These are 9 high-quality test pieces of mine. They don't meet my high expectations but too good to just throw away. They all have 14mm ccw threads and fit well as shown in the pictures.

Set consists of: 5 copper, 3 silver, and 1 gold. All printed in silk pla at a 0.1mm layer height and weigh 30g each. Each amplifier took 8+ hours to print. I also normally sell perfected ones at £20 each

Price includes postage.