These are replacement brackets for Slot 1 motherboards.

Modeled after IBM brackets, but modified for my particular use case. All Slot 1 CPUs fit, but only SECC CPUs (the original Pentium 2 cartridges) will be properly supported and locked. I fix them in place with screws and bolts. I will add a second, universal, bracket later on if no one remixes this one.

I printed prototypes in PLA, they are pretty sturdy. ASA or ABS recommended (including post-processing with acetone vapor, if you can keep dimensional consistency).