---
title: Drill injection + relief holes
slug: drill-injection--relief-holes
step: 6
howto: make-plaster-moulds-for-large-products
tags: ["product","injection","extrusion","mould"]
category: Moulds
difficulty: Medium
time: < 1 week
location: 
---
# Step 6: Drill injection + relief holes
Prepare the mold for your machine by clamping its parts together to ensure proper alignment. A large hole is required to connect to the extruder machine.

Additional smaller holes are necessary in various locations to serve as indicators that the plastic has reached certain points, and they also help to prevent pressure build-up.
![IMG_3667 copy.jpg](/resources/howtos/make-plaster-moulds-for-large-products/img_3667_copy.jpg)
![IMG_3677 copy.jpg](/resources/howtos/make-plaster-moulds-for-large-products/img_3677_copy.jpg)