MPR&P-V3... a Mostly-Printed Rack&Pinion CNC Machine
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This is version 3 of the MPR&P 3-axis CNC machine. It is highly modular, consisting of both linear and lift stages.
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This is version 3 of the MPR&P 3-axis CNC machine. It is highly modular - comprised of three near-identical linear stages and two identical lift stages. This version of the MPR&P is a completely original design but was heavily inspired by V1Engineering's popular LowRider4 "beam and lift" setup.... which has repeatedly demonstrated outstanding rigidity for a DIY machine. This design has also been openly developed in a thread on the V1Engineering forum, found here:
https://forum.v1e.com/t/mpr-p-v3-triangular-beam-can-you-help-make-it-go/54260
It consists of both printed parts and common hardware that is both inexpensive and readily available from local sources or online... no expensive or hard-to-get specialty parts are required.
Unique to this machine are printed herringbone rack-and-pinion (R&P) for all axis, XYZ. The racks are made up of easily printable rack segments that are strung together on 1/4" threaded rod for the linear stages and are used to set the length of an axis to most any practical length. The printed rack and pinion parts in the lift stages are also printed but bolted to the lift plates with 4mm machine screws... and are also mirrored. The lift plates that capture the ends of the gantry beam are also mirrored. The left and right end supports on the linear stages for Y are the remaining mirrored parts.
The other fastening hardware consists of 5/16" (8mm) hex bolts of varying lengths up to 5" from the big-box store and an assortment of M3, M4, and M6 machine screws and nuts. NEMA17 stepper motors, suitable wire, lever wire connectors, and a Jackpot 3 and FluidNC from V1Engineering are highly recommended... though most any GRBL, FluidNC, or grblHAL controller can be used to control the machine... easily found online from various places, including Amazon.
The "narrow" core parts are for those interested in a narrower X-carriage more suitable to laser/pen/drag-knife use... lighter loads. The Z-lift assembly will fit either the wide or narrow wrap-around core parts.
Note that all "core" parts rely on 5" bolts to adjust the "clamping force" to bring all roller bearings into contact with the axis' triangular rails. Don't over-do and bind... adjust carefully for smooth operation without binding.