hi! thank you so much for this guide! I purchased the 3d printed impeller from shape ways and it fit beautifully! I'm still having issues with the grinder though- it will now grind through once at whatever volume I have it set at, but then when you try to grind again, it makes a high pitched sound similar to the one it makes when out of beans. If you disassemble and reassemble the burrs, it will do the same thing again- grind through one cycle then stop. Any ideas???