UFO Pipe

This is a Unidentified Flying Smoking Apparatus. Top hole is for a 14mm slide but it is sized at 15mm. This has not yet been printed so any prints and uploads or construction tips would be appreciated. At 100mm diameter you have your fire close to your face, 150 i think is optimal and larger than 200 is if you can have it laying around to show off and such, just make sure to adjust the Slide's hole size.