Y90 Merge Cutting Jig

An indexing jig for cutting a clean Y-pipe merge. Marking a merge by eye is how you end up with a step on the inside of the joint that kills flow and traps heat. Clamp this on and both legs meet where they should.

You can buy a printed fixture, or you can own the file. Printed jigs are good parts — but they are parts. One size, shipped to you, and when it cracks you order another. This is a file. Print that size as many times as you need, forever, on the machine already in your shop, and print the next size at 11pm the night before a deadline.

What you download

• STL file for the size you choose — or the Bulk Pack with all 14 sizes in one purchase
• 1D centreline radius, 90° merge geometry
• Instant download at checkout. Nothing ships.

Sizes

1.50" (38.1mm) · 1.66" (42.2mm) · 1.75" (44.5mm) · 1.88" (47.8mm) · 2.00" (50.8mm) · 2.15" (54.6mm) · 2.25" (57.2mm) · 2.50" (63.5mm) · 2.75" (69.9mm) · 3.00" (76.2mm) · 3.50" (88.9mm) · 4.00" (101.6mm) · 4.50" (114.3mm) · 5.00" (127mm)

Print settings

My official settings for every G1Pro fixture: 2.5 mm walls, 2.5 mm top and bottom, 20% cubic infill, support-free, printed in Inland PETG-CF. Print one size first and check the fit on your tube.

Licence — Shop Use

Print as many copies as you like for use in your own shop, including on paying customer jobs. You may not share or resell the file, or print copies of the jig to sell. Print-and-sell licences available — ask.

Drawn by James Goertz, G1Pro. Building intake manifolds by hand since 2009; these are the fixtures off my own bench.