Covered 5-layer BCAR

Update 8/24/22: Uploaded new version of everything. Bearings are now centered on their flanges instead of their bodies, which better reflects which parts are in contact with the darts and improves accuracy. Vents have been made larger and a different shape. Collet Nut is now knurled. Cover updated to accommodate changes to base.


This is a 3-print, 5-layer (15 bearing) Progressive-angle BCAR for foam blasters. The bearings are tilted at 3/6/9/12/15 degrees at each level to smoothly bring the dart up to its rotational velocity. There are vents near the base to allow excess pressure to escape without fishtailing the darts.

The original idea was to allow a BCAR attachment to be printed such that the tip could be orange (for safety or legal reasons) while the rest of the body could be another color. Of course, if orange tips aren't needed for your use case, feel free to print all the parts in the same color.

The cover should do a decent job of keeping dust/pet hair/etc. out of y