Yeethammer 36/40mm tube (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!)

Changed some clearance and tolerance of the parts to fit 36/40mm plunger tube, and the metric HW list by PotatoFeederNerf.