I made a mid motor conversion of my B4.2. It started out as a fully printed chassis, but I could never get it durable enough. After many revisions, I ended up making something like my own Centro... go figure.
I've been running it for about 6 months and haven't broken a single part I have made.
The printed parts are PETT (Taulman T-glase), and the aluminum bits (chassis, rear camber plate, and rear bulkhead) are 7075.
After getting sick of breaking stuff in the earlier revisions, I started FEA stress analyzing everything in Solidworks with a 2000 psi limit (and lots of optimizations based on this and all failures stopped. I was really amazed at how much difference the various tapers, etc. made on the printed parts (or any part, for that matter). Sometimes a gram of plastic here or there could reduce a stress hot spot 5:1. I guess with small parts on 1:10 cars, lots of features are stress concentrations! I was also surprised at how much material wasn't needed. There was certainly more material removed in optimization than removed.
15-09-2014
My B4M
Threaded Mode