Compact Lightweight Bracket

My entry for this challenge is a "Compact Lightweight Bracket", mainly designed for manufacturing with the method of injection moulding, using three sliders for reducing material. Draft angles are partially modeled with. First of all, my target was to realize a compact part - with a more or less equal wall thickness - to reach a result, without getting a higher, than the maximum permitted mass. I think, that my model can manufactured with a 3D-Printer too. Notes: Modeled with »PTC Creo Parametric 2.0« FEM-Analysis done with »PTC Creo Simulate 2.0« Specifications: Material: Ultem 9085 Specific Gravity: 1.34 g/cm^3 Maximum permissible mass of part: 45,36 g Mechanical values for FEM-Simulation: Force in (-Z)-Direction: 600 lbf Material Strength Allowable: 4500 PSI Young's Modulus: 325 KSI Poissons Ratio: 0.41 Properties of 3D-Model: Mass and volume of the updated model (definitive values): Mass: 0,04531 kg = 45,31 g Volume: 33,81 cm^3 Results of FEM-Simulation: Max. displacement: 0,21 mm Max. stress von mises: see added "screenshots" (permissible values exceeded in some very, very small and complete uncritical areas) Please don't forget to have a look at the interesting two alternative fastening possibilities, whereby one solution is for increasing the stability, using two threaded bolts and nuts. Both methods are shown with some renderings. Model available in (.stp)-format, (.stl)-format. The native format (.prt) has been "zipped" to » bracket_v1_1.prt.1.zip «