Check out Battle Beast Mouse Weapons (3mm, 4mm, 5mm) by TrentTroop on Shapeways and discover more 3D printed products in Toys.
Up in the Shapeways store: Battle Beasts mouse weapons for Powerhouse Mouse and Laser Beast Brain Mouse.: Reproduced with 3mm grips (compatible with the original figures as well as many small figures and building figures, or scaled up with 4mm grips (compatible with MOTU and most 5.5″/6" scale figures) or scaled up with 5mm grips compatible with most Transformers and TMNT figures (among many others)!
All with 3mm barrels compatible with Transformers Siege / Transformers Earth Rise energy effects.














