In order to make sure that your non-standard lightsaber blade works with your lightsaber hilt, you need to look at: blade socket diameter and blade socket length. The blade socket diameter should match the diameter of the lightsaber blade you would ordinarily use with your lightsaber hilt (1 inch diameter blades and 7/8 inch diameter blades are the most common). You should also tailor the blade socket length to your hilt. If your lightsaber hilt has windows in the emitter, for example, you may want a longer blade socket on your non-standard lightsaber blade.
Looking for a non-standard blade for your lightsaber hilt? Here are few companies to consider. Flat acrylic lightsaber blades are among the more popular non-standard lightsaber blades currently available.
Flat Acylic Lightsaber Blades
RipperBlades.net (also Ripper Blades etsy store)
Ripper Blades is known for their acrylic lightsaber blades, but they sell a variety of cylindrical polycarbonate blades as well.
LuxSabers etsy store (based in France)
LuxSabers primary sells flat acrylic lightsaber blades, but also sells a Corran Horn custom lightsaber.
ACLightabers etsy store (based in Malaysia)
ACLightsabers primarily sells budget lightsabers, but their store features some flat acrylic lightsaber blades as well.
Custom Darksaber Lightsaber Blade [THIS IS AN AFFILIATE LINK]
Flat acrylic lightsaber blade from eBay seller nginejnky87
Miscellaneous Non-standard Lightsaber Blades
SaberForge Lightsaber Light Whip (from SaberForge etsy store)
SaberForge Berserker Axe Blade Set (from SaberForge etsy store)
SaberForge Crusades Axe Blade Set (from SaberForge etsy store)
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Do you own any Ripper Blades or any non-standard lightsaber blades?