Cable Chain Remix for Pro Operation Remix

This is a small change to the "Cable Chain Remix for Pro Operation" model. The original ones had 5mm holes, which were too tight to freely spin an M5 bolt, which means you can't tighten them properly against your square or T-nuts. They also were solid all the way through, and thus required a weird size M5 I couldn't find. 25mm was too short, 30 was too long, and the stores around me don't carry intermediate sizes.

I just modified the original models expanding the bolt hole to 5.5mm, and added a 10.25mm inset hole 15.5mm into them, so there's a 4.5mm bit of plastic for the bolt to hold into, but the 10mm bolts that are used for everything else on D-Bot and derived printers fit with these. Otherwise they're identical.