Depending on your lightsabers design you might have an open barrel plug for charging. it might fit into the overall design. But if it does not, just print a plug to cover it or makes it look like an additional button. In addition it keeps dirt from crawling into the charging port.

You might have to adapt the size to your printers specifications. Fits fine on my MK3, but on my MINI I had to scale it to 98% for a tight fit.

Comes in a few variations. The ‘cone’ versions sink a bit into the plug, while the ‘flat’ version siz … flat on the port.

Just try out a few, each prints in less than 10 minutes.