BF20 Mill Spindle Spacer Casting Mold (Epoxy Granite / Resin Concrete)
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A printable casting mold designed to create a high-damping spindle spacer for the BF20 mill. Fill it with epoxy granite
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Model information
- Source
- Printables
- Category
- Mechanical Parts
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
Overview
This project offers an alternative to expensive solid metal spacers. By using a 3D-printed shell as a permanent or removable mold for Epoxy Granite (Resin Marble), you can create a component with high mass and excellent thermal stability.
I originally sourced this spindle (1.5kW 110V air-cooled) for a Milo V2 build, but decided to adapt it to my BF20.
Technical Details
Compatibility: BF20 / G0704 class mills.
Spindle Type: Standard AliExpress 1.5kW 110V air-cooled spindle.
Mounting: Designed for 8x M6 nuts to secure the spindle to the block.
Cost Efficiency: Specifically designed to circumvent the high cost of raw aluminum/steel blocks in Japan.
Benefits of Epoxy Granite
Vibration Dampening: Far superior to solid aluminum, leading to better surface finishes and longer tool life.
Economy: Filling a printed shell with resin and aggregate is a fraction of the cost of a CNC-machined metal block.
Precision: Allows for complex internal geometries and pre-aligned bolt holes without heavy manual machining.
⚠ Status: Design Stage
Please Note: This project is currently in the Design and Prototyping phase. It has not yet been printed or cast. I am sharing this early to gather feedback from the community regarding structural rigidity, resin-to-aggregate ratios, and casting techniques.
Design Feedback Welcome
If you have experience with epoxy granite casting or BF20 conversions, I would love to hear your thoughts on:
Optimal resin/stone ratios for this volume.
Suggestions for internal reinforcement (rebar or mesh).
Leveling and tramming strategies after the pour.