-630 bearings, as well as an m3x12 button-head screw. The standard pulley carriage from the original design (see remixes) should work for users that dont want to build the plastic 20T pulley and use the m3 screw.