Nominal dimensions( Overall size 103.368x103.368x76.339 in mm units. The internal hole has diameter 44.34 mm. The min thickness is around 2 mm). Before printing, remember to scale up or down according to your target bulb housing size etc. If you liked the design and successfully printed it, then please contribute to my account to continue making interesting content available to everybody for free. Use any glue for plastics to assmble the buld housing and the printed decor piece together. I'm an Additive Manufacturing & Design Engineer with 6+ years field experience. Contact me today if you need design and / or 3D printing services. Thanks