Lumen PNP linear rail mods

prusaprinters

<p><strong>NOTE</strong>: This is for <strong>V2</strong> of the LumenPnP. If you have a V3 or want to upgrade your V2 to a V3, go to the <a href="https://www.printables.com/model/278803-lumenpnp-linear-rail-mods-v3">V3 mod</a>.</p><p>&nbsp;</p><p>Minimalist parts required to convert the LumenPnP from v-slot rollers to linear rails. This preserves the overall dimensions and travel of the machine, as well as maintaining the existing Z-height.</p><p><br>Requires:</p><ul><li>2x 550mm MGN12H rails</li><li>1x 500mm MGN12H rails</li><li>2x x-gantry-block-mount</li><li>2x y-gantry-block-mount</li><li>2x y-gantry (or y-gantry-with-limit-switch)</li><li>1x x-gantry-back</li><li>2x <a href="https://www.thingiverse.com/thing:2804412">MGN12 alignment block</a></li><li>A handful of M3 drop in T-nuts (like <a href="https://www.ratrig.com/hardware2/openbuilds/nuts-spacers-washers/drop-in-tee-nut-m3.html">these</a> or <a href="https://www.amazon.com/dp/B08144SBGQ?psc=1&amp;ref=ppx_yo2ov_dt_b_product_details">these</a>)</li><li>A handful of M3x8mm bolts for the T-nuts.</li><li>12x M3x10mm bolts for the rail carriages.</li><li>A few M5 bolts and nuts (sorry, I haven't had a chance to check the exact bolts needed yet)</li></ul><p>Instructions:</p><ol><li>Remove your existing X and Y gantries.&nbsp;</li><li>Using the alignment blocks, M3x8mm bolts, and T-nuts, attach the 550mm rails to the top of the Y axis extrusions. Place T-nuts along the rail, every 3 holes is fine.</li><li>Using M3x10mm bolts, attach the y-gantry-block-mount to each rail's carriage.</li><li>Insert the X axis extrusion into the ends of the y gantries, don't bolt them down yet.</li><li>Sit the X axis assembly with the Y gantries on top of the block mounts.</li><li>Use a short M5 bolt to secure the Y gantries to the block mounts. The holes in the block mount are designed so the bolts self-thread. Make sure the bolt is not so long that it scrapes the top of the linear rail- use a nut as a spacer if you need to.</li><li>Complete the Y gantry assembly as per the normal instructions. Secure the X axis extrusion, attach the Y axis belts, and mount the X motor.</li><li>Using the alignment blocks, M3x8mm bolts, and t-nuts, attach the 500mm rail to the top of the X axis extrusion.</li><li>Attach one of the X gantry block mounts to the rail carriage using the M3x10mm bolts, with the <strong>flat side up</strong>.</li><li>Using relatively short M5 bolts, screw the front of the X gantry into the block mount using the two existing holes that were previously used to hold the wheels. The X gantry block mount is designed so that the M5 bolts self-thread into them.</li><li>Attach the second X gantry mounting block to the X gantry underneath the extrusion, using the two slotted holes that were previously used to hold the wheels.</li><li>Attach the X gantry back to the X gantry mounting blocks using four M5 bolts on the other side.</li><li>Finish the X gantry assembly as per the normal instructions.</li></ol><p>&nbsp;</p><p>After completing the build steps, <strong>you need to update your calibration in OpenPNP</strong>. While this mod attempts to keep the Z-height the same, it does end up a mm or so different.&nbsp;</p><ol><li>Jog the head over to the datum board and re-focus the top camera.</li><li>Re-calibrate your top camera's mm/pixel.</li><li>Re-calibrate the Z-height for the primary (and secondary, if applicable) fiducials.</li><li>Update the Z-height on <strong>all feeders, tool changer locations, and board locations</strong>. If you don't, you risk the head crashing into things.</li></ol>