April 11, 2026
Description
This is the blaster I designed when I wished I had a Big Greg. It is Grew, the Greg we have at home.
It is a low hardware magfed bolt-action MXL stringer blaster
Goal was to be able to DIY it for under 70$ including hardware and filament.
Can be tuned from HvZ levels up to 200fps, depending of the version you choose to print :
- 1 loop of 4mm TBD (HvZ version - using short barrel)
- 3/16" or 5mm TBD (HvZ version)
- 2 loops of 4mm TBD (HvZ version - using short barrel)
- 2 loops of 4mm TBD (HvZ version)
- 1/4" or 6mm = K25 TBD (HvZ version)
- 3 loops of 4mm = K25 TBD (HvZ version)
- 3/8" or 9,5mm = K14 TBD (HvZ version)
- 4 loops of 4mm = K14 TBD (HvZ version)
- 1/4" or 6mm = K25 TBD (Long Draw version)
- 3/8" or 9,5mm = K14 170fps (Long Draw version)
- 1/2" or 13mm = K12 + K31 200+fps (Long Draw double-bolt version)
It is compatible with Evan's Full Length MXL mags.
ATTENTION : Please read the instructions in the .txt files as it needs specific slicer settings to ensure no zipping sound when priming and a good dart flow.
Using the 3mf files is strongly recommended.
Hardware required :
- 10ft of elastic string
- 2 strands of 1/8" (3mm) elastic string or hair band
- 3.5kg of PLA
- 50g of TPU
- Lube (generic silicone oil works)
- CA glue
Tools required :
- Cutter to remove brim
- Sandpaper to remove flashing
- Pointy flat head screwdriver or metal pick to remove flush pins for disassembly.
- Pliers to help remove pins
Special thanks to :
Evan for the Big Greg inspiration to shoot big darts powerfully
Sillybutts for the LHTCU inspiration to print a barrel
gargunkle for the Frayed Knot inspiration to convert to a plungered stringer
Bruce LeedleLeedleLeedleLee for the Anemone inspiration to print a PT and o-rings
The build process is the same as for Woose, so follow this build guide :
License:
Creative Commons — Attribution — Noncommercial — Share Alike
Dalardan
