First Documented Successful 3D Printed Revolver (&c.)
Washbear. This is an early version with tension bars (in red on the cylinder, retained by the cylinder’s black end caps).
Big News: Working 3DP Revolver
Proof of firing video:
What you just saw was a 3D printed, legal, double-action-only revolver firing six shots of live ball ammunition. This is the culmination of a lot of effort by a lot of people, not least Yoshitomo Imura who is doing three years in an unpleasant Japanese slammer for firing blanks from his original design. Through many iterations, 3D revolver and pepperbox design has improved until it’s reached the current state of the art, which is called the PM522 Washbear.
FOSSCAD writes:
The PM522 Washbear DAO .22LR Revolver by James R. Patrick. AFTER YEARS OF TRIAL AND ERROR we have the WORLD’s FIRST 3DPRINTED DAO (Double Action Only) Revolver!!!!!!!! WOO HOOOOOOOOOOOOO! With the body of the Songbird Pistol and an Imura-esque Cylinder and trigger system, this baby hold 6 dataloving shots of 22LR made for consistent shooting with a removable cylinder for easy reload. OH YES WE CAN!!!!!!! We are refining the recipe and will be releasing CAD VERY SOON! For now we have a lovely test video proving that this baby works!!MOARGUNS!!
Washbear in its case. Cylinder is designed to be an expendable part.
Patrick is an engineering student; his own site is purported to be here. However, access is blocked by our antivirus software: “Access has been blocked as the threat Mal/HTMLGen-A has been found on this website.” We were able to view the text on the site by looking at the Google cache of the site.
Cylinders in particular received a lot of trial, error, and trial again. The initial cylinder design took 20 hours of printer time to produce. (Who was the wag that called this technology “rapid prototyping,” and where can we get a case of whatever he was drinking?). Another iteration (see the green cylinder in the upper left) used the 3D printed part as an outer shell and filled it with epoxy resin; this is the “fill compositing” technique developed by Belter and Dollar at Yale and published in PLOS ONE.
Design for the resin-filled cylinder.
Best one so far has metal chamber liners. Here’s what Patrick says:
Here’s a summary of the different cylinders we’ve tried:
- The original multi-part cylinder with tension rods didn’t hold up. It fired two shots and cracked on the third, which deformed the cylinder enough to jam the action. The tension rods actually sheared cleanly at the point where the bullet exits the casing.
- So we tried making the tension rods thicker. On that version, the tension rods survived firing but the cylinder still cracked.
- So then we tried my resin-filled ABS idea. That one fired six shots, but was too damaged to reuse.
- So I made a version with no tension rods and I tightened up the headspace, hoping that the front and rear of the cylinder would contact the frame when fired and the frame would take the pressure. FP has printed this version in Taulman Bridge (a nylon filament) and it awaits testing. He also modified that design to accept steel chamber liners.
It was printed on a Rostock Max, a deltabot-style open-source printer that’s popular with hobbysists for its open-source nature, large print area, and reasonable cost.
Washbear frame printed on the Rostock Max.
Much more information at the IMGUR page, and in Patrick’s website, if he can get it de-malware’d. Anybody’s guess what government agency did it to him?