Bergmann Simplex Prop

Updated
V3 now has improved fit and function.  The mags have been simplified and now are just props. Several areas have been slightly tweaked for better fit/printing.

Overview:
The Bergmann Simplex was a compact firearm produced in the early 1900s, utilizing innovations from the earlier Bergman Model 1896 pistol, as well as the Mars pistol. It was chambered for the proprietary Bergmann-Simplex 8mm cartridge.

Info:
I've always wanted a Bergmann Simplex, but the price always had other ideas.  Since there was only 4,000 of them made, I decided the easiest way to get one was to make it.

This is a fully interactable Prop firearm.  Modelled as accurately as possible on the real late model Bergmann Simplex.  The trigger, magazine, bolt, and ejector all work.  I had to take some liberties with the magazine well and I simplified the trigger for ease of printing.

The closet modern day equivalent to the same cartridge is the 32 acp or 7.62 browning.  It cannot fire it and does not have any firing pin.  If you modify the design to fire it, you will have a bad day. And I am not responsible for that.

Technical Details:
You will need some M3 bolts preferably M3x 12.   Any spring 3/8 or smaller in diameter should work.

I made the tolerances pretty tight so you might need to file or sand some parts and or drill. The bolt has a slot in it for a compression spring.  I recommend it be at least 3 inches.  Some super glue may be required on the rear sight retainer and on the back of the extractor. I have a plug for the back of the bolt that can be glued in to give the hammer something to hit against.

Assembly:
Step 1:  Test fit all parts and make sure no sanding or drilling is needed.  Use a M3 tap if preferred.  
Step 2:  Start with the trigger.  Slide it in from the rear. Then attach it with a M3 bolt.  Then slide the spring in behind the trigger. Use something to push the spring onto the shelf in the frame.
Step 3:  Squeeze the trigger and slide the hammer with its spring into the slot in the frame. Release the trigger and push the hammer down to align with the pin hole. Slide in the pin and secure it with a M3 bolt.  Some super glue may be needed on the pin.
Step 4:  Slide in the safety,  test it in both positions.  It should rotate 90 degrees, one way allows the trigger to be squeezed while the other doesn't.  Secure with a m3 bolt.
Step 5:  Assemble the bolt.  Glue in the ejector catch.  Slide in a suitable spring from the rear.  Glue in the retainer plug.  Pull the hammer back and slide the bolt in all the way forward.  
Step 6:  From the top use a small stick or a piece of extra filament to push the spring forward toward the barrel. Slide the rear sight into the gap created.  The spring can then be released and should be resting on the rear sight.  
Step 7:  Take the mag catch and use an M3 bolt and nut to secure it to the front.  Ensure a suitable spring is in place before securing.  Test with a magazine.

Originally this was based on the Simplex in Handgun History - A 3D Tour by danlovy. But the model was not accurate enough for my liking.  But this is modified, so much so that the only thing still remaining the same is the grip and even that has some different sizes and chamfers.

I have printed the frame with the barrel vertical and a slight tilt, and it came out fine. but then again my printer is really good with supports.