Promega Z-Belt Tensioning Rail Foot

thingiverse

This rail foot is designed specifically for use with M3D's Promega 3D Printer, a completely open source platform. These feet give highly granular, metal-to-metal adjustability to your 4 Z-Belts' Tension. Use of these on any machine is at your own risk, and it may be possible to over tension the belts with the 10mm of adjustability in the rail. Do not do this. I have them installed on my machine as of posting and have tested them on several prints with great success. So, why should you take any risk at all? The Promega's stock belt driven Z-belt system can develop a bit of 'play' or ‘slop’ in it over time, and keeping your belts tightly secured allows you to maintain the best accuracy in Z-movement. These feet enable you to do that without flipping the machine on its side by using a knob on the inside. These may also prove helpful for bed leveling, but it’s not advisable to under or over tension your belts to get bed level. Special credit and shout out to two M3D discord users who inspired this design – Talrynn(John) and Predundant - both of whom modeled/released designs to the community, inspiring this reworked and combined version. If there is any individual who feels as if they have not given proper credit, or who wishes a different name/link be given, message me directly and I will work to remedy it ASAP. Other Compatible Z-System Mods: Replacing the mechanical Endstop with the Optical Endstop (available on the M3D GitHub from user Shadowhawk) is a highly suggested upgrade that can be used in tandem with these feet, and thanks to earlier input from discord user theBum - this rail foot also has a wire channel on the bottom. It is also very much worth getting theBum’s Z-fin slider for use with the Optical Endstop on your back right rail (available for download with Talrynn's Rail Foot below). As mentioned above, this mod may be helpful in leveling the bed, but its purpose is to keep your belts tight and increase homing reliability. A modified version of C4’s Adjustable Z-Sliders may be used in conjunction with these feet – but the originals (as of 1/13/2019) leave a screw sticking out of the bottom that would ram into the top of these rail feet. If you do use them make sure the screw does not stick out of the bottom! (try the Remix available at the link below). Links: Shadowhawks Optical Endstop https://github.com/PrintM3D/Promega/tree/devel/addons/ShadowHawk/Optical%20Z%20Endstop Talrynn's Rail Foot and Fin slider https://www.thingiverse.com/thing:3052677/files Flat Bottomed Adjustable Z-Sliders https://www.thingiverse.com/thing:3349785 If you run into issues trying to install/use this upgrade/modification, feel free to contact me at tirelessirony@gmail.com, on Thingiverse as tirelessirony, or on the M3D Discord channel also under the username tirelessirony. If you appreciate this design and guide, consider donating via Paypal to tirelessirony@gmail.com and/or to anyone of the fine users mentioned throughout. Such as, but not limited to: - Discord User Predundant who designed the Swivel locking mechanism/slidelock rail shape (a.k.a. Dave Long, Thingiverse: supinemonkey - https://www.thingiverse.com/supinemonkey/about) - Discord User Talyrrn(John) who designed a rail foot secured to the bottom via Screws/modeled the belt teeth (a.k.a John Mueller, Thingiverse: jwmueller - https://www.thingiverse.com/jwmueller/about) --- The rest of the information/guide on print setting, finishing and installation instructions is available for download in the instruction document included. Cheers!