Nerf - WSPR Homemade

thingiverse

CHANGE NOTE 12/21/19 - Backstrap and TguardW now install without screws. CHANGE NOTE 09/02/19 - MuzzleW front sight blade added. CHANGE NOTE 08/52/19 - BirdPad added. CHANGE NOTE 08/22/19 - Plunger now prints in two parts with a ring-grip. The catch surface prints smooth since it's against the buildplate. Both parts need to be deburred prior to use, and textured buildplates require sanding before use. CHANGE NOTE 08/20/19 - SearW stiffening and PlungerW catch profile tweak. CHANGE NOTE 08/18/19 - Sear profile tweak (again) and interior tweaks to CapW. CHANGE NOTE 08/16/19 - Sear profile tweak (again), Plunger catch surface change, Trigger change. CHANGE NOTE 08/14/19 - Sear profile tweak. CHANGE NOTE 08/12/19 - MuzzleW2 added for those who want to experiment with longer barrels. CHANGE NOTE 08/10/19 - Increased airflow in CapW, Tguard tweaks, Trigger profile, Backstrap length. CHANGE NOTE 08/10/19 - Everything changed. INSTRUCTIONS: http://captainslug.com/nerf/WSPRAssembly.pdf A strange experiment in extreme simplification, inspired by the "DCiT" homemade series. The WSPR (Wiggle Stick Plunger Retention) puts the sear inside the plunger tube to reduce part count and material costs significantly. The elastic allows for expedient adjustments to spring load, and the sear length can be adjusted to provide various plunger stroke distances. The sear sticks out of the print that caps the top of the plunger tube, sealed off by a toggle switch boot. This allows the trigger to interact directly with the sear. Two last project goals achieved are: 120mm build plate compatibility and being able to print every part at the same time on a 150mm buildplate (print time between 6 and 8 hours). Material list 1. 4" length of 1-1/2" OD x 1-3/8" ID Polycarbonate tubing (plunger tube) 2. 3" length of 5/8" OD x 1/2" ID PETG Tubing (barrel) 3. 27" cut-then-tied loop of 1/8" elastic cord 4. One short pin (1/16" x 3/4") 5. Three Dash 123 O-Rings 6. Twelve 4-40 x 3/8" flat head screws 7. M12 toggle switch boot This one may require finer print settings than prior designs due to needing to print an M12 thread. I had good results at 150 micron layer height. If the tread doesn't print well, they may need to be filed off so the toggle switch booth can simply be glued on. Hardware sets are for sale in my Etsy shop https://www.etsy.com/listing/728006909