Stepcraft CNC tool adapter
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Publicado:2026-03-13 18:54:28
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These adapters fit the Stepcraft spindle bracket and will hold a
- 7mm spring loaded diamond tip engraver tool.
- Dial indicator
- 3mm (1/8") engraving tips
- 12mm linear bearing for a 12mm collet chuck extension that will hold various engraving bits
My spring loaded drag bit tool is from ebay and seemed good value for money and well designed but doesn't need to use the spindle, the tool doesn't turn. https://www.ebay.ca/itm/SPRING-LOADED-PCD-DIAMOND-DRAG-ENGRAVING-TOOL-CNC/142851020584
I made my own spring loaded bit by using a linear bearing and a collet extension, now I can add all kinds of bits, mainly those really cheap carbide tips for other engravers but also a proper diamond tipped stone setting tool that is really tough (to set a grindstone).
I also attach my cheap ebay digital dial indicator when checking how flat the surface that I want to engrave is.
Stepcraft do sell Aluminium adapters from 43mm to 20 and 20 to 8 etc but not one for 43 to 7mm that I need. I don't have the means to make a metal version so I printed this one.
I've engraved acrylic, steel, brass, glass and textured glass and the adapters seem rigid enough.
These are very simple adapters to design and you can readily adapt it to your own tools. I have bought low cost Dremel tools like the 9929 bit or carbide point BIDE tungsten steel engraving bits.
Print Settings
Printer Brand:
Creality
Printer:
Ender 3 Pro
Rafts:
No
Supports:
No
Resolution:
0.16
Infill:
40%
Filament: AMZ PLA Blue
Notes:
I used 40% infill and don't think any more would help improve the rigity.
I increased the wall thickness to 2mm for the same reason and because the hole will need to be cleaned out.Post-Printing
Cleanup
The first layer spreading effect will partially fill the slot, it won't clamp evenly if you don't clean the top out. I used a scrollsaw blade and ran it to the narrow end of the slot, a hacksaw blade will work just as well.
I cleaned the edge of the hole with a deburring tool but a file or countersinking bit would work just as well.
My printed part hole diameter was slightly smaller then 7mm, I was OK with that because I could clean the hole out with the file to fit exactly 7mm
To ensure the inside of the hole had even sides I cleared it with a round file (chainsaw sharpening file), you really want even clamping of the tool along its length. A 7mm or 9/32nd drill can be pulled through the hole by hand, drilled slowly once inserted or used as a file. Just clean the hole out evenly.
How I Designed This
Design
The OD is 43mm as fits the bracket in the CNC. The bracket is only 13mm thick but I made the adapters a bit longer to help with rigidity.
The slot that allows the clamping has a round end to reduce stress but this is likely not necessary for a printed part, doesn't harm to add it.
It will clamp to 0.35mm less than the hole diameter, if the slot is cleaned out properly.
If the adapter is loose, add a wrap of aluminium duct tape or similar to the OD to increase the diameter slightly.
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