Here is my LED version of Cricket Phaser I designed before. One part is printed in RED HD_GLASS (see stl file name), one is printed in BLACK PLA, one in CLEAR PLA and rest you can paint in any colour and/or paint it after.
Inside there is a space for 4 LED (connected in series), 3 x White LED for the transparent red part and one Green LED for clear part. All is powered by 12V battery (A23) in holder and switched by a push button (Rapid part no 78-0055).
This model requires a bit of patience to put together, but I'm really happy with my little cute cricket phaser :D
Please note that all the parts fit perfectly in the Fusion 360, but as you probably know it's not necessary the case in real life printing. I would recommend to scale red transparent and clear part by 99-98% but it all depends on how good is your printer calibrated.