@Whosa_whatsis @ThantiK looking at these macro shots do you think it’s that big an issue for @Brook_Drumm and team? It will be interesting to see how it holds up to millions of changes on the X axis.
It’s probably right on the edge of being OK. They need obround bend relief on the edges of that part, instead of the hole in the middle (in my opinion). A proper forming tool with a wider inside bend radius would also help. (This is the optimal thing to do) – If this is the worst of it though, they’re still doing excellent.
try it to unbend 
Thats not good ;-(
Not at all!!! If you unbend it, you could broke the piece.
Let’s ust say that I’m glad these guys don’t make airplane parts. As far as I can see, there is absolutely no need to make that bend so sharp. But let us not forget this printer is in it’s early stages. I’m sure they will keep making it better all the time. They’d better be.
The piece is definitely a LOT more stressed than it should be. Like @Rien_Stouten says, it’s a good thing it’s not an airplane part (that’s the kind of thing that would make you never want to fly again).
For this purpose the back-and-forth stress on it should be minimal as long as the belt path is properly linear and the bearings don’t seize up, so that the belt tension remains constant. As designed, the part kind of acts as a (stiff) spring WRT the tension on the belt, and I’d be more comfortable with it if the motor mount bent over and down from the top rather than from the end. It will probably survive, at least long enough for the printer it’s a part of to become obsolete, but as @ThantiK mentioned, @Brook_Drumm really needs to use the proper tools to do this in production.
@Mark_MARKSE_Emery s piece is an early bird. My piece looks good. 
That metal is way thicker than it needs to be…
@Camerin_hahn It’s aluminum, not steel. I wouldn’t make it much thinner for its purpose.
I would use sheet steel, but that is me…
This is most likely because it’s done on a hand break. If it was to be done via stamping, the results may be different since you can implement a radius more easily.
This is a prototype made by us at PrintrBot to get out an early version. All the production pieces are made in steel by s great company who specializes in laser cut steel bent on Cnc press brakes. This piece is not an example of production versions.
Brook
It makes sense that the production part is fabricated from steel, not aluminium.
Steel is one of the rare materials that actually tends to get stronger when it is bent, whereas aluminium tends to fracture under the same stress that strengthens steel.
Bend a nail and you will find that it is very hard to undo that bend. The bent area has become the strongest part of the nail.
Aluminium is used in aeroplanes because it is much lighter than steel for a given strength. But Printrbots don’t fly yet ;-).
It is the strength and rigidity of its steel structure that attracted me to the Printrbot Simple Metal in the first place.
I just asked a stress engineer (my wife) "ooh, that’s bad ".
Way too much stretching at the bend, and looks like crack initiation is already starting.
@Mark_Fuller yepp bend radius was to small for the given Material and its thickness.
But i think it will most likely not fail, the forces here are not really strong
This was an early release Printrbot Play sent for FREE- including shipping to UK - to help us improve our build instructions. We made a late change to this particular part so it didn’t arrive in time to ship it. To get the test build kits out the door, we made some in aluminum on our water jet as we didn’t have steel on hand. It served its purpose and the instructions got much better thanks to all the help from the community. Mark does a great job with his documentation and photos! Thanks for the help, Mark!
Brook
You’re welcome! Great bit of kit. Must drop offline and get one with some image editing…
@Brook_Drumm , we aren’t attacking you here - more of a heads up; that’s why we tagged you. 
Agreed @ThantiK , we’re all trying to help in one way or another.
It made me think of a quote from the late Randy Pausch. “When you’re screwing up and nobody says anything to you anymore, that means they’ve given up on you.” We’re all learning, expect us to say plenty stuff
His last lecture “Achieving Your Childhood Dreams” is a good watch if you’ve got an hour+ free.