Update on the XY Joints - Gantry

We've already discussed resolving the issues we have with the SLM MGN12H XY joints.

I've made numerous changes behind the scenes over the last month:

• New print orientation for less warping (Adeo's idea)
• Single-piece design for better alignment
• Bearing retainer screws from the outside, just like on the sheet metal design
• Much smoother features, more suitable for SLM

If these changes don't improve things significantly, I think I'll give up on the idea of MGN12H XY joint with such a tight belt path. If it does work out well, I'm open to diving into this deeper to make it smoother/better.