#prusawire #prusa #voron *This procedure is a composite of initial advice from @ellafoxo, @thenomad, and @safe from the Positron Discord.* *Compatibility: Prusawire - Beta 1* ## Overview The gantry de-racking procedure is critical to ensure smooth motion in X and Z. The general idea is to loosen certain screws on the gantry, bump the bottom of the gantry against the X and Z motor joints to align, and tighten the screws. ==The adjustment can and should be repeated after belting the printer. (check with Nomad?)== ## Prerequisites - Confirm your frame geometry is square: [Frame Assembly - Geometry Check| Prusa Knowledge Base](https://help.prusa3d.com/guide/2-frame-assembly_427481#427929) - The following should be assembled already: - Frame - Z-Axis - X-Gantry with toolhead mount - You should be ready to belt both the X and Z axis. ## Instructions 1. Remove the **toolhead** from the **carriage mount** (if currently installed). 1. For Stealthburner, see the Stealthburner assembly manual for instructions. 2. Remove the **bed**, **y-carriage**, and **y-rods** completely off the printer (if currently installed). 3. Remove the **bumper block** and **door puller block** from the back of the gantry (if currently installed). ![[readyforderacking.png|300]] 4. Remove the **top left idler assembly** and **top right idler assembly** loosening the M3 SHCS on each. 1. *TIP: A small piece of tape on the top and bottom of the assembly can be used to help keep the bearing stack together.* ![[topidler-1.png|300]]![[topidler_2.png|300]] 5. Remove the **x-gantry assembly from the printer** by lifting it up off the z-axis rods. 6. Loosen all six **M5 BHCS** from each side of the x-gantry assembly. ![[xgantry-m5screws.png|500]] 7. Ensure each end of the 2020 extrusion is seated ALL the way into the printed parts. 8. Re-install the **x-gantry assembly** onto the printer by sliding it onto the z-axis rods from the top. 9. Move the **x-gantry assembly** up and down a few times to allow parts to settle. 10. Lower the **x-gantry assembly** until it bumps against the X and Z motor mounts. ![[gantry-installedloose.png|300]] 11. Tighten the two top M5 BHCS on the x-gantry assembly, followed by the two front M5 BHCS. ![[xgantry-fronttop-tighten.png|500]] 12. Raise the **x-gantry assembly** up to the top just high enough to be able to tighten the rear two M5 BHCS. ![[xgantry-rear-tighten.png|500]] 13. Lower the **x-gantry assembly** back down to the bottom. 14. Re-install the **top left idler assembly** and **top right idler assembly** by tightening the two M3 SHCS on each. 15. Re-install the **bumper block** and **door puller block** on the rear of the gantry. 16. Move the gantry up and down. You shouldn't feel any resistance. ![[final.gif|500]] 1. When the gantry bumps the top of the frame, it should bump equally on both sides. ![[topbump.png|500]] 2. When the gantry bumps the bottom (X motor mount and Z motor mount), it should bump equally on both sides. ![[bottombump.png|500]]