As I've produced a few upgrades, I'll post them here rather than have people search for them
Filament cooler duct - https://www.thingiverse.com/thing:4584870
Static X guides - https://www.thingiverse.com/thing:4577513
Z guides - https://www.thingiverse.com/thing:4580455
XZ guide - https://www.thingiverse.com/thing:4570666
1" angle iron *snert*