There are a total of 9 3d printed parts, designed in 123D. FULL LIST OF MATERIALS (with aprox. costs): - 2x MTB Wolverine motors ($16) - http://outofdarts.etsy.com - Geared motor $10 - https://www.amazon.com/gp/product/B01FJMFUSU/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1 (Faster ROF) - https://www.amazon.com/gp/product/B01BBSXDJ4/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1 (Slower ROF) - 3x round button switch $3 https://www.amazon.com/gp/product/B00F4MFM3O/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 - 35mm EDF fan $25 - http://www.hobbyking.com/hobbyking/store/__17145__EDF35_with_11000kv_Motor_Assembled.html - Brushless ESC $20 - http://www.ebay.com/itm/Vgoodrc-Firefly-30A-LITE-OPTO-6S-ESC-32-bit-PWM-One-Shot125-42-for-RC-Quadcopter-/311686307874?hash=item4891f3a022:g:ce4AAOSwM4xXazt- - Arduino Nano processor $4-20 (or cheaper if you buy generic) - https://www.amazon.com/gp/product/B015MGHH6Q/ref=od_aui_detailpages00?ie=UTF8&psc=1 - USB step down power (Use this for arduino board longevity/heat) - https://www.amazon.com/gp/product/B018JWCX8M/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1 - 16 AWG wire $2 - Local hardware store - 1000MAH Graphene battery 65C $10 - http://www.hobbyking.com/hobbyking/store/__91173__Turnigy_Graphene_1000mAh_4S_65C_Lipo_Pack_w_XT60.html - XT60 connector $1 - http://www.hobbyking.com/hobbyking/store/__10414__Male_XT60_Connectors_5pcs_bag_GENUINE.html - M3 hex bolt and nut $.50 - Local hardware store - 2x Resistor - https://www.amazon.com/gp/product/B00EV2QYCG/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1 - Select fire switch (coming in later build) - https://www.amazon.com/gp/product/B00XVR3G5K/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1