2 holders designed for Estes Model Rocket Engines sizes A,B,C, and D.

One holder (filename “3 ABC Engine Holder”) has 3 spots for engines.

The other model (filename “2 D Engine Holder”) has 2 spots for D engines.

The model is 60mm x 75mm, with the A,B, and C holder being 11mm tall and the D holder being 14mm tall.

Print Settings:

Walls - 2

Infill - 8%

Brim - If necessary

Supports - No