This is a J head mount for Ø25mm J head, with adjustable active cooling.
It is designed for a Prusa I3 Pro B.
the maximum build-space, after the upgrate, is 200 x 200 x 186mm.
The linear bearings are 8x15x45mm, distance of the linear axes is 45mm.
40 mm axial fan
30mm axial fan
8x Screws M3x 20 + nuts
4x screws 3,5 x 22
for an adjustable fan mount:
4x Neodymium magnets 5x5x2
Metal foil up to 0.3 mm thick