Yeethammer Ống 36/40mm (Metric)

As it was hard to source the parts needed for the Yeethammer here in EU (Sweden in my case) I had to do some remixing for it to fit an acrylic plunger tube of 36mm inner diameter and 40mm outer diameter from Amazon, cut to 145mm. However, a polycarbonate or aluminum tube is preferred (like this one), as acrylic is brittle.

Remixed parts

plunger-head-100-36mm-ID
- Increased diameter from 29.5mm to 30.1mm to fit the metric O-rings suggested in the original "Yeethammer Metric" spreadsheet (From PotatoFeederNerf Etsy page) 

plunger-tube-priming-block-100-40mm-OD
- Increased clearance for the 40mm tube to fit.

body-pt-guide-fore-40mm-OD
- Increased clearance for the 40mm tube to slide freely.

body-pt-guide-aft-40mm-OD
- Increased clearance for the 40mm tube to slide freely.

135mm-spring-spacer
- Additional part, for using a 135mm spring. The spring I used might be a bit hard, but it works.

Hardware

I used the below parts from www.rs-online.com (https://se.rs-online.com/web/ for me in Sweden), according to PotatoFeederNerf's metric BOM (except for the 36/40 tube).

2.5mm Diameter Plain Steel Parallel Dowel Pin 20mm Long
Art no: 270-546
(2 pins required)

RS PRO Alloy Steel Compression Spring, 135mm x 27mm, 1.23N/mm
Art no: 121-292
(1 spring required)

/!\ Note, this spring might be too stiff, I broke my plunger tube while reloading, i will try to reinforce the front mount (plunger-tube-priming-block-100_40mm-od_V2.stl)

RS PRO Nitrile Rubber O-Ring O-Ring, 29.5mm Bore, 35.5mm Outer Diameter
Art no: 196-5039
(3 rings required)

RS PRO Nitrile Rubber O-Ring O-Ring, 16mm Bore, 19mm Outer Diameter
Art no : 196-5485
(2 rings required)

It might be easier buying a licensed hardware kit from PotatoFeederNerf,  as you will end of with lots of hardware in bulk going my way. I did not want to risk the hassle of import duties and delays from Singapore.

Important!

Please also use the M5 threaded rod remix found here, by @kenny_j_2229157

Print instructions

Use the instructions from the original model. The parts have been oriented in their printing position just as in the original model.

Updates

2024-08-04

• body-pt-guide-aft +fore: Lowered diameter on  from 41mm to 40.3mm for less wobble of the plunger tube while reloading. 
• Shell holder published.
• plunger-tube-priming-block-100_40mm-od_V2.stl added, with more reinforcement around the acrylic tube as mine cracked right at the front while reloading (Not tested yet!)