RB3, RBB3, and RB2 part cooling ducts - bolted fans

thingiverse

These part cooling fan ducts have been upgraded to use bolts for secure attachment instead of the traditional peg and friction fit found in earlier versions. The positioning and tolerancing of the bolt mounting hole has been optimized to accommodate fans with ball bearings, which are slightly taller, and sleeve bearings, which are slightly shorter, as well as either style equipped with a brass insert, commonly found on RB2 models. For use with RB3 and RBB3 printers, including RB1 models, a 22mm M3 bolt and a 3mm nut are required to secure the fan in place. If using fans featuring brass inserts, an M3 x 8mm bolt is necessary for attachment. On Dual head cooling ducts, the left side requires a 22mm M3 bolt to secure a fan with a brass insert securely. As these precision-fit parts demand precise thermal calibration, it's highly recommended to use one of the following two methods: https://www.thingiverse.com/thing:1037301 https://www.thingiverse.com/thing:2502677