Assistive Technology Adapted Dice Roller

A switch enabled assembly that I am working on to enable people with limited abilities to "throw" some dice. Still a work in progress, current BOM:

Part Cost Source Details
Clear Plastic Cup Free recycle can ;) Need lip diameter for base flange
Base $1.59 3d print (53 grams) For flange diameter of dixie cup
Rotating Disc $0.57 3d print (19 grams) For flange diameter of dixie cup
Battery Holder $0.40 https://www.amazon.com/TrendBox-Battery-Plastic-Storage-Container/dp/B0713MJ76K/ref=sr_1_2?ie=UTF8&qid=1519074761&sr=8-2&keywords=2xaaa+battery+holder 2xAAA bulk order qty:20 for $8
DC Hobby Motor $2.40 https://smile.amazon.com/gp/product/B01N4G8DSO/ref=ox_sc_act_title_2?smid=A12HJ1QDTAZB16&psc=1 bulk order qty: 5 for $11.99
608 Skate Bearing $0.30 https://www.amazon.com/608-2RS-Skateboard-Bearing-8x22x7-Sealed/dp/B0045F7FJ0/ref=sr_1_7?ie=UTF8&qid=1519074925&sr=8-7&keywords=608+bearing bulk order qty:100 for $29.95
3.5mm Stereo Jack $0.75 https://www.adafruit.com/product/3692 Pane