I was in two minds about whether to use AutoCad Inventor or Solidworks. By a quick 5 minute investigation they both seem to do about the same thing (AutoCad can do a loft extrusion like Solidworks so it would be fairly trivial to create the same object in AutoCad too).
The reason I chose OpenSCAD for my turret design before was that it didn't take me any time at all to learn it since it's all effectively a C like language (which I use every day anyway at work).
A CAD modelling app has a bit more of a learning curve to it and since I won't be designing models every day, I'll forget how to use it in a couple of weeks so would need to go through the learning curve several times over whenever I need to use it.
I'm quite tempted to stump up £3000 for a FormLabs Form1 printer when they're available in February, and if I do I'll probably be making more and more stuff
For the moment I'll carry on getting stuff printed using an agency - I've already printed around 20 bushnell turrets for people. Adam Lee suggested making some trigger blades - ABS might be quite a nice material to use for trigger blades because it's not as cold in the winter.
Anyhoo.. I'll keep having a play, I know there are some professional CAD experts on here so any tips would be greatly appreciated.
Oh, this Wegu spacer printed by the agency will probably cost around £11 plus VAT + postage.. so 1 would probably cost about £20 (printing 1 item isn't very cost effective). But I reckon I could probably print a fully adjustable ABS butt hook for about £25, which isn't bad considering how much you'd pay for one from Intershoot.