MPCNC Primo Nema17 drag chain mounts

prusaprinters

<p>Drag chain mount for MPCNC Primo, remixed from thing <a href="https://www.thingiverse.com/thing:4613811">https://www.thingiverse.com/thing:4613811</a>. I chose to attach the drag chains directly to the Nema17 steppers with a design that straps around the motor and kept in tension with a screw.</p><p>The drag chains i used are Sunhokey 15x20mm, purchased from https://www.amazon.com/gp/product/B07MJPBV4Y. I needed four of them since i have a larger machine (3x5' footprint).</p><p>For the drag chain from the gantry, I used a simple aluminum angle to give the drag chain some support to rest on (it's ok if it's only on one side). This was inspired by <a href="https://www.thingiverse.com/thing:4635424">https://www.thingiverse.com/thing:4635424</a> but created from scratch for my application.</p><p>Update April 16, 2021: added J and F size clamps.</p><h3> </h3><h3>Print Settings</h3><p><strong>Printer Brand: </strong>Prusa</p><p><strong>Printer: </strong>I3 MK3S</p><p><strong>Rafts: </strong>No</p><p><strong>Supports: </strong>No</p><p><strong>Resolution: </strong>0.2mm layer height</p><p><strong>Infill: </strong>20%</p><p><strong>Filament: </strong>Prusament PETG Black</p><p> </p><h3>Post-Printing</h3><p>In my setup, i have three drag chains.</p><p>The first drag chain is on the left, attached to the motor using part nema17-mount-yleft.stl, and leading to the rear left of the machine. This drag chain has all motor and endstop cables for the y-travel direction. The cables from the right-hand-size motor are routed inside the pipe to the motor truck on the left.</p><p>The second drag chain is connected to the gantry motor using nema17-mount-gantry.stl, and is angled and elongated in order to meet up with the drag chain support underneath. This drag chain contains the z-axis wires, endstop, and could also have your router/laser/probe wires if you want to.</p><p>This drag chain rests on a narrow aluminum extrusion (15x10mm) which is mounted to truck_clamp_c_primo_raised.stl and truck_clamp_c_primo_plate-small.stl on the front the machine, and parts truck_clamp_c_primo_raised.stl and truck_clamp_c_primo_plate-large to the rear of the machine. The drag chain is screwed to truck_clamp_c_primo_plate-large using an m3 bolt and nut.</p><p>The third drag chain is in the rear, attached to the read x motor using part nema17-mount-xrear.stl. This is a mirror of the nema17-mount-yleft part. This drag chain has the x-motor wiring and endstops, as well as the wires from the gantry, and leads to the rear left of the machine.</p><p> </p><p> </p><p> </p>