I had some problems with these being too fragile, so I beefed them up a little bit. Then I used FormFutura ApolloX ASA filament and these seem very strong now. I used a raft when printing, but it might not be necessary. I also increased the wall thickness to make these pretty much solid when I printed them. 250 nozzle and 90 for the bed. Supports are required, and I recommend turning down the percent for the support to make it easier to remove without breaking the part.