Hello, this is one of my current project, i'm actually facing some probleme with my 3d printer so i didn't print all the pieces right now but when it's done i will post corrected files and some photo and video. All the file now should print very good. without support I post solidworks 2014 piecesFor this pretty cool robot you need some time to print i think i can print all the pieces ihn something like 30hours. You need: 4 6v dc motor 25mm with 75:1 or 34:1 reduction (http://www.pololu.com/product/1575) 4x whell, i use this ( http://www.pololu.com/product/1558) with adaptator. You will also need some shock absorber, i use 80mm shock absorber (something like this http://www.ebay.com/itm/RC4WD-Dual-Rate-Double-Spring-80mm-Aluminum-Scale-Shocks-Crawler-Scaler-Z-D0039-/281260664624) And a good motor controller i used a saberthooth 2x12a with an rc system In printed part you need 4 motor support 2 front 1 base center 2 piecearedecouper1 2 piecearedecouper2 2 spacer For a good finish just bolt something like an aluminium plate on the spacer all the thing are hold with m2.5 screw