Twimster V2 Foam Dart Blaster SCAR Barrel

thingiverse

SCAR (String Centering And Rifling) barrel for high velocity toy foam dart blasters. Designed for 5/8" OD dart barrel (i.e. Lynx, Caliburn/Talon Claw, etc.) but can be edited and adapted to other blasters. Features: - Simple, self-centering and self-tensioning clamping nut. - Very little hardware required - only fishing line and 4 printed parts. - Lightweight and compact design. - Fully adjustable tensioning and strong rotation locking system. This design has undergone successful gameplay testing, after one day game and one duel. I find it less likely to jam than my other SCAR barrels so far. (R-SCAR and 13mm Turbine.) Parts required: - 3D printer - Fishing line of appropriate thickness. I'm using 0.45mm rated for 40lbs. I do not know the lower nor upper limits, and simply went for a balance between strength and cost while being reasonably usable to work with. - Optional: Whatever tools you need to pass string with and/or tie knots with. How to String: I recommend going in a typical "wave" pattern and using the string locks on the side to secure each loop. Tie the ends and secure them against the holes. (Might illustrate this later.) I had to add an extra knot at one end in order to tension it properly, but might consider alternative solutions later on. (Or you can use superglue to help secure one of the ends, I suppose.) The string should be at least 2.5 or 3 feet or so - you can start feeding it and adjust later if you aren't sure. Leave enough slack to tie the knots at the ends, and work through the tensioning after tying the first knot. Of course, when stringing, you should only be working with the Body and Rotator parts. When done and adjusted to your liking from dart fit, screw on the Cap to secure the Rotator in place. After that, place the Adapter on your barrel and screw the remaining assembly onto it until locked down. You may need to loose the barrel from the blaster first to avoid problems/damage to the mounting system. Ensure proper string tension. Without twisting, you should have a loose dart fit in the strings. After tensioning, there should be just enough to twist the dart around, but it should still be a very easy push fit. Improper tensioning will likely cause jams or other issues. Current State of Development: - First gameplay tests successful, predominantly with AFPros and Max darts. - Stringing and basic firing testing were successful. Only a few darts were tested (Worker, AFPro, and the notorious miss-broadside-of-a-barn Sweet Orange), did not get to test much variety. - Some durability improvements (increased thicknesses) have been implemented and await testing. - Thread spacing has been improved. - Known issues: > O-ring groove is untested, although it's an entirely optional feature. The idea is to prevent even more air from backflowing out that area, to help the airflow push through any potential jams. Other notes: Will be testing on the Lynx and Caliburnoid platforms (Mainly C2 and Recalibrator - see my designs.) Designed for .509" aluminum tube barrel from Online Metals but should work with any 5/8" OD dart barrel. Designed to be printable with larger nozzles and/or lower resolution printing - tested on 0.72mm line width and 0.32mm layer height. Should be printable in just about any common filament. I recommend: - ABS: Will be lightweight and cost-effective. - PETG: Will be stronger and cost-effective. Have not tested other filaments, but advanced 3D870 resins (i.e. HTPLA+) are of interest, as are nylon, polycarb, and other polymers out of my budget lol. PLA is not recommended due to how easily the parts warp. Future design update considerations: - Durable-ization: While earlier designs were optimized for less plastic usage, the current version has been thickened in key areas to improve durability. Further testing will be done to determine any additional changes that may be needed. A thick/heavy version is being considered. - Aesthetic changes: TBD.